Search

The design and synthesis of low-cost, excellent catalytic activity catalysts is the key to catalytic oxidation of VOCs. Nanomaterials have attracted great interest in recent years. Here, a simple impregnation method was used to synthesize the Cu-doped CeO2 nanostructure catalyst supported on a boron-rich carbon carrier and applied for the catalytic oxidation of acetone. After trace amounts of Cu were added to the single CeO2 supported on boron-rich carbon catalyst, Cu-doped CeO2 catalyst displayed better catalytic activity. Besides, it also has long-term stability and H2O resistance. The influence of copper doping on the performance of the catalyst was studied by many characterization technologies. The result indicated that the introduction of Cu can further limit the growth of CeO2 grains based on the limited growth of metal nanoparticles on the carrier, can make the amounts of Ce3+ and adsorb oxygen species increase, and can enhance the redox properties of CeO2. Therefore, Cu-doped CeO2 nanostructures in a boron-rich carbon catalyst have the potential for the removal of acetone. [ABSTRACT FROM AUTHOR]

Background: Acetone is a volatile organic compound (VOC) that is often associated with poor air quality. Acetone has chronic toxicity towards humans and has a significant impact on the overall atmospheric air quality. In this study, several layer double oxides (with M2+ = Mg, Ni, Co or Mn and M3+ = Al or Ce) were tested as catalysts for acetone oxidation. Results: MnAl‐LDO was found to be the most efficient catalyst. 50% acetone conversion was achieved at 170 °C (T50%) and 90% conversion at 200 °C (T90%).The incorporation of Ce on MnCeAl‐LDO did not improve its catalytic properties over MnAl‐LDO (the T50% for MnCeAl‐LDO was 12 °C higher than for MnAl‐LDO). The good performance on MnAl‐LDO was due to the presence of Mn3+ and the low reduction temperature. MnAl‐LDO was not affected when water was introduced into the catalytic reaction setup. Less than 5% fluctuation in the acetone conversion rate at 170 and 200 °C was detected in the presence of 5.5% water. The incorporation of Ce on CoCeAl‐LDO improved its catalytic performance over CoAl‐LDO (T50% of CoCeAl‐LDO was 15 °C lower than CoAl‐LDO). Our results showed that the good catalytic performance of CoCeAl‐LDO was ascribed to the increased Co2+/Co3+ ratio and the abundance of lattice oxygen (Olatt). Conclusion: MnAl‐LDO has good catalytic properties for acetone oxidation, even under humid conditions. The LDO catalysts tested here can be developed into efficient catalysts for acetone oxidation and serve as functional materials for the reduction in acetone or VOC emission. © 2018 Society of Chemical Industry [ABSTRACT FROM AUTHOR]

Abstract The MnO x was immobilized on the CoAl mixed oxides (CoAlO) derived from hydrotalcites with various anions (CO 3 2−, Cl−, NO 3 − and SO 4 2−) using the hydration and impregnation methods. The CoAlO oxides modified by KMnO 4 were calcined in air at 300 °C to obtain stable oxides, which could be used as catalysts for VOCs (acetone and ethyl acetate) oxidation. CoAlO with CO 3 2− and 30 h of hydration time (CoAlO-C-Mn-30) exhibited a promising catalytic activity (T 90 = 173 °C for acetone oxidation; T 90 = 175 °C for ethyl acetate), highly superior to CoAlO without KMnO 4 modification. The improvement in acetone and ethyl acetate catalytic oxidation was ascribed to the Co3+ and surface adsorbed oxygen species. The increase of Co3+ in the CoAlO-C-Mn-30 oxide thanked to the self-decomposition of KMnO 4 and reducibility of Co2+ in the CoAlO oxide during the hydration process. This was also confirmed by XRD and XPS characterization, which showed that Mn cations were enriched on the catalyst surface in the valences of +3 and +4. The catalytic activity of the catalyst remained unchanged in four cycles in the presence of 5.5 vol.% water vapor, which indicated a great potential for industrial application. Graphical abstract In this work, the MnO x was immobilized on the CoAl mixed oxides (CoAlO) derived from hydrotalcites and enriched on the CoAlO surface in the valences of +3 and + 4. This rendered more surface Co3+ on the catalyst. The presence of Co3+ improved the low temperature reducibility and surface oxygen species, which are the main contributors for acetone and ethyl acetate oxidation. Image 1 Highlights • MnO x was immobilized on the CoAlO, which thanked to self-decomposition of KMnO 4 and reducibility of Co2+ of the CoAlO. • The catalytic activity of CoAlO and CoAlO-X-Mn was influenced by crystalline structure of the CoAl-X-LDH precursor. • The addition of KMnO 4 enhanced the Co3+ amount and adsorbed oxygen species (Oads) of the CoAlO. • The CoAlO-C-Mn-30 presented an excellent catalytic activity, which was attributed to the abundance Co3+ and Oads. [ABSTRACT FROM AUTHOR]

Catalytic oxidation is one of the most promising methods to remove VOCs. Herein, a zeolite-confined PtMn bimetal catalyst (PtMn 0.2 @ZSM5) was synthesized using a ligand-assisted hydrothermal method, which showed extraordinary catalytic activity with a T 95 of 165 ℃ for the acetone oxidation in the presence of 5 vol% water. Thanks to the zeolite confinement and bimetallic synergy effect, the PtMn 0.2 @ZSM5 exhibited small nanoparticle sizes, abundant acid sites, higher active Pt0 content, and sufficient active oxygen species. These excellent properties promoted the adsorption of VOC, the deep oxidation of VOC, and the desorption of CO 2. In-situ DRIFTS proposed an L-H mechanism for acetone oxidation over PtMn 0.2 @ZSM5. Significantly, the PtMn 0.2 @ZSM5 presented good durability and water resistance under high GHSV conditions. Also, it was confirmed effective for various VOCs oxidation, such as toluene, ethyl acetate, propane, and dichloromethane, showing a promising industrial prospect for eliminating VOCs. [Display omitted] • A zeolite-confined PtMn 0.2 @ZSM5 catalyst was successfully synthesized. • The PtMn 0.2 @ZSM5 showed excellent catalytic performance for VOCs oxidation. • Zeolite confinement effect and Pt-Mn synergy effect was verified to be the keys. • An L-H mechanism for acetone oxidation over PtMn 0.2 @ZSM5 was proposed. [ABSTRACT FROM AUTHOR]

Hierarchical Co 3 O 4 @MnOx material has been synthesized by in-suit growth of MnOx on the Co 3 O 4 and applied in catalytic oxidation of volatile organic compounds (VOCs). Results revealed that T 90 of acetone on the Co 3 O 4 @MnOx was 195 °C, which was 36 °C and 32 °C lower than that on the Co 3 O 4 and MnOx/Co 3 O 4 , respectively. The universality experiments demonstrated that T 90 of ethyl acetate and toluene on the Co 3 O 4 @MnOx were 200 °C and 222 °C, respectively. The above results indicated that Co 3 O 4 @MnOx catalyst presented a robust catalytic performance. Characterization results showed that high catalytic activity of the Co 3 O 4 @MnOx catalyst could be attributed to the improvement of low temperature reducibility, the enhancement of Co3+ and adsorbed oxygen species resulted from the sufficient reaction between MnO 4 − and Co2+ during secondary hydrothermal process. Furthermore, stability and water-resistance experiments showed the Co 3 O 4 @MnOx catalyst with high cycle and long-term stability, satisfied endurability to 5.5–10 vol. % water vapor at 210 °C. Image 1 • Co 3 O 4 @MnOx exhibits an outstanding performance for VOC oxidation. • Plentiful Co3+ species are formed on the Co 3 O 4 @MnOx by the redox reaction between MnO 4 − and Co2+. • Co3+ species are the main active sites of Co 3 O 4 @MnOx for VOC oxidation. [ABSTRACT FROM AUTHOR]

[Display omitted] • CoCr ZIF /Z catalysts for deep oxidation of CVOCs were synthesized by ZIF-derived method. • Introduced CrO x enhances oxidizing and improves acidity. • An increased ratio of Lewis acid to Brønsted acid completely breaks the C–Cl bond. • The metallic interaction of Cr with Co slows down the sintered aggregation of Co 3 O 4 particles. • CoCr ZIF /Z exhibits excellent stability and water resistance in the removal of DCM. The acidic and oxidizing properties of the catalyst are critical for the removal of chlorinated volatile organic compounds (CVOCs). An excellent catalyst often requires outstanding chlorine resistance and byproduct inhibition. In this study, CoO x , which is widely used for the removal of volatile organic compounds (VOCs) because of its outstanding activity was chosen to provide oxidizing properties. To address the potential for chlorination byproducts and the lack of activity, we loaded CoO x on the acidic carrier HZSM-5 by ZIF-derived method, then doped CrO x using impregnation method to enhance both oxidation and acidity. It was found that ZIF-derived method disperse CoO x nicely thus providing more oxidation sites. Besides, CrO x effectively increases the superficial lattice oxygen of the catalyst to compensate for the loss of sites due to the occupation of oxygen vacancies by DCM during the oxidation process. This contributes to the superior oxidizability of the modified catalysts, which explains the high CO 2 selectivity. Invigoratingly, CrO x can increase the ratio of Lewis acid to Brønsted acid to completely break the C–Cl bond, hence eliminating the possibility of chlorine-containing byproducts and accomplishing a deeper degradation of CVOCs. The bimetallic catalysts we prepared have high activity and can achieve very low or even zero byproduct generation. In addition, the catalyst shows outstanding stability and water resistance, which is quite meaningful in the field of catalytic oxidation of CVOCs. [ABSTRACT FROM AUTHOR]

It is a great challenge to stabilize metal species and regulate their catalytic properties at the atomic level. Herein, we reported the Ru subnanometric species encapsulated inside 5-membered rings of ZSM-5 (Ru@Z-2Al). It achieved 90% oxidation of dichloromethane at 350 °C with almost no by-product formation compared with Ru@Z-0Al. The results indicated that the Al sites existed in the zeolite skeleton provided Brønsted acid sites, which promoted the adsorption and activation of dichloromethane and the extraction of chlorine species. Meanwhile, the electronic structure of Ru species was regulated by Ru−O−Al site, enhancing the oxygen activation capacity of the catalyst and the deep oxidation of dichloromethane. Notably, the Ru@Z-2Al remained stable in harsh environments (at 800 ℃ with 10 vol.% H 2 O) due to the double confinement effect of zeolite channels and skeleton Al, which had excellent practical application prospects. Therefore, this study provides insights for designing the high-performance environmental catalytic materials. [Display omitted] • Zeolite-confined Ru subnanometric species was successfully synthesized. • The introduction of aluminum regulates the electronic structure and acidity. • The Ru@Z-2Al performs well in dichloromethane oxidation with no by-products. • The Ru@Z-2Al has excellent stability after treated at 800 ° C with 10 vol% H2O. [ABSTRACT FROM AUTHOR]

[Display omitted] • Simultaneous catalytic oxidation and removal of CO, C 3 H 6 and Soot for diesel exhaust. • Two forms, surface melt out and structural doping, of Ag existing in perovskite. • The surface Ag nanoparticles promote the oxidation of C 3 H 6. • A strong metal support interaction between Co and Ag nanoparticles on the support. To simplify the exhaust treatment process of diesel engine exhaust, the catalytic diesel particle filter (CDPF) was proposed to offer additional oxidation from the diesel oxidation catalyst (DOC). In this work, an oxidative perovskite based compound catalyst Ag 8.0 /LaAg 2.0 CoO 3 doped with Ag+ in the structure and with Ag nanoparticles on the surface, was designed. Both CO and HC can be removed by catalytic oxidation, and the combustion temperature T 50 of soot can also be lowered to 354℃ by adjusting the ratio of NO 2 /NO x. The characterization results and density functional theory calculations show that there is competitive adsorption between C 3 H 6 and CO on the Ag nanoparticle. In addition, it is observed a strong metal-support interaction (SMSI) between the Ag nanoparticles and the Co atoms on the surface of perovskite support, boosting the catalytic activity of NO at low temperatures. We also found that the catalytic oxidation of soot follows the NO 2 assisted oxidation mechanism. [ABSTRACT FROM AUTHOR]

[Display omitted] VOCs and CO are considered to be one of the main factors causing air pollution. They have received widespread attentions due to their toxicity and serious threats to the environment and human health. Catalytic oxidation has been proved to be a promising and effective technology. As an eco-friendly and cheap material, cobalt-based catalysts based on Co 3 O 4 has become the most competitive and potential catalyst material for eliminating VOCs and CO. However, most of the pollutants are complex in composition, such as water vapor, sulfur dioxide, and other substances, which puts higher requirements on the low-temperature activity and stability of the catalysts. This work systematically presents recent advances in treating VOCs and CO with cobalt-based materials to fill this gap. Specifically, this paper focuses on the optimization strategy of activity and stability of cobalt-based materials and discusses the improvement mechanism of catalyst performance in detail. Finally, the challenges and prospects of cobalt-based catalysts in VOCs and CO oxidation were discussed. This work may guide the reasonable construction of catalysts with excellent activity and anti-toxicity for VOCs and CO oxidation. [ABSTRACT FROM AUTHOR]

A series modified Pt catalyst with excellent acetone catalytic oxidation activity and CO 2 selectivity through a relatively low temperature range. • Modified Pt catalyst was prepared for LTCO of acetone. • Excellent catalytic activity and CO 2 selectivity at a low temperature range. • The addition of Ce can promote the formation of more Pt0 (metal) on the support. Low temperature catalytic oxidation (LTCO) is an effective method of treatment for low concentrations of volatile organic compounds (VOCs) that uses efficient catalysts to reduce reaction activation energy and to improve reaction rates. A series of modified Pt catalysts (Pt-Ce, Pt-Zr) were successfully prepared, and they were used as catalysts for acetone oxidation. Several methods such as X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM) and Hydrogen-temperature-programmed reduction (H 2 -TPR) have been used to explore the reaction mechanisms between catalysts and acetone. The results show that Ce-modified Pt catalysts (Pt-Ce/TiO 2) display excellent performance for acetone oxidation, and the T 50 (temperature at 50% conversion rate) and T 90 of Pt-Ce/TiO 2 are 210 °C and 236 °C, respectively. The XPS results show that the amount of Pt0 (metal) in the Pt-Ce/TiO 2 was significantly higher than that in the Pt/TiO 2. The addition of Ce favors the formation of more Pt0 (metal) on the catalyst surface, which accelerates the acetone oxidation. It can be concluded that the additional Pt nanoparticles exposed to the catalyst surface accelerated the process of acetone oxidation. [ABSTRACT FROM AUTHOR]

[Display omitted] • CoMn spinel and Zn-substituted CoMn spinel oxides were fabricated. • Differences in reaction mechanism of acetone and propane oxidation were revealed. • Lattice oxygen activity and oxygen activation capacity promoted acetone deep oxidation. • High valence Mn species facilitated C-H dissociation and C 3 H 7 activation of propane. CoMn spinel (CoMn) and Zn-substituted CoMn spinel (ZnCoMn) oxides were fabricated for revealing mechanism differences in acetone and propane catalytic oxidation. The temperature-conversion profiles, intrinsic reaction rate and activation energy convinced that CoMn and ZnCoMn exhibited high catalytic performance for acetone and propane oxidation, respectively. Experimental and theoretical investigation revealed that deep oxidation determined the acetone conversion, while the degradation of propane was governed by the fracture of C-H bond and subsequently the activation of C 3 H 7. CoMn possessed more active lattice oxygen and superior oxygen activation capacity, allowing acetone to be directly converted into carboxylates without generating aldehydes. ZnCoMn with more high valence Mn species was conductive to the C-H bond dissociation and C 3 H 7 activation. This work revealed the mutual relations between structure–property of the spinel oxides and reactivity of the diverse VOCs, which provided new insights for the rational design of spinel oxides for catalytic oxidation of diverse VOCs. [ABSTRACT FROM AUTHOR]

In order to enhance catalytic performance for acetone, Co-based catalysts prepared under different Co/Al molar ratios and calcination temperatures have been studied in this work. The results indicated that the catalytic activities of the catalysts firstly increased and then decreased with the increase of the Co/Al molar ratio and decreased with the increase of the calcination temperature. Based on the catalytic activities, TG/DTA, XRD, TPR and XPS characterization results, it can be found that catalytic activities of the catalysts with various Co/Al molar ratios were effected by the good crystallization structure of catalyst precursor, surface Co 3+ /Co 2+ molar ratio, low temperature reducibility, and O ads /O latt molar ratio of the catalysts. Meanwhile, the catalytic activities of the catalysts with different calcination temperatures depended on the low temperature reducibility, surface Co 3+ /Co 2+ molar ratio, porous structure and crystallization structure of the catalyst. Among different synthetic composition, 5:1 CoAlO-300 catalyst (T 90%  = 225 °C) and 5:1 CoAlO-200 catalyst (T 90%  = 222 °C) exhibited the efficient acetone oxidation. [ABSTRACT FROM AUTHOR]

[Display omitted] • Catalytic oxidation of acetone and benzene on Pt based catalyst was investigated. • Pt@Z and PtMn@Z catalyst showed opposite activity for VOCs. • Modulating electronic structure of Pt nanoparticles was investigated. • Removal of mixed VOCs was investigated. Revealing the role of Pt electronic structure in the catalytic degradation of VOCs is of great significance for developing efficient catalysts. Herein, the catalytic oxidation of acetone and benzene on the ZSM-5 confined Pt-based catalyst (Pt@Z) was investigated. Surprisingly, after introducing Mn to Pt@Z, the activity of the PtMn@Z catalyst for acetone was significantly increased, while the activity for benzene was decreased. It was found that Mn introduction led to electron transfer to Pt, which enhanced the adsorption of acetone and gaseous oxygen, and promoted acetone degradation. However, the high electron density of Pt inhibited the adsorption and degradation of benzene. Importantly, we used this phenomenon to regulate the electronic structure of Pt by simply adjusting the amount of Mn and achieving the synergistic removal of benzene and acetone. Therefore, this work provided an idea for the design of highly efficient catalytic materials with mixed VOCs. [ABSTRACT FROM AUTHOR]

[Display omitted] • Construction strategies for acidic sites of catalyst are classified and summarized. • The functions of different types of acidic sites in the catalyst are summarized. • The effects of acidic sites in the catalytic degradation of VOCs are outlined. • The future research directions of the acidic site in the VOCs degradation are prospected. Volatile organic compounds (VOCs) emissions seriously endanger human health and the environment, making it the focus of global air pollution control. Catalytic degradation technology possesses the advantage of low energy consumption, a high purification rate, and no secondary pollution. However, catalysts that fully meet industrial requirements have not been developed. Acidity, as a property of catalysts, has played a decisive role in the catalytic oxidation of VOCs, together with the redox property of catalysts. However, a comprehensive and systematic review of the effect of acidity on the catalytic degradation of VOCs is still lacking. In this paper, the construction strategy of acid sites and their roles in the catalytic oxidation of different VOCs are described in detail. In addition, the effect of acidic sites on VOCs adsorption, bond breaking, harmful substances desorption, and promotion of oxidation was summarized. This review provided a reference value for future catalyst design, mechanism analysis, and practical operation. [ABSTRACT FROM AUTHOR]

Volatile organic compounds (VOCs) are considered the culprit of secondary air pollution such as ozone, secondary organic aerosols, and photochemical smog. Among various technologies, catalytic oxidation is considered a promising method for the post-treatment of VOCs. Researchers are sparing no effort to develop novel catalysts to meet the requirements of the catalytic process. Compared with the powdered or granular catalysts, the monolithic catalysts have the advantages of low pressure drop, high utilization of active phases, and excellent mechanical properties. This review summarized the new design of monolithic catalysts (including new preparation methods, new supports, and new energy supply methods) for the post-treatment of VOCs. It addressed the advantages of the new designs in detail, and the scope of applicability for each new monolithic catalyst was also highlighted. Finally, the highly required future development trends of monolithic catalysts for VOCs catalytic oxidation are recommended. We expect this work can inspire and guide researchers from both academic and industrial communities, and help pave the way for breakthroughs in fundamental research and industrial applications in this field. The latest research progress of monolithic catalysts is divided into three parts: new preparation methods, new supports, and new energy supply methods. This manuscript addressed the advantages of these new designs in detail, and the scope of applicability for each new monolithic catalyst was also highlighted. [Display omitted] • The characteristics of the novel monolithic catalysts for VOCs are summarized. • High activity, low cost, and rapid preheating are the targets for the novel monolithic catalysts. • This review focuses on the beneficial effects of every new monolithic catalyst. • The perspectives and future challenges for the monolithic catalysts are proposed. [ABSTRACT FROM AUTHOR]

[Display omitted] • Pt loaded MnNA monolithic catalyst were prepared for the removal of VOCs. • Pt-MnNA-P exhibited the best catalytic performance in the removal of acetone with a T 90 of 220 °C. • Pt-MnNA-P could keep its high catalytic activity for at least 48 h and exhibited excellent water resistance ability. • The reduction of Pt particle size and their high dispersion are the keys to the high activity of the Pt-MnNA-P. For large-scale application, increasing the activity of monolithic catalysts at low temperatures and achieving the high utilization efficiency of noble metal oxides remain formidable challenges. In this study, MnO 2 nanoarrays (MnNA) coated on honeycomb cordierite were prepared, and Pt nanoparticles were loaded on their surface. The probe reaction (oxidation of acetone) was set to explore their catalytic activities. By increasing the dispersion of Pt, the catalytic activity can be further improved with a T 50 of 189 °C and T 90 of 220 °C, which also exhibited water-resistance stability for 42 h. In this paper, the dispersed Pt particles can improve the activity of surface lattice oxygen of MnO 2 nanoarrays, and the possible reaction paths were subsequently discussed. This work offers a direct case for interpreting the catalytic behavior of MnNA coated on honeycomb cordierites, which could potentially promise broader insights into the construction and application of nanoarray structures in environmental engineering. [ABSTRACT FROM AUTHOR]

• 0.01 Pt-20Co/HZSM-5 exhibits excellent DCM catalytic performance. • Co could anchor Pt atoms, thus realizing the single-atom dispersion of Pt. • The formed single-atom Pt increase the oxygen vacancies on the surface of Co 3 O 4. • The synergies of Pt, Co and HZSM-5 is crucial in the catalytic process. The catalytic degradation of chlorinated volatile organic compounds (CVOCs) at low temperatures is a great challenge. In this work, Pt-Co/HZSM-5 ternary catalysts were synthesized and used for the catalytic oxidation of dichloromethane (DCM). By adding only trace amounts of Pt (0.01 wt. %), Pt-Co/HZSM-5 ternary catalyst exhibits better CO 2 yield and lower by-product yield than Co/HZSM-5 catalyst. Besides, it maintained stable activity for at least 45 h without substantial changes. The addition of water vapor to the DCM degradation process on Pt-Co/HZSM-5 ternary catalysts was shown to promote DCM conversion, CO 2 yield, and HCl yield. Catalyst characterization shows that Co (in the form of Co 3 O 4) could effectively anchor Pt atoms, thus realizing the single-atom dispersion of Pt. In turn, the formed single-atom Pt increases the proportion of oxygen vacancies on the surface of Co 3 O 4 , thereby enhancing the redox properties of Co 3 O 4. In the catalytic oxidation process, DCM first adsorbed and dechlorinated on the surface of HZSM-5 due to abundant acid sites and then completely dissociated under the interaction of Pt and Co. Thanks to the synergies of Pt, Co, and HZSM-5, Pt-Co/HZSM-5 exhibited appropriate redox ability, a suitable distribution of acid sites, and sufficient surface adsorbed oxygen, possibly explaining its lower by-product yields and the more efficient formation and desorption of HCl. [ABSTRACT FROM AUTHOR]

The key component of the catalytic oxidation technology is regarded to develop a stable and high activity catalyst. Herein, a series of PdMn/Ti catalysts have been prepared to oxidize acetone. By controlling the Mn amount, Pd dispersion on TiO 2 has been adjusted, which has been confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The X-ray photoelectron spectroscopy (XPS) results show that catalysts possessed more adsorbed oxygen content and an increasing proportion of palladium oxides after introducing manganese with multivalent states. Hydrogen-temperature programmed reduction (H 2 -TPR) shows that the introduction of Mn has improved the low temperature reducibility of the catalyst. Catalytic activities of catalysts with manganese are much higher than that of their counterparts without manganese. Among the prepared catalysts, the Pd 0.01 Mn 0.2 /Ti catalyst exhibited the excellent catalytic activity toward acetone oxidation. The T 95 of acetone is 259 °C under the conditions of 1000 ppm of acetone concentration and 30,000 mL/(g h) of WHSV. The high catalytically activity of the Pd 0.01 Mn 0.2 /Ti catalyst could be ascribed to its good low temperature reducibility and abundant adsorbed oxygen and palladium oxides content. In addition, high valence states of Mn also contributed to the good catalytic activity of the Pd 0.01 Mn 0.2 /Ti catalyst. Unlabelled Image • Pd-based catalysts are modified by a simply and feasible method and applied successfully in acetone oxidation. • Pd-based catalysts with Mn modification have significantly enhanced catalytic activity and CO 2 yield at low temperature. • The high valence of Mn states could contribute to the improved catalytically activity of the Pd-based catalyst. [ABSTRACT FROM AUTHOR]