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283 results on '"Wu, Tianbin"'

54. The in situ study of surface species and structures of oxide-derived copper catalysts for electrochemical CO2 reduction

Author

Chen, Chunjun, primary, Yan, Xupeng, additional, Wu, Yahui, additional, Liu, Shoujie, additional, Sun, Xiaofu, additional, Zhu, Qinggong, additional, Feng, Rongjuan, additional, Wu, Tianbin, additional, Qian, Qingli, additional, Liu, Huizhen, additional, Zheng, Lirong, additional, Zhang, Jing, additional, and Han, Buxing, additional

Published
2021
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56. In situ study of surface species and structure over Oxide-Derived Copper Catalysts for Electrochemical CO2 Reduction

Author

Chen, Chunjun, primary, Yan, Xupeng, additional, Wu, Yahui, additional, Liu, Shoujie, additional, Sun, Xiaofu, additional, Zhu, Qinggong, additional, Feng, Rongjuan, additional, Wu, Tianbin, additional, Qian, Qingli, additional, Liu, Huizhen, additional, Zheng, Lirong, additional, Zhang, Jing, additional, and Han, Buxing, additional

Published
2020
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57. Efficient synthesis of cyclic carbonates from CO2 under ambient conditions over Zn(betaine)2Br2: experimental and theoretical studies.

Author

Ma, Jun, Wu, Yahui, Yan, Xupeng, Chen, Chunjun, Wu, Tianbin, Fan, Honglei, Liu, Zhimin, and Han, Buxing

Abstract

It is very interesting to synthesize high value-added chemicals from CO2 under mild conditions with low energy consumption. Here, we report that a novel catalyst, Zn(betaine)2Br2, can efficiently promote the cycloaddition of CO2 with epoxides to synthesize cyclic carbonates under ambient conditions (30 °C, 1 atm). DFT calculations provide important insights into the mechanism, particularly the unusual synergistic catalytic action of Zn2+, Br− and NR4+, which is the critical factor for the outstanding performance of Zn(betaine)2Br2. The unique features of the catalyst are that it is cheap, green and very easy to prepare. [ABSTRACT FROM AUTHOR]

Published
2022
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58. Tuning the efficiency and product composition for electrocatalytic CO2 reduction to syngas over zinc films by morphology and wettability.

Author

Li, Pengsong, Liu, Jiyuan, Bi, Jiahui, Zhu, Qinggong, Wu, Tianbin, Ma, Jun, Zhang, Farao, Jia, Jinchao, and Han, Buxing

Subjects
WETTING, SYNTHESIS gas, CHARGE transfer, MASS transfer, CONTACT angle, BIOMASS gasification, HYDROGEN evolution reactions
Abstract

Electrochemical reaction of CO2 and water to produce valuable chemicals and fuels is of great importance. Producing syngas with tunable CO/H2 ratios and high current density is an interesting topic. In this work, Zn films with different morphologies and wettability were fabricated. It was demonstrated that Zn films could be used as efficient electrocatalysts for CO2 reduction to syngas and the CO/H2 ratios could be controlled in the range of 0.09–11.4 changing the morphology and wettability of the catalysts and the applied potential. Particularly, using the nanoleaf Zn film with a water contact angle of 91° as the electrode, the current density could reach 90.4 mA cm−2 with a CO/H2 ratio of 1/1 at −1.27 V vs. RHE. In addition, the maximum FE of CO could reach 92.6% with a current density of 35.3 mA cm−2 at a low overpotential of 440 mV. Detailed studies reveal that the three-dimensional electrode architecture and suitable wettability were favorable for CO2/H+ mass transfer and charge transfer, which are important factors for achieving efficiency. [ABSTRACT FROM AUTHOR]

Published
2022
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59. Boosting CO2 electroreduction over Co nanoparticles supported on N,B-co-doped graphitic carbon.

Author

Song, Xinning, Guo, Weiwei, Ma, Xiaodong, Xu, Liang, Tan, Xingxing, Wu, Limin, Jia, Shunhan, Wu, Tianbin, Ma, Jun, Zhang, Farao, Jia, Jinchao, Sun, Xiaofu, and Han, Buxing

Subjects
CATALYSTS, ELECTROCATALYSTS, ELECTROLYTIC reduction, ELECTRON configuration, ELECTRON density, NANOPARTICLES, CARBON
Abstract

Co nanoparticles supported on N,B-co-doped graphitic carbon exhibited efficient electrocatalytic activity towards the transformation of CO2 to CO with a faradaic efficiency of 97.9% and a current density of 18.8 mA cm−2, which is the highest current density at high FE over Co-based catalysts in an H-cell. The ratio of CO to H2 can be adjusted by changing the amount of B doping. The excellent performance of the catalyst is mainly due to its favorable electron density configuration, larger electrochemical surface area, and higher conductivity. [ABSTRACT FROM AUTHOR]

Published
2022
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60. Bromide promoted hydrogenation of CO2 to higher alcohols using Ru–Co homogeneous catalyst† †Electronic supplementary information (ESI) available: GC-MS and GC data. See DOI: 10.1039/c6sc01314g

Author

Cui, Meng, Qian, Qingli, He, Zhenhong, Zhang, Zhaofu, Ma, Jun, Wu, Tianbin, Yang, Guanying, and Han, Buxing

Subjects
Chemistry
Abstract

Higher alcohols can be synthesized efficiently by CO2 hydrogenation over Ru3(CO)12–Co4(CO)12 bimetallic catalyst with bis(triphenylphosphoranylidene)ammonium chloride (PPNCl) as the cocatalyst and LiBr as the promoter., Iodides are commonly used promoters in C2+OH synthesis from CO2/CO hydrogenation. Here we report the highly efficient synthesis of C2+OH from CO2 hydrogenation over a Ru3(CO)12–Co4(CO)12 bimetallic catalyst with bis(triphenylphosphoranylidene)ammonium chloride (PPNCl) as the cocatalyst and LiBr as the promoter. Methanol, ethanol, propanol and isobutanol were formed at milder conditions. The catalytic system had a much better overall performance than those of reported iodide promoted systems because PPNCl and LiBr cooperated very well in accelerating the reaction. LiBr enhanced the activity and PPNCl improved the selectivity, and thus both the activity and selectivity were very high when both of them were used simultaneously. In addition, the catalyst could be reused for at least five cycles without an obvious change of catalytic performance.

Published
2016

66. Synthesis of higher carboxylic acids via reaction of polyols with CO2and H2

Author

Asare Bediako, Bernard Baffour, Qian, Qingli, Wang, Ying, Zhang, Jingjing, Wang, Zhenpeng, Li, Shumu, Liu, Huizhen, Wu, Tianbin, Ge, Maofa, and Han, Buxing

Abstract

Synthesis of value-added chemicals from biomass-derived polyols and CO2is of great importance. Herein we report a strategy to produce higher carboxylic acids by the reaction of polyol, CO2, and H2. The reaction can be efficiently accelerated by Rh catalyst in a binary solvent of ionic liquid (1-butyl-3-methylimidazolium iodide) and water, where cheap and nontoxic I2was used as a promoter. The reaction can occur at above 100°C. At optimal conditions, the yield of the carboxylic acids was as high as 86.4%. The catalytic mechanism is proposed based on a series of control experiments. Interestingly, the polyol could be effectively transformed into olefin intermediate at metal-free and mild conditions, which was the key to the success of this strategy. The peculiar solvent effect was also favorable to the reaction. In addition, the catalytic system was adaptable to various polyol substrates.

Published
2022
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70. Synthesis of Asymmetrical Organic Carbonates Catalyzed by Metal Organic Frameworks

Author

Han Bu-Xing, Liang Shu-Guang, Zhou Yin-Xi, HU Su-Qin, Song Jinliang, Wu Tianbin, Jiang Tao, and Liu Huizhen

Subjects
chemistry.chemical_compound, Chemical engineering, Chemistry, Coordination polymer, Diethyl carbonate, Copolymer, Metal-organic framework, Transesterification, Physical and Theoretical Chemistry, Selectivity, Heterogeneous catalysis, Catalysis
Abstract

Metal organic frameworks (MOFs) are a new class of materials that are formed by the copolymerization of organic ligands with transition metals.Because of their properties such as high surface areas,microporosity,and the ability to tune pore size,many applications have recently been developed in catalysis,separation,and gas storage.We prepared MOFs by three different methods and characterized them with scanning electron microscopy (SEM),X-ray diffraction (XRD),and infrared (IR) spectroscopy.MOFs prepared via the three methods are completely different in morphology and microstructure.We demonstrate that the MOFs prepared via the "direct mixing" method are very effective heterogeneous catalyst for the transesterification of diethyl carbonate with alcohols to prepare organic carbonates.We studied the effects of the amount of MOFs,the reaction time,and the reaction temperature on product yield.Asymmetric organic carbonates can be produced with moderate to high yields and 100% selectivity via the reaction of diethyl carbonate with aromatic,cyclic,heterocyclic,or aliphatic alcohols.The solid catalyst can be recovered simply by centrifugation and reused for at least two cycles.

Published
2010
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79. Catalysis of photooxidation reactions through transformation between Cu2+ and Cu+ in TiO2–Cu–MOF composites.

Author

Chen, Chunjun, Wu, Tianbin, Yang, Dexin, Zhang, Pei, Liu, Huizhen, Yang, Youdi, Yang, Guanying, and Han, Buxing

Subjects
*PHOTOOXIDATION, *TITANIUM dioxide spectra, *STYRENE, *COUPLING reactions (Chemistry), *METAL-organic frameworks
Abstract

Novel porous TiO2@Cu3(BTC)2 composites, which were synthesized using ionic liquids (ILs) as solvents, exhibited excellent activity for photooxidation of styrene to 4-aryl tetralones and promoting the Glaser coupling reaction with O2 under light irradiation. It was discovered that the transformation between Cu2+ and Cu+ was crucial for enhancing the photocatalytic performance. [ABSTRACT FROM AUTHOR]

Published
2018
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87. Efficient Generation of Lactic Acid from Glycerol over a Ru-Zn-CuI/Hydroxyapatite Catalyst.

Author

Jiang, Zhiwei, Zhang, Zhanrong, Wu, Tianbin, Zhang, Pei, Song, Jinliang, Xie, Chao, and Han, Buxing

Subjects
RUTHENIUM catalysts, LACTIC acid, GLYCERIN, HYDROXYAPATITE, BIODIESEL fuels, TEMPERATURE effect
Abstract

The biodiesel production process generates a significant amount of glycerol as a byproduct. A drive to add value has attracted worldwide attention, with the aim of improving the overall effectiveness and profitability of biodiesel production. Herein, we report hydroxyapatite (HAP)-supported Ru-Zn-CuI (Ru-Zn-CuI/HAP) as effective catalysts for the transformation of glycerol to lactic acid (LA).The catalysts were characterized by using different techniques. The effects of catalyst composition, reaction time, and temperature on the conversion and product distribution were investigated. It was revealed that Ru nanoparticles of less than 2 nm were dispersed uniformly on HAP. CuI could effectively inhibit the cleavage of C−C bonds, which led to improved yields of LA. Under optimized conditions, the yield of LA could reach 70.9 % over Ru-Zn-CuI/HAP. Furthermore, the catalyst could be reused at least four times without an obvious loss of activity or selectivity. [ABSTRACT FROM AUTHOR]

Published
2017
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