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118. Emerging Pollutants - Part II: Treatment

Author

Liu, Bo, Zhang, Shengen, Chein-Chi, Chang, Dong, Zhanfeng, and Li, Hongxiang

Subjects
Ecological Modeling, Environmental Chemistry, Waste Management and Disposal, Pollution, Water Science and Technology
Abstract

Emerging contaminants are considered as some substances of actual or potential threat to human health or environment, which include endocrine disruptors, pharmaceutical, personal care products, nanoparticles, antibiotic resistance genes and chemicals used in packaging products, etc. The disposal and treatment of emerging contaminants has become a key problem in the field of water pollution control. The purpose of this review is to summarize published researches on emerging pollutants treatment in 2014.

Published
2015

130. Nanotubular Gamma Alumina with High-Energy External Surfaces: Synthesis and High Performance for Catalysis

Author

Cai, Weimeng, primary, Zhang, Shengen, additional, Lv, Jiangang, additional, Chen, Junchao, additional, Yang, Jie, additional, Wang, Yibo, additional, Guo, Xuefeng, additional, Peng, Luming, additional, Ding, Weiping, additional, Chen, Yi, additional, Lei, Yanhua, additional, Chen, Zhaoxu, additional, Yang, Weimin, additional, and Xie, Zaiku, additional

Published
2017
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135. Comparative study on transition element doped Mn–Zr–Ti-oxides catalysts for the low-temperature selective catalytic reduction of NO with NH3.

Author

Zhang, Bolin, Zhang, Shengen, and Liu, Bo

Abstract

The effect of Cu, Fe, Co, Ni, Cr and Zn on Mn–Zr–Ti mixed oxides catalysts introduced by co-precipitation was investigated. The Mn–Co catalyst showed the highest NO conversion near 100% and a good N2 selectivity > 90% at 200–300 °C. Comparing with the Mn–non catalyst, the Mn–Co catalyst presented a higher reaction rate constant at 120 °C with 23.3 ml s−1 g−1. The Mn–Co catalyst possesses a high concentration of Mn4+ and surface labile oxygen, which should improve the redox property and increase catalytic activity. Additionally, the Mn–Co showed the highest ratio of Lewis acid sites. The resistance to SO2 was improved by incorporation of Co. In summary, the Mn–Zr–Ti mixed oxides catalyst have a better N2 selectivity than other Mn-based catalysts and could be improved by doping with Co. [ABSTRACT FROM AUTHOR]

Published
2019
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136. Selective catalytic reduction of NOx with NH3 over Mn-Zr-Ti mixed oxide catalysts.

Author

Zhang, Bolin, Liebau, Michael, Liu, Bo, Li, Lin, Zhang, Shengen, and Gläser, Roger

Subjects
CATALYTIC reduction, NITRIC oxide, AMMONIA, MANGANESE catalysts, ZIRCONIUM catalysts, TITANIUM catalysts, CATALYTIC activity, REACTION mechanisms (Chemistry)
Abstract

Mixed oxide catalysts yMn-Zr-Ti (y/10/10 with y = 1, 3, 5, 7 and 9) for the selective catalytic reduction (SCR) of NOx with NH3 in the presence of oxygen were synthesized by co-precipitation. The catalyst 5Mn-Zr-Ti exhibited a catalytic activity higher than 87% above 160 °C and N2 selectivity above 92% at 100-300 °C. The SCR performance was quite stable at 180 and 200 °C for 15 h. Mn species are shown to improve the catalytic activity by providing more surface labile oxygen, while a synergistic effect among Mn, Zr and Ti species suppressed the generation of N2O. According to in situ DRIFT analysis, NOx was primarily reduced by the reaction of bidentate nitrate and monodentate nitrito species with adsorbed NH3. Subsequently, a comprehensive reaction mechanism was proposed. Accordingly, the formation of NH species was inhibited, and hence, the N2O formation by the reaction of NH and bidentate nitrate was suppressed. Furthermore, the investigation of the deactivation mechanism by SO2 indicated that both the deposition of ammonium sulfates and the sulfation of Mn active sites resulted in the deactivation of the catalyst 5Mn-Zr-Ti. The deposition of ammonium sulfates at 180 °C was more pronounced than that at 220 °C. [ABSTRACT FROM AUTHOR]

Published
2019
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143. Emerging Pollutants -- Part II: Treatment.

Author

Liu Bo, Zhang Shengen, and Chein-chi Chang

Subjects
*EMERGING contaminants, *MICROPOLLUTANTS, *ENDOCRINE disruptors
Abstract

Emerging contaminants are considered as some substances of actual or potential threat to human health or environment, which include pharmaceutical, personal care products, endocrine disruptors, nanoparticles, antibiotic resistance genes and chemicals used in packaging products, etc. How to treat these emerging pollutants in water bodies with green, high efficiency and low-cost has become the focus of attention. The purpose of this review is to summarize published researches on emerging pollutants treatment in 2017. [ABSTRACT FROM AUTHOR]

Published
2017
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144. Suppression of N2O formation by H2O and SO2in the selective catalytic reduction of NO with NH3over a Mn/Ti–Si catalystElectronic supplementary information (ESI) available. See DOI: 10.1039/c9cy01156k

Author

Zhang, Bolin, Liebau, Michael, Suprun, Wladimir, Liu, Bo, Zhang, Shengen, and Gläser, Roger

Abstract

A Mn/Ti–Si catalyst was synthesized and investigated using the NH3selective catalytic reduction (NH3-SCR) of NO in a dry flow and in the presence of H2O or SO2. In particular, the effect of H2O and SO2was studied in several model reactions to obtain a deeper insight into the impact of poisoning compounds on N2O formation. The adsorption behavior of NO and NH3indicated that H2O and SO2decreased the adsorption capacity for NO and increased the adsorption capacity for NH3. The formation of N2O from the disproportionation of NO was negligible. The increase in the adsorption capacity for NH3caused by H2O and SO2did not result in an increase in N2O formation. The formation of N2O from the reaction of NO with NH3was significantly inhibited by H2O and SO2, which could be attributed to the inhibition of the pathway viathe Langmuir–Hinshelwood mechanism. The SCR measurements indicated that the formation of N2O primarily originated from the oxidation of NH3and was suppressed in the presence of H2O or SO2, with a stronger observable effect in the presence of H2O. The formation of N2O is influenced by both the acid–base properties and the redox properties. A mechanism for N2O formation and the suppression effect of H2O and SO2over the Mn/Ti–Si catalyst was proposed, which suggested that the NH3adsorbed on the Brønsted acid sites could inhibit the formation of N2O.

Published
2019
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