Review
Energy & Fuels
M. Sunil Kumar, M. S. Alphin, P. Senthil Kumar, S. Raja
Summary: This review examines the performance of a zeolite catalyst with metal substitutions in reducing NOx emissions. Zeolite with small pores and copper substitutions exhibits better deNOx efficiency and thermal stability. Cu-SSZ-13 and Cu-SAPO-34 show good thermal stability in a wider temperature range. The Si/Al ratio plays a crucial role in deNOx efficiency.
Article
Chemistry, Physical
Xuan Geng, Baozhong Zhu, Yunlan Sun, Jiuyu Chen, XinJian Zhou, Mengchen Li, Minggao Xu
Summary: This study investigates the effects of Ca poisoning on the surface of γ-Fe2O3 catalysts and Ce modified Ca-γ-Fe2O3 catalysts in the NH3 selective catalytic reduction (SCR) of NOx. Ca poisoning leads to a decrease in surface acidity and an increase in stable nitrite/nitrate species. Ce modification provides additional NH3 adsorption sites, improving the adsorption and activation of NH3.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yafang Liu, Jun Liu, Baozhong Zhu, Jiuyu Chen, Fan Li, Yunlan Sun
Summary: The effect of Co doping on the deNOx activity of Mn-based catalysts and the reaction mechanism of gas molecules over the beta-MnO2 (110) surface were revealed by combining experimental measurements and DFT simulations. Results showed that Co doping can enhance the deNOx efficiency of MnO2 catalysts and alleviate the poisoning effect of H2O. The Langmuir-Hinshelwood mechanism dominated the reaction of NH2NO breakdown.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Environmental Sciences
Hui Chen, Wei Wu, Dezhen Chen, Yuheng Feng
Summary: Sewage sludge char (SC) has potential as a reducing agent in flue gas cleaning systems by reducing NO to N2 at high temperatures. However, modifications are needed to enhance its carbon-deNOx performance. This study compared the carbon-deNOx performance of coal char (CC) and different types of SCs, including original (SC-R), pyrolytic volatiles activated (SC-V), and KOH activated (SC-K), in terms of NO removal rate and secondary pollution discharged.
Article
Energy & Fuels
Running Kang, Junyao He, Feng Bin, Baojuan Dou, Qinglan Hao, Xiaolin Wei, Kwun Nam Hui, Kwan San Hui
Summary: A series of V2O5/HWO catalysts were prepared by hydrothermal and impregnation methods, with the V2O5/HWO-C catalyst showing optimal NH3-SCR performance due to its rod-shaped morphology and high dispersion. The K-loaded K-V2O5/HWO-C catalyst exhibited effective resistance to K poisoning and SO2, maintaining high NOx conversion efficiency at high temperatures.
Article
Chemistry, Physical
Jialiang Zhou, Baozhong Zhu, Jiaxin Wang, Yunlan Sun, Yafang Liu, Minggao Xu
Summary: This study investigated the effects of Pb and Zn doping on the deNOx reaction over beta-MnO2 catalyst using the DFT method. The results revealed that Pb and Zn can inhibit the adsorption of NH3 and O2, leading to a decrease in catalyst activity. Pb and Zn also limit the formation and decomposition of *NH2NO intermediates and prevent the formation of hydroxyl groups, ultimately inhibiting the deNOx reaction.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Shangchao Xiong, Jianjun Chen, Hao Liu, Xiaoping Chen, Wenzhe Si, Zhengjun Gong, Yue Peng, Junhua Li
Summary: This study analyzes the synergistic effect of sulfur (S) and alkali metals (K) on the V2O5/TiO2 (VTi) catalyst for the NH3 selective catalytic reduction (NH3-SCR) reaction. It is found that the presence of S and K exhibits a detoxification effect, alleviating the alkali metal poisoning of commercial catalysts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Agricultural Engineering
Lilong Yan, Caixu Wang, Jishuang Jiang, Shuang Liu, Yaoqi Zheng, Mengya Yang, Ying Zhang
Summary: A new type of aerobic nitrification-reducing bacteria, Pseudomonas XS-18, was isolated and studied for its nitrate removal capacity and alkali tolerance mechanism. XS-18 demonstrated high efficiency in nitrate removal and conversion in strong alkaline conditions, showing potential for application in alkaline wastewater treatment.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Physical
Inhak Song, Se Won Jeon, Hwangho Lee, Do Heui Kim
Summary: Utilizing mechanochemical interactions to fabricate hybrid catalysts is an important emerging area in heterogeneous catalysis. This study reports the unusual deactivation of a vanadia catalyst and successfully resolves this issue through surface functionalization, resulting in a hybrid catalyst with superior sulfur resistance in low-temperature SCR.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Applied
Shilin Zhao, Junlin Peng, Yuxin Qian, Zhiqiang Sun
Summary: The low-temperature deNOx performance of various zFe-CexMny catalysts was evaluated in this study. The 4FeMn7Ce3 catalyst with 4 wt% Fe based on Mn7Ce3 showed the best deNOx performance, achieving over 90% deNOx efficiency at temperatures of 120-220 degrees C. Fe doping resulted in uniform distribution of the oxide on the catalyst's surface, promoting the valence cycle and producing more Mn4+ and Ce3+ species for optimal low-temperature deNOx. The presence of Lewis acid sites on the catalyst's surface enhanced the formation of amide species, facilitating the deNOx reaction. Both E-R and L-H mechanisms were observed in the deNOx process of zFe-CexMny catalysts. These findings are valuable for the development of high-performance low-temperature deNOx catalysts.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yafang Liu, Jiaxin Wang, Baozhong Zhu, Xinjian Zhou, Jialiang Zhou, Fan Li, Yunlan Sun
Summary: The study explored the poisoning mechanism of K and SO2 coexistence on the deNOx performance of MnO2/TiO2 catalyst using density functional theory combined with experimental methods. It was found that SO2 had low adsorption performance but could be oxidized to form SO3 and react with the catalyst to form sulfates. K poisoning hindered the adsorption of NH3 and NO molecules on the catalyst surface, but the introduction of SO2 alleviated the K poisoning by interacting with K and changing the charge transfer. These findings provide insights into the mechanism and design of Mn-based catalysts with high anti-poisoning ability.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Review
Chemistry, Physical
Young-Ho Oh, Ju Gyeong Jeong, Dong Wook Kim, Sungyul Lee
Summary: In this article, we review the studies on crown ether-facilitated nucleophilic reactions using metal salts, with a focus on the mechanistic features and experimental verification of the contact ion-pair (CIP) mechanism of metal salts. Kinetic measurements and quantum chemical methods are employed for the analysis. The use of chiral crown ethers and derivatives for enantioselective nucleophilic processes is also discussed.
Article
Chemistry, Physical
Lin Huangfu, Shuying Zhao, Jianting Li, Zhitiang Yao, Changming Li, Shiqiu Gaoa, Jian Yu
Summary: The study investigates the structural evolution of vanadate catalysts in the presence of sulfur dioxide and its impact on DeNO(x) behaviors. It was found that sulfur dioxide promoted the decomposition of supported Mn2V2O7, leading to the formation of VOx species and MnSO4 on TiO2, thus increasing the dispersity of active V species and specific surface area. The decomposition and sulfation of supported Mn2V2O7 enhanced catalytic activity and N-2 selectivity due to the exposure of more active V sites, O-alpha species, and acid sites.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Construction & Building Technology
Zhongjing Hu, Qingbiao Wang, Hao Lv, Kesheng Li, Jinpeng Zhang, Yiming Ma
Summary: This study addresses the limitations of traditional fiber-reinforced shotcrete by introducing innovative alkali-resistant glass fiber series products, which greatly enhance the mechanical properties and microstructure of shotcrete. The research findings provide new ideas for the development and design of mixed fiber shotcrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Hengheng Liu, Fengyu Gao, Songjin Ko, Ning Luo, Xiaolong Tang, Honghong Yi, Yuansong Zhou
Summary: In this study, a low-temperature NH3-SCR denitrification catalyst was prepared using Chlorella cells. Compared to the pure MnOx catalyst, the Chlorella@Mn catalyst exhibited higher NOx conversion, N2 selectivity, and resistance to H2O poisoning. The adsorption process of Chlorella cells involved electrostatic interaction, complexation/chelation, and ion exchange mechanisms.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Multidisciplinary Sciences
Yaxin Chen, Daiming Tang, Zhiwei Huang, Xi Liu, Jun Chen, Takashi Sekiguchi, Weiye Qu, Junxiao Chen, Dongrun Xu, Yoshio Bando, Xiaolei Hu, Xiaoping Wang, Dmitri Golberg, Xingfu Tang
Summary: The study successfully fabricated stable atomic silver wires (ASWs) with excellent conductivity and stability, which could be applied in thermal electrical devices.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Xiaolei Hu, Junxiao Chen, Weiye Qu, Rui Liu, Dongrun Xu, Zhen Ma, Xingfu Tang
Summary: By tuning the electronic structures of ceria highly dispersed on acidic MoO3 surfaces, a strong sulfur-resistant ceria-based catalyst can be designed to efficiently control the impact of SO2 at low temperatures on ceria-based SCR catalysts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Shuya Li, Bo Zhang, Di Wu, Zhiwei Li, Sheng-Qi Chu, Xiang Ding, Xingfu Tang, Jianmin Chen, Qing Li
Summary: The study found that the iron and steel industry is the main source of magnetic particle emissions in the atmosphere, with magnetite being the dominant magnetic contributor. These particles may have adverse health impacts on human beings.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Chemistry, Physical
Junxiao Chen, Xue Fang, Zhouhong Ren, Weiye Qu, Xiaolei Hu, Zhen Ma, Liwei Chen, Xi Liu, Yaxin Chen, Xingfu Tang
Summary: The development of a novel catalyst Mo-1/TiO2 enables the decomposition of ABS at low temperatures, effectively addressing the issue of SO2 deactivation in SCR catalysts. This provides a new approach to controlling NOx emissions from industrial boilers.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Engineering, Environmental
Xue Fang, Weiye Qu, Tian Qin, Xiaolei Hu, Liwei Chen, Zhen Ma, Xi Liu, Xingfu Tang
Summary: This study investigates the synergy between Ce and W in selective catalytic reduction (SCR) by designing a Ce1-W1/TiO2 model catalyst. The strong electronic interaction within Ce1-W1 atom pairs is found to enhance the SCR performance of Ce1-W1/TiO2 catalysts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Review
Chemistry, Physical
Ruiyang Chen, Zhengzi Sun, Christopher Hardacre, Xingfu Tang, Zhiming Liu
Summary: This article reviews the current progress in the catalytic oxidation of formaldehyde, discussing the relationship between catalyst structure and reaction mechanism as well as the factors influencing catalyst activity. The article also presents future research prospects in this field.
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Xiaolei Hu, Weiye Qu, Junxiao Chen, Dongrun Xu, Jing Liu, Yangyang Dong, Rui Liu, Zhen Ma, Xingfu Tang
Summary: This study tackles the issue of insufficient catalytic efficiency of SCR at low temperatures by designing a Ce-W/TiO2 catalyst with reactants-coupling dual catalytic sites. The results reveal that W and Ce are highly dispersed to form dual catalytic sites, which enhance NH3 and NO adsorption and facilitate the reaction between them. The Ce-W synergy boosts the SCR performance at low temperatures by promoting the activation of O-2.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Zhiwei Huang, Jin-Xia Liang, Daiming Tang, Yaxin Chen, Weiye Qu, Xiaolei Hu, Junxiao Chen, Yangyang Dong, Dongrun Xu, Dmitri Golberg, Jun Li, Xingfu Tang
Summary: By fabricating catalysts with exposed ending silver atoms, it has been discovered that only the catalyst with both ending silver atoms exposed can trigger carbon monoxide oxidation, providing evidence that interaction between active sites is possible with eligible electron conducting.
Article
Chemistry, Multidisciplinary
Weiye Qu, Haiyang Yuan, Zhouhong Ren, Jizhen Qi, Dongrun Xu, Junxiao Chen, Liwei Chen, Huagui Yang, Zhen Ma, Xi Liu, Haifeng Wang, Xingfu Tang
Summary: This study presents a solution to maximize effective adsorption and speedy surface reactions in catalysis by designing atom-pair catalytic sites with tunable electronic interactions. The strategy was successfully applied in NO selective reduction reaction, resulting in significantly higher reaction rates.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Editorial Material
Multidisciplinary Sciences
Weiye Qu, Zhen Ma, Xingfu Tang
CHINESE SCIENCE BULLETIN-CHINESE
(2023)
Article
Chemistry, Physical
Dongrun Xu, Weiye Qu, Xiao Gu, Meiyu Li, Rui Liu, Yangyang Dong, Zhen Ma, Yaxin Chen, Xingfu Tang
Summary: This study proposes a frontier band orbital descriptor that rationalizes catalytic activity trends over a series of perovskite oxides, providing a promising strategy for designing optimal semiconducting metal oxide catalysts.
Article
Chemistry, Multidisciplinary
Rui Liu, Weiye Qu, Xiaolei Hu, Junxiao Chen, Yangyang Dong, Dongrun Xu, Jing Liu, Zhen Ma, Xingfu Tang
Summary: The valence state of single Au atoms anchored on CeO2(100) can be tuned to enhance the CO oxidation activity of Au-1/CeO2(100) by one order of magnitude. This work is significant for understanding reaction mechanisms and designing high-performance catalysts.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Xiaolei Hu, Shuya Li, Yaxin Chen, Weiye Qu, Junxiao Chen, Zhen Ma, Xingfu Tang
CHEMICAL COMMUNICATIONS
(2020)