Article
Engineering, Environmental
Xiaosheng Huang, Fang Dong, Guodong Zhang, Yan Guo, Zhicheng Tang
Summary: In this work, core-shell Ce@MnOx catalysts were prepared by hydrothermal treatment, improving redox capacity through the coexistence of Ce and Mn. Yolk-shell Ce@Mn@TiOx structures were constructed to enhance ammonia adsorption and protect active sites, showing excellent catalytic performance for NH3-SCR. The outer TiO2 shell enhanced ammonia adsorption, while the MnOx interlayer ensured efficient redox cycles during the process.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Zhitao Han, Xiaodi Li, Xinxin Wang, Yu Gao, Shaolong Yang, Liguo Song, Jingming Dong, Xinxiang Pan
Summary: This paper investigates the promoting effects of support sulfation on the selective catalytic reduction (SCR) performance of CeO2/ZrO2 catalysts. It is found that sulfated ZrO2 can significantly enhance the SCR activity and low-temperature activity of the catalyst, promote the transformation of CeO2 and NH3 adsorption, and is related to factors such as redox property and chemisorbed labile oxygen.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Reeshma Rameshan, Phanikumar Pentyala, Satyapaul A. Singh, Parag A. Deshpande, Sounak Roy
Summary: This study used an integrated experimental and theoretical approach to investigate the catalytic mechanism of NO reduction on Ce1- xNixO2- δ solid solutions, revealing the crucial roles of oxygen vacancies and surface hydroxyl species in the reaction mechanism.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Weiye Qu, Xue Fang, Zhouhong Ren, Junxiao Chen, Xi Liu, Zhen Ma, Xingfu Tang
Summary: By introducing an appropriate amount of O3 into the simulated stack gas, the SCR activity at low temperatures (<250 degrees C) can be significantly enhanced. The introduction of O3 allows SCR to proceed along a NH4NO3-mediated Langmuir-Hinshelwood model, leading to the enhancement of activity at low temperatures.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Dongrun Xu, Weiye Qu, Junhong Liu, Junxiao Chen, Xue Fang, Liwei Chen, Zhen Ma, Xi Liu, Xingfu Tang, Yaxin Chen
Summary: This study provides evidence that dinuclear vanadium-tungsten sites are the most active catalytic sites in conventional V2O5-WO3/TiO2 SCR catalysts, contrary to the prevailing view. These sites have stronger acidity and higher concentration of vanadium 3d electrons, leading to improved NH3 adsorption and O-2 activation in SCR. This finding settles a long-standing dispute and has important implications for understanding SCR mechanisms and designing better catalysts.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Engineering, Environmental
Guangyan Xu, Hao Li, Yunbo Yu, Hong He
Summary: The reactivity of Bronsted acid sites on V2O5/TiO2 catalysts plays a crucial role in NH3-SCR reaction, while the reactivity of Lewis acid sites is overestimated. Abundant V-OH Bronsted acid sites govern the overall NOx reduction rate in realistic exhaust containing water vapor.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jin Yuan, JinXing Mi, Rongqiang Yin, Tao Yan, Hao Liu, Xiaoping Chen, Jun Liu, Wenzhe Si, Yue Peng, Jianjun Chen, Junhua Li
Summary: This study identifies the nucleophilic ketonic carbonyl groups as the intrinsic active sites for NO reduction on metal-free carbon catalysts through experimental and computational methods. The mechanism of the SCR reaction involving a redox cycle of ketonic carbonyl/phenol pairs is revealed, and it demonstrates analogous features with vanadyl catalysts, potentially parallel the SCR mechanisms on metal-free carbon catalysts to transition-metal catalysts.
Article
Chemistry, Physical
Marco Lunardon, Tomasz Kosmala, Christian Durante, Stefano Agnoli, Gaetano Granozzi
Summary: Electrochemical scanning tunneling microscopy (EC-STM) is an advanced technique that allows for atomic-level observation and quantitative evaluation of electrocatalytic activity, providing important insights into the microscopic mechanism of electrochemical reactions.
Article
Chemistry, Multidisciplinary
Jinsun Lee, Xinghui Liu, Ashwani Kumar, Yosep Hwang, Eunji Lee, Jianmin Yu, Young Dok Kim, Hyoyoung Lee
Summary: The study found that defect sites on disordered rutile phase of TiO2 are more favorable for N-2 adsorption, with lower energy barriers in the determining step of ammonia production. The synthesis of a phase-selective disordered rutile/ordered rutile TiO2 photocatalyst, based on theoretical simulations, demonstrated high NH3 formation rate and quantum efficiency under solar illumination.
Article
Energy & Fuels
Bo Qin, Rui-tang Guo, Jue Zhou, Lin-gang Wei, Tian-yi Yin, Wei-guo Pan
Summary: CuCeNbOx-0.4 catalyst prepared by the citric acid method exhibited excellent activity and selectivity in NH3-SCR process, with outstanding SO2 and H2O resistance as well as thermal stability. It had a large specific surface area, strong surface acidity, and effectively carried out SCR reaction at low temperatures, following the L-H and E-R mechanisms.
Article
Engineering, Environmental
Wenjin Ni, Dejian Yan, Shangjun Fu, Yanan Wei, Hongyun Yang, Xiaowen Zhang, Fangfang Zhao, Kuiyi You, He'an Luo
Summary: This study developed an environmentally friendly and efficient method for the selective oxidation of cyclohexylamine to cyclohexanone oxime by preparing TiO2 nanocrystals with different facets ratios. The dominant anatase TiO2 (001) catalyst showed promising results with 51.3% conversion of cyclohexylamine and 86.3% selectivity to cyclohexanone oxime, along with excellent stability. The TiO2 (001) facet provided abundant surface hydroxyl groups as catalytic active sites. DFT calculations revealed that the energy barriers for the rate determining steps in the oxidation of N-H bond on TiO2 (001) facet were lower than those on (101) facet, indicating better catalytic performance. This work offers new insights into the design of catalytic active sites for the selective oxidation of amines to oximes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Bolin Zhang, Shengyang Zhang, Shengen Zhang
Summary: This review summarizes the recent progress in the application of rare earths (REEs) in novel selective catalytic reduction (SCR) catalysts. It discusses the effects of REEs on catalytic activity, selectivity, stability, and resistance to sulfur dioxide. The review also covers the preparation and application of REEs-based catalysts and proposes a design strategy for SCR catalysts. The development prospects of REEs-based catalysts are also predicted.
PROGRESS IN CHEMISTRY
(2022)
Article
Chemistry, Applied
Runnong Yang, Zihan Gao, Ming Sun, Guangying Fu, Gao Cheng, Wuyuan Liu, Xiaobo Yang, Xiangyun Zhao, Lin Yu
Summary: The study has successfully designed a highly active VOx-MnOx/CeO2 material to meet the specific requirements of catalyst for selective catalytic reduction of NO with ammonia, achieving excellent activity and stability.
JOURNAL OF RARE EARTHS
(2021)
Review
Chemistry, Multidisciplinary
Yujie Shi, Yuwei Zhou, Yang Lou, Zupeng Chen, Haifeng Xiong, Yongfa Zhu
Summary: The uniformity of active sites is crucial for modulating the conversion of functional groups. This review examines the construction strategies and characterization techniques of atomically dispersed uniform active sites on various supports, and discusses their unique behavior in catalytic transformations and their industrial utilization. It also highlights current challenges and frontiers in this field.
Article
Materials Science, Multidisciplinary
Guilin Mu, Shuai Liu, Qingjie Liu, Shanshan Liu, Xintang Zhang
Summary: In this study, TiO2 supported Ni and Ce catalysts with different morphologies were prepared. The Ni-Ce/flower-like TiO2 (NCFT) catalyst showed high performance (approximately 100% NO conversion and N-2 selectivity) in the temperature range of 250-450 degrees C, with resistance of around 80%. The order of activities observed was NCFT > NCST > NCPT > NCRT. The flower-like TiO2 carrier provided the largest specific surface area, facilitating the dispersion of active components. NCFT also exhibited excellent denitrification activity due to its abundance in Ni3+, Ce3+, and O alpha species, which supported excellent redox properties and provided more adsorption sites for the NH3-SCR reaction. However, its sulfur resistance stability needs further improvement due to its unique structure.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Applied
Xinfeng Zhu, Yanli Mao, Hongpan Liu, Haiyan Kang, Biao Liu, Zhongxian Song, Xueping Liu, Yifei Guo, Huixian Du, Qiulin Zhang
APPLIED ORGANOMETALLIC CHEMISTRY
(2020)
Article
Chemistry, Applied
Zhongxian Song, Yun Xing, Tingji Zhang, Jinggang Zhao, Junkai Wang, Yanli Mao, Baolin Zhao, Xuejun Zhang, Min Zhao, Ziang Ma
APPLIED ORGANOMETALLIC CHEMISTRY
(2020)
Article
Chemistry, Applied
Zhenzhen Huang, Jinggang Zhao, Zhongxian Song, Wei Liu, Xuejun Zhang, Yanli Mao, Heng Zhao, Min Zhao, Shuixia Liu, Zhaodong Wang
APPLIED ORGANOMETALLIC CHEMISTRY
(2020)
Article
Chemistry, Applied
Wei Liu, Jiaying Fan, Zhongxian Song, Xuejun Zhang
Summary: Modifying Co(3)O(4) through a combination of structural template and Ce dopant can significantly improve its catalytic performance, leading to the superior catalytic performance of mesoporous CexCoO catalysts. Among them, Ce0.05CoO performs the best, achieving a toluene conversion rate of 90% at 238 degrees Celsius, which is maintained above 90% during 100 hours.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Jiebing Li, Jiawen Luo, Zhongxian Song, Haiyan Kang, Yanli Mao, Zhaodong Wang, Huixian Du, Dandan Pang
Summary: The catalytic activity of CeO2-WO3 catalysts depends on the content of WO3, the interaction between WO3 and CeO2, and the formation of redox ability. Excessive WO3 can decrease the SCR activity.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Applied
Junjie Jin, Zhongxian Song, Xuejun Zhang, Yanli Mao
Summary: CeO2 modified by silicotungstic acid showed superior performance in NH3-SCR reaction, achieving efficient NOx conversion by improving surface nitrate species and acid sites.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Xuejun Zhang, Yinghan Wu, Chenghua Qin, Zhuofu Zhang, Wei Liu, Zepeng Liu, Chunyu Liu, Xinfeng Zhu, Zhongxian Song
Summary: A series of MnOx catalysts were prepared by hydrothermal reaction under different pH values, which showed that the preparation conditions had a significant impact on the structure and performance of the catalysts. Among them, the cryptomelane MnOx catalyst with a pH of 10 exhibited the best catalytic performance, attributed to the reduction of Mn chemical valence, increase of Mn3+ content and oxygen vacancies. In-situ DRIFT results revealed the main intermediate products and reaction mechanism during catalysis.
Article
Chemistry, Applied
Jinhui Zhang, Hanyue Zhang, Xinfeng Zhu, Hongpan Liu, Guangchao Hou, Haiyan Kang, Biao Liu, Wenwen Zhu, Shiqiang Yin, Zongxian Song
Summary: Three kinds of 3D Mn2O3 catalysts with different morphologies and crystal planes were prepared by a hydrothermal method for benzene oxidation. The cube-shaped Mn2O3-Cl sample exhibited the highest rate of benzene degradation and the lowest complete benzene conversion temperature compared to other samples. TEM results showed that morphology significantly affected crystal planes. The superior catalytic activity of Mn2O3-Cl was attributed to its low crystallinity, excellent redox ability, abundant low-valence Mn ions, and O-latt species.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Jie Feng, Qiaoyun Liu, Haojie Li, Zhongxian Song, Lin Dong, Shufang Zhao, Young Dok Kim, Zhongyi Liu, Zhikun Peng
Summary: In this study, the lattice contraction and electron-rich surface of Pd were successfully regulated by doping low electronegative metal M (M = Zn, Ni, Co, or Cu), leading to an enhanced selectivity for the conversion of benzene to cyclohexylbenzene. Mechanistic investigation revealed that PdZn promoted the asymmetric adsorption and activation of benzene to cyclohexene, and regulated its moderate adsorption. This work provides new insights into the intrinsic regulation of tandem reactions with one key intermediate.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Xu Yan, Mengxia Ma, Yanli Mao, Haiyan Kang, Qun Yan, Jieqiang Zhou, Zhongxian Song, Long Pan, Yiming Zhang, Yanna Li, Leqi Cui, Han Zhu, Dandan Pang
Summary: Element doping has been used to modify the electronic structure of semiconductors and improve photocatalytic activity. In this study, a g-C3N4/O-doped ZnIn2S4 (CN/O-doped ZIS) heterojunction was prepared by coating oxygen-doped lamellar ZnIn2S4 (O-doped ZIS) nanosheets on layered g-C3N4 (CN). The optimized CN/O-doped ZIS showed significantly enhanced photocatalytic performance compared to CN and O-doped ZIS photocatalysts.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Haiyan Kang, Yanli Mao, Zhenzhen Huang, Xinfeng Zhu, Kai Wang, Xia Zhang, Hongchao Geng, Changrui Han, Zhongxian Song
Summary: ZnO@C3N4 composites prepared by one-pot calcination synthesis exhibit excellent photocorrosion-resistant and photocatalytic activity, making them suitable for the removal of multi-component organic pollutants from wastewater.
Article
Engineering, Environmental
Xuejun Zhang, Haiyang Li, Zhongxian Song, Wei Liu, Zepeng Liu, Dujuan Mo, Hongrun Gao, Mengru Zhang
Summary: This study investigated the influence of different preparation methods on CeMo samples for the catalytic combustion of toluene. The CeMo-HT catalyst prepared by the hydrothermal method showed the highest catalytic activity and thermal stability, attributed to the richer oxygen vacancies which promoted the deep oxidation of toluene.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Xuejun Zhang, Min Zhao, Zhongxian Song, Heng Zhao, Wei Liu, Jinggang Zhao, Zi'ang Ma, Yun Xing
NEW JOURNAL OF CHEMISTRY
(2019)
Article
Chemistry, Multidisciplinary
Xuejun Zhang, Yun Xing, Zhongxian Song, Heng Zhao, Min Zhao, Jinggang Zhao, Zi'ang Ma, Peipei Zhang, Noritatsu Tsubaki
NEW JOURNAL OF CHEMISTRY
(2019)
