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Synergistic effect between ceria and tungsten oxide on WO3-CeO2-TiO2 catalysts for NH3-SCR reaction

Progress in Natural Science:Materials International 2012年第4期22卷 265-272页

作者： Lei Chen Duan Weng Zhichun Si Xiaodong Wu State Key Lab of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua University Advanced Materials Institute Graduate School at ShenzhenTsinghua University Yangtze Delta Region Institute of Tsinghua University

WO3-CeO2-TiO2 catalysts for NO (nitrogen monoxide) reduction by ammonia were prepared by a sol-gel method. The catalysts were characterized by BET, XRD, Raman, NH3/NO adsorption and H2-TPR to investigate the relationships among the catalyst composition, structure, redox property, acidity and deNOx activity. WO3-CeO2-TiO2 catalysts show a high activity in a broad temperature range of 200-480 ℃. The low-temperature activity of catalysts is sensitive to the catalyst composition especially under low-O2-content atmospheres. It may be related to the synergistic effect between CeOx and WOx in the catalysts. On one hand, the interaction between ceria and tungsten oxide promotes the activation of gaseous oxygen to compensate the lattice oxygen consumed in NH 3-SCR (selective catalytic reduction) reaction at low temperatures. Meanwhile, the Brnsted acid sites mainly arise from tungsten oxides, Lewis acid sites mainly arise from ceria. Both of the Brnsted and Lewis acid sites facilitate the adsorption of NH3 on catalysts and improve the stability of the adsorbed ammonia species, which are beneficial to the NH3-SCR reaction.

关键词： NH3-SCR WO 3-CeO2-TiO2 catalysts Oxygen activation acid sites

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Effect of the Structure and acidic Property of Activated Bentonite on Removal of Olefin in Aromatics

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China Petroleum Processing & Petrochemical Technology 2009年第4期11卷 23-26页

作者： Wu Wenjuan Chen Changwei Wang Xin Shi Li (The State Key Laboratory of Chemical Engineering,East China University of Science and Technology, Shanghai 200237) State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

In this research work,three kinds of activated bentonite used as solid acid catalysts had been synthesized and studied on removal of olefins from the reformate *** bentonite samples were analyzed using the BET and pyridine-FTIR measurements to investigate their physical and chemical *** results showed that both textural properties and surface acidity of the bentonite could affect the catalytic *** the catalyst samples,one kind of bentonite purchased from Hubei with high surface area,high pore volume and more acid sites revealed high activity in removing olefins from the reformate.

关键词： bentomte N_2 adsorption isotherm pore size distribution acid sites

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Application of ammonia probe-assisted solid-state NMR technique in zeolites and catalysis

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Magnetic Resonance Letters 2022年第1期2卷 28-37,I0002页

作者： Chang Wang Weili Dai Guangjun Wu Naijia Guan Landong Li School of Materials Science and Engineering&National Institute for Advanced Materials Nankai UniversityTianjin300350China Key Laboratory of Advanced Energy Materials Chemistry of the Ministry of Education Collaborative Innovation Center of Chemical Science and EngineeringNankai UniversityTianjin300071China

Solid-state NMR(ssNMR)spectroscopy is a powerful technique for characterizing the surface sites of solid acids and organic intermediates formed during the acid catalyzed *** a very useful probe molecule,ammonia is often utilized to determine the density of solidacids’surface sites by ssNMR *** present mini-review summarizes some of the latest research developments on the quantitative characterization of the acid sites and carbenium ions during the zeolite catalytic reaction by ammonia probe-assisted ssNMR spectroscopy.

关键词： Solid-state NMR spectroscopy Ammonia probe acid sites Carbenium ions Zeolite catalysis

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Deep extractive and oxidative desulfurization of dibenzothiophene with SnO2

Deep extractive and oxidative desulfurization of dibenzothio...

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第十届全国催化剂制备科学与技术研讨会（成都）

作者： Aili Liu Panpan Zhang Bao Wang Mingyuan Zhu Bin Dai School of Chemistry and Chemical Engineering of Shihezi University Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical Engineering Shihezi University

The recycling and stability of heterogeneous catalysts are very important for industrialization. The stability of tin based catalyst was low due to its catalytic oxidation in liquid phase. we use a simple method to directly prepare tin oxide nanoparticles catalysts for deep oxidation desulfurization. The effects of catalysts on catalytic activity under different calcination temperatures were also investigated. During the oxidative desulfurization process, Sulfur removal of dibenzothiophene(DBT) in n-octane was 99.8% in 2 h at 60℃ under the conditions of HO/DBT molar ratio of ten and M(catalyst): V(oil) = 0.1 g:10 ml. And there was no significant catalytic performance decrease after 14 recycles. This excellent catalytic activity and recoverability of the catalyst was attributed to the change of specific surface area, acidic site strength of catalysts caused by different heat treatment temperatures, which may produce beneficial Lewis acid sites. The synthesized SnO catalyst was characterized via XPS, XRD, HRTEM, FT-IR, NH-TPD, and ICP-AES.

关键词： tin oxide Oxidative desulfurization Calcination acid sites Recyclability

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