Catalytic combustion of chlorinated aromatics over WOx/CeO2 catalysts at low temperature

Gu, Yan; Cai, Tonghui; Gao, Xiaohui; Xia, Hangqi; Sun, Wei; Zhao, Jian; Dai, Qiguang; Wang, Xingyi

doi:10.1016/j.apcatb.2018.12.055

Cited by 135 publications

(33 citation statements)

References 49 publications

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“…Again, E a increased with the increased of Ce content. The Ea values obtained with the catalysts prepared in this work resulted in the same order than those presented by Hao Huang and coworkers 1,3 with Ru/CeO 2 and VO x /CeO 2 catalysts for catalytic combustion of chlorobenzene and also resulted similar to those presented by Gu and coworkers with WO x /CeO 2 catalysts in the same reaction 29 . The turnover frequencies (TOF) were calculated as moles of converted chlorobenzene per hour and per surface area of catalyst according to the reaction rates at J o u r n a l P r e -p r o o f 8 200 °C.…”

Section: J O U R N a L P R E -P R O O Fsupporting

confidence: 87%

Catalytic feasibility of Ce-doped LaCoO3 systems for chlorobenzene oxidation: An analysis of synthesis method

Pérez

López

Cadús

et al. 2022

Journal of Rare Earths

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Section: J O U R N a L P R E -P R O O Fsupporting

confidence: 87%

Catalytic feasibility of Ce-doped LaCoO3 systems for chlorobenzene oxidation: An analysis of synthesis method

Pérez

López

Cadús

et al. 2022

Journal of Rare Earths

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“…The performance of 2% HPW/CeO2 catalyst is greatly superior to that of 2% HPW/SiO2 (80% NO conversion is achieved at 420 °C), indicating the favorable synergistic effect created between tungsten and the ceria. In the 2% HPW/CeO2, the interaction between Ce atom and isolated tungsten (monomeric) (revealed by Raman) produces W(=O)2(O-Ce)2 and W(=O)(O-Ce)4 species [23,39]. This may explain the best activity and the highest stability at high temperature obtained for this 2% HPW/CeO2 catalyst, where the highest proportion of isolated species is observed.…”

Section: Catalytic Activitymentioning

confidence: 78%

NH3-Selective Catalytic Reduction of NOx to N2 over Ceria Supported WOx Based Catalysts: Influence of Tungsten Content

et al. 2021

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A series of HPW/CeO2 catalysts generated from 12-tungstophosphoric acid, H3PW12O40 (HPW), supported on ceria and presenting different tungsten loadings (2, 4.5, 9, 16, and 40 wt% W) were prepared and characterized by N2 physisorption, XRD, IR, Raman, and UV-Vis. The different characterization techniques suggested that low loading of tungsten resulted in mainly isolated sites, while high tungsten loading produced polymeric or tungsten clusters. Those materials exhibited high activity in NH3-SCR of NOx into N2. Moreover, the series of experiments indicated that low loading in tungsten (2% HPW/CeO2) displayed the highest activity with a remarkable N2 selectivity (99%) at medium-high temperature (300–515 °C), owing to the high amount of monomeric tungstate coverage on the catalyst surface.

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“…One of the main challenges is to select suitable, economical and highly efficient catalysts from large number of potential alternatives. Solid catalytic materials commonly investigated are supported precious metal catalysts [10][11][12][13][14][15][16], solid acid catalysts [16][17][18][19][20][21][22] and transition metal/rare earth oxide catalysts [23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

et al. 2021

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Emission of volatile organic compounds has important influence on complex air pollution and human health. In this paper, a series of tungsten-iron composite oxides with different proportions and preparation methods were synthesized and first used for catalytic combustion of chlorobenzene and toluene, as typical polluting gas sources. These WO 3 -based solid catalytic materials were systematically characterized by modern analytical methods, and the results showed that there was strong electron interaction between W and Fe elements in the composite oxides, and the presence of a certain amount of tungsten oxide inhibited the crystallization of iron oxide, and vice versa, which were beneficial to the uniform dispersion of tungsten-iron components into each other and the improvement of redox properties. Compared with single-component oxide, the formation of tungsten-iron composite oxide affected the micro-structure, improved the specific surface area and optimized the pore structure of materials. The performance test results showed that the tungsten-iron composite oxide (FeWO 4 -0.5Fe 2 O 3 , molar ratio of tungsten and iron was 1/2) prepared using citric acid-based sol-gel method was the optimal, and its catalytic degradation efficiency could reach 90% for chlorobenzene and 83% for toluene at 320 °C, and maintain at least 60 h without obvious deactivation, with high selectivity to the formation of HCl and CO 2 . KeywordsVolatile organic compounds • Catalytic combustion • WO 3 • FeWO 4 • Composite oxide • Synergistic catalytic effect Tungsten www.springer.com/42864

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Catalytic combustion of chlorinated aromatics over WOx/CeO2 catalysts at low temperature

Cited by 135 publications

References 49 publications

Catalytic feasibility of Ce-doped LaCoO3 systems for chlorobenzene oxidation: An analysis of synthesis method

Catalytic feasibility of Ce-doped LaCoO3 systems for chlorobenzene oxidation: An analysis of synthesis method

NH3-Selective Catalytic Reduction of NOx to N2 over Ceria Supported WOx Based Catalysts: Influence of Tungsten Content

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

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