文献类型：期刊文献

英文题名：Low-temperature gas-phase toluene catalytic combustion over modified CoCr2O4 spinel catalysts: Effect of Co/Cr content and calcination temperature

作者：Gonzalez-Cobos, Jesus[1];Mylonoyannis, Brice[1];Chai, Guangtao[1];Zhang, Weidong[1];Tian, Chengcheng[2];Kaddouri, Akim[1];Gil, Sonia[1]

机构：[1]Univ Lyon, Univ Lyon 1, CNRS, UMR 5256,IRCELYON, 2 Ave Albert Einstein, F-69622 Villeurbanne, France;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：657

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;EI(收录号：20231313817386);WOS:【SCI-EXPANDED(收录号:WOS:001012743000001)】；

基金：Acknowledgements The authors gratefully acknowledge the financial support from the Science and Technology Commission of Shanghai Municipality (20230710700) . The authors would like to thank the scientific service and researchers of IRCELYON for the assistance in physico-chemical characterizations and for stimulating discussions and in particular to Mimoun Aouine, Laurence Burel, Pascale Mascunan, Yoann Aizac and Francoise Bosselet.

语种：英文

外文关键词：Cobalt and chromium doping; Chromite spinel oxides; Sol-gel method; Volatile organic compounds; Toluene combustion

摘要：Un-supported spinel-type cobalt chromite catalysts were synthetized by propionic acid-mediated sol-gel method and tested for toluene oxidation. The influence of the Co and Cr content and the preparation conditions on physico-chemical, surface and catalytic properties for this reaction has been for the first time evaluated. Co-rich CoCr2O4 was the most active catalyst, likely due to the formation of a single CoCr2O4 spinel phase, a favorable surface composition and higher low-temperature reducibility. Besides, the increase of the calcination tempera-ture, despite worsening textural properties, also has a promoting effect on the catalytic activity by preserving a suitable reducibility and further enhancing the surface properties. Surface Cr6+ ions and adsorbed oxygens (Oads), which are more abundant in the most efficient catalyst (Co-rich catalyst calcined at 685 degrees C), seem to play an important role on toluene oxidation reaction. These findings may open potential strategies in the development of efficient and economically competitive catalysts for elimination of VOCs like toluene.