文献类型：期刊文献

英文题名：Mesoporous silica-pillared clays supported nanosized Co3O4-CeO2 for catalytic combustion of toluene

作者：Cheng, Zhen[1];Chen, Zhu[1];Li, Jingrong[1];Zuo, Shufeng[1];Yang, Peng[1]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China

年份：2018

卷号：459

起止页码：32

外文期刊名：APPLIED SURFACE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000444600300005)、、WOS

基金：The authors would like to thank the support provided by the National Natural Science Foundation of China (Project 21577094).

语种：英文

外文关键词：Silica-pillared clay; Nano-composite; Co3O4-CeO2; Toluene combustion

外文摘要：Mesoporous silica-pillared clay (SPC) was synthesized by a soft template method. Compared with the raw montmorillonite (MMT), the basal spacing of SPC increased from 0.96 to 2.61 nm, the specific surface area increased from 30 to 453 m(2)/g, and the thermal stability was also improved, all of which could reduce the mass transfer resistance and improve the adsorption capacity of toluene. SPC supported Co3O4 and rare earth (Y, La, Ce, Pr and Nd) nano-composite catalysts were prepared by a deposition-precipitation method. Among them, 10% Co-5% Ce/SPC displayed the highest catalytic combustion activity, and the reaction temperature for toluene combustion was about 200 degrees C (98% conversion). This catalyst displayed good durability, and conversion of toluene dropped slightly from 96% to 90% in 1000 h continuous reaction at 190 degrees C. Co3O4 and CeO2 had particle sizes of 5-8 nm and were dispersed homogeneously on the surface of SPC. Introduction of CeO2 enhanced oxygen storage/transport capacity, and improved the dispersion of Co3O4 on SPC. The interaction of Co3O4-CeO2 and SPC, the co-existence of Co2+/Co3+ and the higher concentration of Ce3+ ions on the catalyst surface contribute to the high catalytic oxidative activity of 10% Co-5% Ce/SPC for toluene combustion.