文献类型：期刊文献

英文题名：Synthesis of Nb2O5 based solid superacid materials for catalytic combustion of chlorinated VOCs

作者：Yang, Peng[1];Fan, Shaokang[1];Chen, Zhenyang[1];Bao, Guofang[2];Zuo, Shufeng[1];Qi, Chenze[1]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China;[2]Shaoxing Qual Technol Supervis & Inspect Inst, Shaoxing 312000, Peoples R China

年份：2018

卷号：239

起止页码：114

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：SCI-EXPANDED(收录号：WOS:000446283800013)、、EI(收录号：20183205675374)、Scopus(收录号：2-s2.0-85051138601)、WOS

基金：This work was supported by the Scientific Research Program of Shaoxing University (grant numbers 2016LG1005 and 20165008, controlled synthesis of mixed oxide materials for catalytic degradation of industrial organic pollutants) and the National Natural Science Foundation of China (grant number 21577094).

语种：英文

外文关键词：Catalytic combustion; Chlorinated VOCs; Nb(2)O5; Solid superacid; Synergistic catalysis

外文摘要：Nb2O5 based solid superacids (Nb2O5-MOx, M = Ti, W, Zr, Si, Al and Ca, respectively) were synthesized by sol-gel method using citric acid as the cross-linking agent, and then were investigated for catalytic combustion of 1,2-dichloroethane (abbreviation: DCE), one of the typical examples for chlorinated VOCs pollutants. The research results of the structure-performance relationship show that mesopore and amorphous state structure are formed for Nb2O5-MOx, and the metal elements are highly dispersed, which contribute to enhancing the metal-metal interaction and modifying the physicochemical properties of the catalysts. The order for the inherent catalytic activity is: Nb2O5-WO3 > Nb2O5-ZrO2 > Nb2O5-TiO2 > Nb2O5-SiO2 > Nb2O5-Al2O3 > Nb2O5 > Nb2O5-CaO. There exists synergistic catalytic effect: the mesopore and surface acidity facilitate the adsorption, activation and destruction of the C-Cl bond in the reactants to form HCl and byproduct C2H3Cl (or carbocation intermediate), and then the redox sites promote deep oxidation of the byproduct/intermediate to convert to CO2 and H2O. Especially, the Nb2O5-TiO2 catalyst represents the highest apparent catalytic degradation activity. It also represents good thermal stability and durability for DCE destruction as well as good resistance to water vapor.