文献类型：期刊文献

英文题名：Controlled synthesis of niobium and rare earth mixed oxides for catalytic combustion of chlorinated VOCs in the synthesis process of polyether polyol and polyurethane

作者：Jin, Yinying[1];Quan, Yiyao[1];Liu, Jiang[1];Qi, Chenze[1];Pan, Pengju[2];Shan, Bofang[3];Luo, Hong[3];Yang, Peng[1,2,3]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China;[2]Zhejiang Univ, Coll Chem & Biol Engn, State Key Lab Chem Engn, 38 Zheda Rd, Hangzhou 310027, Peoples R China;[3]Zhejiang Hengfeng New Mat Co LTD, Shaoxing 312000, Peoples R China

年份：2022

卷号：313

外文期刊名：JOURNAL OF SOLID STATE CHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000876060400002)、、EI(收录号：20222612293250)、Scopus(收录号：2-s2.0-85132857623)、WOS

基金：The authors gratefully acknowledge the financial supports for this research paper provided by the National Natural Science Foundation of China (NSFC, No. 21906106), the Zhejiang Provincial Natural Science Foundation of China (No. LQ19B030004 and No. LGC20B010001), the Soft Science Research Project of Shaoxing Association of Science and Technology, the Postdoctoral Scientific Research Program of Zhejiang Hengfeng New Materials Co., LTD and Zhejiang University.

语种：英文

外文关键词：Chlorinated VOCs; Catalytic combustion; Oxygen-rich CeNbO4+delta; Nb2O5; Rare earth; Mixed oxide

外文摘要：Catalytic technique is an effective and economical method to deal with air pollution. This work investigated the effect of recombination of rare earth (RE = Y, La, Ce, Pr and Nd) and Nb element, different calcination temperature and preparation methods on the physical/chemical properties of RENbO4+delta mixed oxides. These materials were used for catalytic combustion of chlorinated VOCs (using monochlorobenzene and 1,2-dichloroethane as representative examples), and the structure-performance relationship was explored. The results showed that the optimal catalyst was the oxygen-rich Ce-Nb-O mixed oxide. It was gradually sintered above 700 degrees C to form CeNbO4+delta compound, and its apparent catalytic activity decreased with the increase of calcination temperature. The high dispersion of Nb2O5 into CeO2 matrix lead to strong interaction between Ce, Nb and O elements, and thus more active oxygen species were obtained, which was beneficial to improving redox property and catalytic performance of catalyst. The apparent catalytic activity decreased in the order of CeNbO-hp (homogeneous precipitation of urea)>CeNbO-cp (co-precipitation of (NH4)(2)CO3)>CeNbO-sg (citric acid based sol-gel method) >CeNbO-mm (simple mechanical mixing of Nb2O5 and CeO2)>pure Nb2O5, CeO2. In the continuous reaction of 100 h, both monochlorobenzene and 1,2-dichloroethane could be completely destroyed at 320 degrees C to form HCl, CO2 and H2O on the optimized CeNbO-hp.