| Title: | Phosphate-Functionalized CeO(2) Nanosheets for Efficient Catalytic Oxidation of Dichloromethane |
| Author(s): | Dai Q; Zhang Z; Yan J; Wu J; Johnson G; Sun W; Wang X; Zhang S; Zhan W; |
| Address: | "Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering , East China University of Science & Technology , Shanghai 200237 , P. R. China. Department of Chemistry , University of Virginia , Charlottesville , Virginia 22904 , United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Tuning the nature and profile of acidic and basic sites on the surface of redox-active metal oxide nanostructures is a promising approach to constructing efficient catalysts for the oxidative removal of chlorinated volatile organic compounds (CVOCs). Herein, using dichloromethane (DCM) oxidation as a model reaction, we report that phosphate (PO (x)) Bronsted acid sites can be incorporated onto a CeO(2) nanosheet (NS) surface via an organophosphate-mediated route, which can effectively enhance the CeO(2)'s catalytic performance by promoting the removal of chlorine poisoning species. From the systematic study of the correlation between PO (x) composition, surface structure (acid and basic sites), and catalytic properties, we find that the incorporated Bronsted acid sites can also function to decrease the amount of medium-strong basic sites (O(2-)), reducing the formation of chlorinated organic byproduct monochloromethane (MCM) and leading to the desirable product, HCl. At the optimized P/Ce ratio (0.2), the PO (x)-CeO(2) NSs can perform a stable DCM conversion of 65-70% for over 10 h at 250 degrees C and over 95% conversion at 300 degrees C, superior to both pristine and other phosphate-modified CeO(2) NSs. Our work clearly identifies the critical role of acid and basic sites over functionalized CeO(2) for efficient catalytic CVOCs oxidation, guiding future advanced catalyst design for environmental remediation" |
| Keywords: | *Cerium *Methylene Chloride Organophosphates Oxidation-Reduction Phosphates; |
| Notes: | "MedlineDai, Qiguang Zhang, Zhiyong Yan, Jiaorong Wu, Jinyan Johnson, Grayson Sun, Wei Wang, Xingyi Zhang, Sen Zhan, Wangcheng eng Research Support, Non-U.S. Gov't 2018/10/30 Environ Sci Technol. 2018 Nov 20; 52(22):13430-13437. doi: 10.1021/acs.est.8b05002. Epub 2018 Nov 8" |
