| Title: | Enhanced catalytic activity of OMS-2 for carcinogenic benzene elimination by tuning Sr(2+) contents in the tunnels |
| Author(s): | Ni C; Hou J; Wang Z; Li Y; Ren L; Wang M; Yin H; Tan W; |
| Address: | "Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China. Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China. Electronic address: houjt87@163.com. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China. School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China" |
| DOI: | 10.1016/j.jhazmat.2020.122958 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Cryptomelane-type manganese oxides (OMS-2) have been intensively investigated for application in the catalytic oxidation of carcinogenic benzene, and doping metal ions in the OMS-2 tunnels are widely used for modifying its catalytic activity. In this study, we reported a novel strategy of enhancing catalytic activity of OMS-2 for carcinogenic benzene elimination by tuning Sr(2+) concentration in the tunnels. The catalytic activity result revealed that an obvious decrease ( big up tri, openT(50) = 27 degrees C and big up tri, openT(90) = 37 degrees C) in T(50) and T(90) (corresponding to benzene conversions at 50 % and 90 %, respectively; initial benzene concentration was 2000 mg m(-3); contact time was 1.5 s) had been observed by increasing the Sr(2+) concentration in the OMS-2 tunnels. The origin of Sr(2+) doping effect on catalytic activity was theoretically and experimentally investigated by CO temperature-programmed reduction, (18)O(2) isotope labeling, and density functional theory calculations. The result confirmed that increasing Sr(2+) concentration in the tunnels not only promoted the lattice oxygen activity, but also facilitated the generation of more oxygen vacancy defects, thus considerably improving the catalytic activity of OMS-2" |
| Keywords: | Catalytic oxidation Manganese oxide Oxygen vacancy Sr doping Volatile organic compounds; |
| Notes: | "PubMed-not-MEDLINENi, Chunlan Hou, Jingtao Wang, Zongwei Li, Yuanzhi Ren, Lu Wang, Mingxia Yin, Hui Tan, Wenfeng eng Research Support, Non-U.S. Gov't Netherlands 2020/06/03 J Hazard Mater. 2020 Nov 5; 398:122958. doi: 10.1016/j.jhazmat.2020.122958. Epub 2020 May 24" |
