Enhanced catalytic ozonation over reduced spinel CoMn2O4 for NOx removal: active site and mechanism analysis. Issue 116 (14th December 2016)

• Record Type: Journal Article
• Authors: Zhao, Wenkai; Zhong, Qin; Ding, Jie; Deng, Zhiyong; Guo, Lina; Song, Fujiao
• Is Part Of: RSC advances. Volume 6:Issue 116(2016)
• Page Start: 115213
• Page End: 115221
• Publication Date: 2016-12-14
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra21544k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this paper, CO atmosphere reduced cobalt manganate (CoMn2 O4 /CO), prepared by a hydrothermal method, was successfully utilized in catalytic ozonation for NO x removal. Abstract : In this paper, CO atmosphere reduced cobalt manganate (CoMn2 O4 /CO), prepared by a hydrothermal method, was successfully utilized in catalytic ozonation for NO x removal. CoMn2 O4 /CO shows higher activity (84%) than CoMn2 O4 /air (82%), Co3 O4 (76%) and Mn2 O3 (76%). Hydroxyl radicals (·OH) have been detected in the catalytic ozonation process, which has been confirmed to determine the catalytic performance of NO x removal. Compared to Co3 O4 and Mn2 O3, CoMn2 O4 exhibits more surface hydroxyl groups and oxygen vacancies, both of which are critical for the ·OH generation. More importantly, more oxygen vacancies are generated when the CoMn2 O4 is calcined in the reduced atmosphere. These oxygen vacancies benefit the adsorption of sufficient H2 O to yield active surface –OH on the catalyst surface, promoting the adsorption of O3 on the surface –OH and thus the production of ·OH radicals. A possible mechanism for the catalytic ozonation of NO x was proposed.