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Unravelling the nature of the active species as well as the Mn doping effect over gamma-Al_(2)O_(3) catalyst for eliminating AsH_(3) and PH_(3)

查看全文 作　　者：Bowen [1]Xu;Jiaxin [1]Qu;Xueqian [1]Wang;Langlang [1]Wang;Yu [1]Pu;Ping [1]Ning;Yibing [1]Xie;Yixing [1]Ma;Qiang [2]Ma 高影响力作者 机构地区：[1]Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;[2]School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2024年第2期,共13页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Nos.51868030,52070090,52100122,22266019,and 21876071);the Science and Technology Planning Project of Yunnan Province (Nos.202001AU070031,202101BE070001-030,and 202101BC070001-009);Applied Basic Research Program of Yunnan Province (No.2019FD043)。 摘　　要：To investigate the enhancing effect of Mn on the performance of simultaneous catalytic oxidation of AsH_(3)and PH_(3)by CuO-Al_(2)O_(3)in a reducing atmosphere under micro-oxygen conditions,Cu-Mn modifiedγ-Al_(2)O_(3)catalysts were prepared.The characteristics of the catalysts showed that Mn reduced the crystallinity of the active CuO component,increased the number of oxygen vacancies and acidic sites on the catalyst surface,enhanced the mobility of surface oxygen,and the interaction between copper and manganese promoted the redox cycling ability of the catalysts and improved their oxidation performance,which increased the conversion frequency(TOF)by 2.54×10^(-2)to 3.07×10^(-2)sec^(-1).On the other hand,the introduction of Mn reduced the production of phosphate and As_(2)O_(3)on the catalyst surface by30.96%and 44.9%,which reduced the coverage and inerting of the active sites by phosphate and As_(2)O_(3),resulting in an 8 hr(6 hr)improvement in the stability of PH_(3)(AsH_(3))removal. 关 键 词：AsH_(3)-PH_(3)removal Oxygen activation Mn doping Stability enhancement
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