文献类型：期刊文献

英文题名：Enhanced activity and water resistance of hierarchical flower-like Mn-Co binary oxides for ammonia-SCR reaction at low temperature

作者：Zhu, Yujie[1];Xiao, Xixi[1];Wang, Jitong[1,2];Ma, Cheng[1];Jia, Xianfeng[1,3];Qiao, Wenming[1,2];Ling, Licheng[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China;[3]Tangshan Normal Univ, Dept Chem, Tangshan 063000, Peoples R China

年份：2021

卷号：569

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20213510831825);WOS:【SCI-EXPANDED(收录号:WOS:000759710000005)】；

基金：This work is partly supported by the National Natural Science Foundation of China (No. 21978097, U1710252), CAS Key Laboratory of Carbon Materials (No: KLCMKFJJ2001), the Fundamental Research Funds for the Central Universities (222201817001, 50321041918013, 50321042017001).

语种：英文

外文关键词：Hierarchical flower; Mn-Co oxides; NH3-SCR; Enhanced activity; in situ DRIFTS

摘要：Manganese-based catalysts applied for selective catalytic reduction of NOx with ammonia (NH3-SCR) still exist certain drawbacks, including narrow operating window, weak water resistance and low selectivity. A number of novel Mn-Co binary oxides with hierarchical flower morphology are synthesized through solvothermal to boost the catalytic performance and H2O tolerance. The formation of the hierarchical flower morphology with high specific surface area could provide short diffusion channels and accessible adsorption sites for NH3 and NO species. Moreover, strong interaction between Mn and Co oxides endows the catalyst with enhanced Lewis acid sites, which could preferentially adsorb NH3 species than H2O. Therefore, the catalyst Mn-Co-F (1:1) presents superior activity with NOx conversion and N-2 selectivity > 80% within 60-320 degrees C, together with remarkable water resistance of 99% NOx conversion under the condition of 15 vol% H2O. The reaction process over Mn-Co-F catalyst follows Langmuir-Hinshelwood mechanism below 200 degrees C and Eley-Rideal mechanism above 200 degrees C, respectively. This study creates a unique route for designing high-efficiency Mn-based catalysts used for the NH3-SCR process.