MnOx-pillared rectorite prepared by in situ deposition as efficient catalysts for low-temperature NH3-SCR: The influences of manganese (II) precursors

被引:16
作者
Zhang, Xianlong [1 ,2 ]
Hu, Xiaorui [1 ]
Liu, Shiwen [1 ]
Chen, Yazhong [1 ]
Jin, Shi [1 ]
Wang, Xinyu [1 ]
Wang, Junwei [3 ]
Xiao, Kesong [4 ]
Wu, Xueping [1 ]
机构
[1] Hefei Univ Technol, Sch Chem & Chem Engn, Hefei 230009, Peoples R China
[2] Hefei Univ Technol, Anhui Prov Key Lab Adv Catalyt Mat & React Engn, Hefei 230009, Peoples R China
[3] Anqing Normal Univ, Coll Chem & Chem Engn, Anqing 246011, Peoples R China
[4] Hefei Univ Technol, Instrumental Anal Ctr, Hefei 230009, Peoples R China
来源
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2022年 / 10卷 / 02期
基金
中国国家自然科学基金;
关键词
Low-temperature NH3-SCR; Rectorite; Manganese (II) precursors; In situ deposition; NO REDUCTION; PERFORMANCE; NH3; MECHANISM; OXIDE; ZR;
D O I
10.1016/j.jece.2022.107318
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
MnOx pillared rectorite (REC) catalysts (10 wt% based upon Mn element and the mass of clay) were prepared by in situ deposition using different manganese (II) precursors, e.g., Mn(NO3)(2), Mn(Ac)(2), MnSO4 and MnCl2 to react with KMnO4, respectively. Unsupported MnOx was also prepared through reaction between Mn(Ac) 2 and KMnO4 solution. The samples were characterized by XRD, SEM, low-temperature N-2 adsorption, HRTEM, H-2-TPR, NH3-TPD, TPSR and XPS. And the deNOx performances for low-temperature NH3-SCR were evaluated. The results showed that the unsupported amorphous MnOx had much higher deNOx performance than different MnO2 phases. For the MnOx pillared REC catalysts, deNO(x) performances decreased in the order of Mn10/REC-Ac- > Mn10/REC-Cl- > Mn10/REC-SO42- > Mn10/REC-NO3-. The Mn10/REC-AC(-) MnOx-Ac-/REC showed the best redox properties, richest weak acid sites and best dispersion of MnOx and content of Mn4+, which contributed to its high activity. Moreover, even under working conditions with GHSV up to 105,000 h(-1), high deNOx performance and good stability was also observed for Mn10/REC-Ac- catalyst.
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页数:10
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