Physicochemical Properties and NH3-SCR Performance of Supported CeO2-MnOx Mixed Oxides Catalysts

被引：0

作者：

Mousavi, Seyed Mahdi ^{[1
]}

Panahi, Parvaneh Nakhostin ^{[2
]}

Niaei, Aligholi ^{[3
,4
]}

机构：

[1] Univ Kashan, Fac Chem, Kashan, Iran

[2] Univ Zanjan, Fac Sci, Dept Chem, Zanjan, Iran

[3] Univ Tabriz, Dept Chem Engn, Reactor & Catalyst Res Lab, Tabriz, Iran

[4] Univ sakarya, Fac Sci, Dept Phys, Sakarya, Turkiye

来源：

RUSSIAN JOURNAL OF APPLIED CHEMISTRY | 2024年 / 97卷 / 02期

关键词：

cerium; mixed oxide; ZSM-5; TiO2; SAPO-34; NH3-SCR; NO REDUCTION; NH3; MN; OPTIMIZATION; OXIDATION; SCR; FE; CO; NANOCATALYSTS;

D O I：

10.1134/S1070427224020034

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

CeO2-MnOx mixed oxides supported on different carriers (ZSM-5, TiO2, and SAPO-34) were prepared by the sol-gel combustion method and evaluated for the selective catalytic reduction of NO with NH3. The physicochemical properties of the samples were determined by using XRD, TEM, N-2 adsorption (BET method), H-2-TPR, and NH3-TPD. The Ce-Mn/TiO2 exhibited a higher NO conversion than Ce-Mn/ZSM-5 in the 100-200 degrees C temperature range, but the NO conversion of Ce-Mn/ZSM-5 increases with reaction temperature (being the N-2 selectivity close to 100%) whereas, for Ce-Mn/TiO2, the N-2 selectivity extremely decreases. The reducibility and surface acidity of samples seems to explain the catalytic performance. Thus, although the reducibility of Ce-Mn/ZSM-5 and Ce-Mn/TiO2 was similar, the large number of surface acid sites of Ce-Mn/ZSM-5 could be a plausible reason for its excellent SCR activity. In fact, the superior SCR activity of Ce-Mn/ZSM-5 (94% NO conversion and 95% N-2 selectivity at 300 degrees C) is related to the presence of well-dispersed Ce-Mn mixed oxide nanoparticles, high reducibility, and a large number of surface acid sites.

引用

页码：211 / 221

页数：11

共 34 条

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