Optimization of cesium and potassium promoter loading in alkali-doped Zn0.4Co2.6O4|Al2O3 catalysts for N2O abatement

被引：13

作者：

Ciura, Klaudia ^{[1
]}

Grzybek, Gabriela ^{[1
]}

Wojcik, Sylwia ^{[1
]}

Indyka, Paulina ^{[1
]}

Kotarba, Andrzej ^{[1
]}

Sojka, Zbigniew ^{[1
]}

机构：

[1] Jagiellonian Univ, Fac Chem, Ingardena 3, PL-30060 Krakow, Poland

来源：

REACTION KINETICS MECHANISMS AND CATALYSIS | 2017年 / 121卷 / 02期

关键词：

Alkali promotion; Decomposition of nitrous oxide; Supported catalyst; Cobalt spinel; Co3O4; COBALT SPINEL CATALYST; NITROUS-OXIDE; ACTIVE PHASE; DIRECT DECOMPOSITION; DEN(2)O ACTIVITY; CO3O4; PERFORMANCE; STABILITY; OXYGEN; TEMPERATURE;

D O I：

10.1007/s11144-017-1188-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of potassium or cesium doped Zn0.4Co2.6O4|Al2O3 catalysts with different alkali loadings were prepared, characterized with respect to chemical composition (XRF), structure (XRD, RS) morphology (TEM), and the alkali promoter thermal stability. A strong beneficial effect on the deN(2)O activity of the Zn0.4Co2.6O4|Al2O3 catalyst (decrease in the T (50%) by about 80 A degrees C) was observed for both promoters at different surface coverages. It was found that in comparison to a rather narrow range of optimal cesium loading (0.5-2 atoms/nm(2)) a comparable promotional effect of potassium doping was observed for a slightly wider surface concentrations (0.5-3 atoms/nm(2)). Such difference was attributed to surface dispersion of potassium over the alumina support and the spinel active phase, while cesium was found to be located mainly on the spinel phase. For practical applications, the superiority of potassium over cesium consist in fact that a similar beneficial effect is associated with much higher thermal stability in the temperature range of the catalyst deN(2)O operation and lower price of the promoter precursor.

引用

页码：645 / 655

页数：11

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