Enhanced Sulfur Tolerance of Ceria-Promoted NOx Storage Reduction (NSR) Catalysts: Sulfur Uptake, Thermal Regeneration and Reduction with H2(g)

被引：11

作者：

Say, Zafer ^{[1
]}

Vovk, Evgeny I. ^{[1
,2
]}

Bukhtiyarov, Valerii I. ^{[2
]}

Ozensoy, Emrah ^{[1
]}

机构：

[1] Bilkent Univ, Dept Chem, Ankara, Turkey

[2] Boreskov Inst Catalysis, Novosibirsk, Russia

来源：

TOPICS IN CATALYSIS | 2013年 / 56卷 / 11期

关键词：

NSR; NOx; SOx; Sulfur poisoning; DeNO(x); Ceria; GAS-SHIFT REACTION; IN-SITU FTIR; NO(X) STORAGE; SO2; ADSORPTION; SUPPORT; PLATINUM; ALUMINA; GAMMA-AL2O3; STABILITY;

D O I：

10.1007/s11244-013-0059-5

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

SOx uptake, thermal regeneration and the reduction of SOx via H-2(g) over ceria-promoted NSR catalysts were investigated. Sulfur poisoning and desulfation pathways of the complex BaO/Pt/CeO2/Al2O3 NSR system was investigated using a systematic approach where the functional sub-components such as Al2O3, CeO2/Al2O3, BaO/Al2O3, BaO/CeO2/Al2O3, and BaO/Pt/Al2O3 were studied in a comparative fashion. Incorporation of ceria significantly increases the S-uptake of Al2O3 and BaO/Al2O3 under both moderate and extreme S-poisoning conditions. Under moderate S-poisoning conditions, Pt sites seem to be the critical species for SOx oxidation and SOx storage, where BaO/Pt/Al2O3 and BaO/Pt/CeO2/Al2O3 catalysts reveal a comparable extent of sulfation. After extreme S-poisoning due to the deactivation of most of the Pt sites, ceria domains are the main SOx storage sites on the BaO/Pt/CeO2/Al2O3 surface. Thus, under these conditions, BaO/Pt/CeO2/Al2O3 surface stores more sulfur than that of BaO/Pt/Al2O3. BaO/Pt/CeO2/Al2O3 reveals a significantly improved thermal regeneration behavior in vacuum with respect to the conventional BaO/Pt/Al2O3 catalyst. Ceria promotion remarkably enhances the SOx reduction with H-2(g).

引用

页码：950 / 957

页数：8

共 29 条

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