Characteristics of Pt/WO3/CeO2/ZrO2 Catalysts for catalytic reduction of NO by CO

被引：58

作者：

Zhu, Hai-ou ^{[1
]}

Kim, Jeong-Rang ^{[1
]}

Ihm, Son-Ki ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Taejon 305701, South Korea

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2009年 / 86卷 / 1-2期

关键词：

Pt; CeO2; ZrO2; CeO2-ZrO2; Precipitation; WO3; NO plus CO reaction; Excess oxygen; Acidity; Pt dispersion; OXYGEN STORAGE CAPACITY; CEO2-ZRO2 MIXED OXIDES; SELECTIVE REDUCTION; TUNGSTATED ZIRCONIA; BEHAVIOR; PD; METHANE; RH; SUPPORTS; SCR;

D O I：

10.1016/j.apcatb.2008.07.024

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：

Various supported Pt catalysts (Pt/WO3/CeO2/ZrO2; Pt/ZrO2, Pt/CeO2, Pt/CeZrO, Pt/WO3/ZrO2, and Pt/WO3/CeZrO) were prepared and characterized, and their characteristics of catalytic reductions of NO by CO with or without oxygen were investigated. TPR and CO-TPD showed that Pt/CeO2 and Pt/CeZrO could be easily reduced by CO while the reduction by CO was inhibited with the introduction of WO3 in the Case Of Pt/WO3/CeZrO. According to NO-TPD, NO reduction could not proceed over the catalysts (Pt/WO3/CeZrO, Pt/ZrO2, Pt/WO3/ZrO2) to remain in an oxidized state even after reduction by CO, but NO reduction was possible over Pt/CeO2 and Pt/CeZrO catalysts when reduced by CO. For NO + CO reaction without oxygen, those easily reducible catalysts (Pt/CeO2 and Pt/CeZrO) exhibited better catalytic performances. With excess oxygen, however, Pt/WO3/CeZrO and Pt/WO3/ZrO2 catalysts exhibited higher NO conversions to N-2 and N2O especially at a low temperature. The acidity from ZrO2 and WO3 in Pt/WO3/CeO2/ZrO2 catalysts should play an important role on their NO conversion only in the presence of excess oxygen. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：87 / 92

页数：6

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