Activity enhancement of SnO2-doped Ga2O3-Al2O3 catalysts by coexisting H2O for the selective reduction of NO with propene

被引：66

作者：

Haneda, M ^{[1
]}

Kintaichi, Y ^{[1
]}

Hamada, H ^{[1
]}

机构：

[1] Natl Inst Mat & Chem Res, Higashi Ku, Tsukuba, Ibaraki 3058565, Japan

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 1999年 / 20卷 / 04期

关键词：

nitrogen monoxide; selective reduction; propene; SnO(2)-Ga(2)O(3)-Al(2)O(3); sol-gel method; H(2)O;

D O I：

10.1016/S0926-3373(98)00117-9

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：

Catalytic reduction of NO by propene in the presence of oxygen was studied over SnO(2)-doped Ga(2)O(3)-Al(2)O(3) Prepared by sol-gel method. Although SnO(2)-doped Ga(2)O(3)-Al(2)O(3) gave lower NO conversion than Ga(2)O(3)-Al(2)O(3) in the absence of H(2)O, the activity was enhanced considerably by the presence of H2O and much higher than that of Ga(2)O(3)-Al(2)O(3) The presence of SnO(2) and Ga(2)O(3)-Al(2)O(3) species having intimate Ga-O-Al bondings was found to be essential for the promotional effect of H(2)O. The promotional effect of H(2)O was interpreted by the following two reasons. The first one is the removal of carbonaceous materials deposited on the catalyst surface by H(2)O. The other is the selective inhibition by H(2)O of the reaction steps resulting in propene oxidation to CO(x) without reducing NO. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：289 / 300

页数：12

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