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Activation by sintering of Pt-beta catalysts in deNOx HC-SCR.: Structure-activity relationships

被引：19
作者：
García-Cortés, JM
Pérez-Ramírez, J
Illán-Gómez, MJ
de Lecea, CSM
机构：
[1] Univ Alicante, Dept Inorgan Chem, E-03080 Alicante, Spain
[2] Norsk Hydro AS, Oil & Energy Res Ctr, N-3907 Porsgrunn, Norway
来源：
CATALYSIS COMMUNICATIONS | 2003年 / 4卷 / 04期
关键词：
Pt; beta; de-NOx; SCR; C3H6; structure sensitivity; particle size; sintering; activation;
D O I：
10.1016/S1566-7367(03)00029-3
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：
The effect of the platinum particle size on the selective catalytic reduction of NOx with C3H6 over Pt-beta has been investigated. The structure sensitivity of the lean deNO(x) reaction towards the platinum phase has been confirmed and a linear correlation between the TOF and the platinum particle size has been derived. Based on our results, it seems that key elements of structure sensitivity in HC-SCR are the NO dissociation on Pt(1 0 0) planes and Pt-O clean-off by the hydrocarbon. These steps are more easily performed on large Pt particles, i.e., in Pt-catalysts with low metal dispersions. On the other hand, the independence of the Pt(1 0 0)/Pt(1 1 1) ratio with particle size explains the similar N-2 selectivity presented along all the samples (similar to35%). (C) 2003 Elsevier Science B.V. All rights reserved.
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页码：165 / 170
页数：6
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