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.

引用

页码：165 / 170

页数：6

共 25 条

[1] NO reduction by CH4 over well-structured Pt nanocrystals supported on γ-Al2O3 [J].