Effect of Mg, Ca and Ba on the Pt-catalyst for NOx storage reduction

被引：36
作者：
Basile, F.
Fomasari, G.
Grimandi, A.
Livi, M.
Vaccari, A.
机构：
[1] Univ Bologna, Dipartimento Chim Ind & Mat, ALMA MATER STUDIORIUM, I-40136 Bologna, Italy
[2] INCA, I-30175 Venice, Italy
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2006年 / 69卷 / 1-2期
关键词：
NOx storage reduction; NSR; Ba; Ca; Mg; Pt; gamma Al2O3; SO2; poisoning;
D O I：
10.1016/j.apcatb.2006.05.017
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：
A set of catalysts was prepared to improve the activity of the Ba-Pt/gamma Al2O3 catalyst in the NOx storage reduction (NSR), by replacing Ba with Mg or Ca, but maintaining constant the moles of alkaline-earth element in order to keep the number of storage sites constant. The catalysts were prepared by impregnating first 1.0 wt.% Pt and then the alkaline-earth cations (Ca, Mg and/or Ba) on a commercial gamma Al2O3 (Sasol, D). Tests were carried out in a wide temperature range (100-500 degrees C), thus evidencing the specific role of each different alkaline-earth element. Both the activity and the resistance to SO2 poisoning in the catalysts were different and the alkaline-earth cation with lower electronegativity registered the strongest deactivation. A new catalyst with high activity and resistance to deactivation by SO2 was obtained by co-impregnating Ba and Mg on gamma Al2O3 (1.5Mg8.5Ba-1Pt/gamma Al2O3). (c) 2006 Elsevier B.V. All rights reserved.
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页码：58 / 64
页数：7
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