Passive SCR: The Effect of H2 to NO Ratio on the Formation of NH3 Over Alumina Supported Platinum and Palladium Catalysts

被引：0

作者：

Adams, Emma Catherine ^{[1
]}

Skoglundh, Magnus ^{[1
]}

Gabrielsson, Par ^{[2
]}

Carlsson, Per-Anders ^{[1
]}

机构：

[1] Chalmers Univ Technol, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden

[2] Haldor Topsoe Res Labs, POB 213, DK-2800 Lyngby, Denmark

来源：

TOPICS IN CATALYSIS | 2016年 / 59卷 / 10-12期

关键词：

Passive SCR; DRIFT spectroscopy; NH3; formation; AMMONIA GENERATION; REACTION PATHWAYS; NO-H-2; REACTION; NITRIC-OXIDE; REDUCTION; PD/AL2O3; MECHANISM; DRIFTS; SYSTEM;

D O I：

10.1007/s11244-016-0576-0

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

We investigate the relationship between the H-2: NO ratio and NH3 formation over alumina supported Pt and Pd catalysts. By kinetic studies and in situ infrared spectroscopy, we report that NH3 formation is not only sensitive to the catalyst formulation but equally dependent on the feed gas composition and temperature. Specifically, we identify that hydrogen plays an important role in the dissociation of NO at low temperature. We also show that the support material itself plays a vital role in the ammonia formation mechanism due to the redox behaviour of NO adsorption at low temperature. This was unexpected as the noble metal is generally considered to be the active phase for the reaction of NO and H-2.

引用

页码：970 / 975

页数：6

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