Publication

Study of the reduction of nitrogen oxides with CO and H2 on Pt-Mo catalysts in the oxidizing range

Albert Renken
1998
Journal Articles

Abstract

The redn. of NOx with CO and H2 on Pt-Mo/a-Al2O3 catalysts as an alternative for Pt-Rh catalysts was studied for exhaust gas purifn. in lean-mixed engines in oxidizing range. The NOx content has a significant influence on the catalyst activity. The H2/O2 reaction is complete at .apprx.70 Deg in absence of NOx. A NOx content of 0.1% results in an increase of the NOx decompn. reaching a max. of 80% at .apprx.90-120 Deg and a decrease at higher temps. (16% at .apprx.200 Deg). NOx was not reduced by CO at the given conditions and CO inhibited the NO/H2 and the O2/H2 reaction. The activities of the Pt-Mo-catalysts were compared with other 3-way catalysts contg. 0.2% Pt, 0.7% Mo, and 0.1% Cu, Ni, or Co. A significant increase of the NOx reaction rate was reached by the Co-contg. catalyst at presence of 0.3-0.6% CO in the exhaust gas. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/cb6d8a38-53c6-4057-859f-76ba95fd4500

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Albert Renken
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/cb6d8a38-53c6-4057-859f-76ba95fd4500

About this result

Related concepts (29)

Heterogeneous catalysis

Heterogeneous catalysis is catalysis where the phase of catalysts differs from that of the reactants or products. The process contrasts with homogeneous catalysis where the reactants, products and catalyst exist in the same phase. Phase distinguishes between not only solid, liquid, and gas components, but also immiscible mixtures (e.g. oil and water), or anywhere an interface is present. Heterogeneous catalysis typically involves solid phase catalysts and gas phase reactants.

Heterogeneous gold catalysis

Heterogeneous gold catalysis refers to the use of elemental gold as a heterogeneous catalyst. As in most heterogeneous catalysis, the metal is typically supported on metal oxide. Furthermore, as seen in other heterogeneous catalysts, activity increases with a decreasing diameter of supported gold clusters. Several industrially relevant processes are also observed such as H2 activation, Water-gas shift reaction, and hydrogenation. No gold-catalyzed reaction has been commercialized.

Diesel exhaust

Diesel exhaust is the gaseous exhaust produced by a diesel type of internal combustion engine, plus any contained particulates. Its composition may vary with the fuel type or rate of consumption, or speed of engine operation (e.g., idling or at speed or under load), and whether the engine is in an on-road vehicle, farm vehicle, locomotive, marine vessel, or stationary generator or other application. Diesel exhaust is a Group 1 carcinogen, which causes lung cancer and has a positive association with bladder cancer.

Related publications (1)

Study of the reduction of nitrogen oxides with CO and H2 on Pt-Mo catalysts in the oxidizing range

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