Process for production of catalyst for exhaust gas cleaning

Details Process for production of catalyst for exhaust gas cleaning Process for production of catalyst for exhaust gas cleaning

1997-07-31

2000-02-15

Straub, Gary P.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Silicon containing or process of making

502 66, 502 85, 502240, 502300, 502325, 502340, 502514, 4232135, 423700, B01J 2900, B01J 3700

Patent

active

060252960

ABSTRACT:
A process is provided for the production of a catalyst useful for removing nitrogen oxides out of exhaust gases from internal combustion engines operated under lean burn conditions. The catalyst is produced by supporting at least one catalytic metal, such as platinum, iridium, rhodium, other transition metals and alkaline earth metals, as the active component on a support, such as a zeolite, by either wash-coating a solution of the catalytic metal components onto the support; evaporating off solvent from a mixture of solvent, catalyst material and support, or rapidly drying droplets of support and catalyst material containing slurry with a hot gas. The supported catalyst is activated by heating to a temperature of 150 to 300.degree. C. for a period of time sufficient to desorb catalytic material components, such as water, chlorine and ammonia, out of the pores of the catalyst that adversely affect the activity and heat resistance of the catalyst.

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