Reduction catalyst with modified rhodium structure

Details Reduction catalyst with modified rhodium structure Reduction catalyst with modified rhodium structure

1990-01-08

1992-02-04

Garvin, Patrick P.

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

Catalyst or precursor therefor

Organic compound containing

502200, 502201, 502230, 502325, 502334, B01J 3100

Patent

active

050860267

ABSTRACT:
Method of enhancing the catalytic effectiveness of rhodium to reduce nitric oxides: (a) preparing a polymer modifier (molecular weight of 500-50,000) by controllably reacting amine [mono-2-hydroxyl ethyl amine and di-2-hydroxy ethyl amine] with epoxy resin (two or more epoxide groups per molecule) to form a soluble adduct and adding to the adduct a solvent to form a homogeneous amino polymer solution; (b) coating a granular support material (gamma alumina) with rhodium chloride and/or rhodium nitrate compounds; and (c) mixing the coated support material with added amino polymer solution to the support material either prior to or subsequent to step (b) and heating the mixture of polymer solution, support material, and rhodium chloride and/or rhodium nitrate compounds to evaporate the solvent and to decompose and eliminate the polymer, leaving the coated support material with rhodium in a morphologically changed condition devoid of amino polymer but having enhanced catalytic effectiveness for promoting reduction of nitric oxide.

REFERENCES:
patent: 4020013 (1977-04-01), Brennan
patent: 4098727 (1978-07-01), Haag et al.
patent: 4172047 (1979-10-01), Gandhi et al.
patent: 4179402 (1979-12-01), Kim et al.
patent: 4179403 (1979-12-01), Kim et al.
patent: 4274981 (1981-06-01), Suzuki et al.
patent: 4306085 (1981-12-01), Kim et al.
patent: 4526884 (1985-07-01), Tsou et al.

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