Oxidation with encapsulated co-catalyst
AssigneeMonsanto Company
InventorTimothy R. Felthouse
Life of this patent
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Abstract
Processes are given for which a microcrystalline support having a noble metal located within its pores, is used as a permselective catalyst to oxidize formaldehyde and similar materials while avoiding poisoning by N-phosphonomethylamines. The permselective catalyst can be used as a co-catalyst with activated carbons in the oxidation of N-phosphonomethyliminodiacetic acid to N-phosphonomethylglycine.
Claims11
The method of oxidizing formaldehyde or formic acid in the presence of an N-phosphonomethyl amine which comprises contacting a liquid solution containing formaldehyde or formic acid and an N-phosphonomethylamine with oxygen in the presence of a catalyst comprising a microporous support with a noble metal oxidation catalyst located within the pores of such support, with the support being a microporous acid resistant aluminosilicate having an Si to Al ratio of at least 2 and with the microporous support being selectively permeable so as to inhibit contact of the N-phosphonomethylamine with the noble metal therein, at a temperature sufficiently elevated to effect the desired oxidation.
The method of oxidizing formaldehyde of formic acid with a noble metal catalyst in a waste stream which comprises contacting a waste stream containing formaldehyde or formic acid with oxygen in the presence of a catalyst comprising a microporous support with a noble metal catalyst located within the pores of such support, with the support being a microporous, acid resistant aluminosilicate having an Si to Al ratio of at least 2, and with the waste stream also containing a poison for the noble metal and the microporous support being selectively permeable so as to inhibit contact of the poison with the metal therein.
Dependencies are inferred from the claim text.