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US 4,382,023 AGranted
Catalyzed combustion in cracking catalyst
AssigneeChevron Research Company
InventorBernard F. Mulaskey
Life of this patent
Estimating the term…
Abstract
The volume ratio of CO.sub.2 /CO in cracking catalyst regenerator flue gas is increased without adverse effect on cracking conversion and selectivity by employing a chromium oxidation catalyst at a high concentration in a small proportion of particles circulating in a cracking system.
Claims3
A composition of matter comprising a mixture of
- (a) from 95 to 99.55 weight percent of particles of an acidic cracking catalyst comprising silica and at least one other refractory inorganic oxide;
- and
- (b) from 0.05 to 5 weight percent of particles of an oxidation-promoting catalyst which includes greater than 10 weight percent chromium calculated as elemental metal and from 0.01 to 1 part, by weight, of tin for each part of chromium present, and further the concentration of chromium in the entire composition of matter being between 0.01 and 3.5 weight percent, calculated as elemental metal.
Dependencies are inferred from the claim text.