NOx reduction compositions for use in FCC processes
a technology of nox reduction composition and composition, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal-oxide/metal-hydroxide catalyst, etc., can solve the problem of nosub>x/sub>evolution from the regenerator, 300%), and undesirable gas evolution, etc., to achieve the effect of superior nox control performan
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example 1
[0027] An amorphous silica alumina particulate support containing 6 wt. % silica was impregnated with a sodium carbonate solution, dried and calcined to achieve a 3.6 wt. % Na content measured as Na2O based on the weight of the silica alumina The Na-containing silica alumina particles were then impregnated with a solution of cerium nitrate and then dried to achieve a ceria content of about 1 wt. % based on the weight of the silica alumina particles. The Ce-containing composition was then impregnated with a silver nitrate solution to achieve a silver content of about 5 wt. % (oxide basis) based on the weight of the silica alumina particles. The impregnated particles were then dried and calcined at about 704° C. to form a particulate composition in accordance with the invention.
example 2
[0028] An amorphous silica alumina particulate support containing 6 wt. % silica was impregnated with a sodium carbonate solution, dried and calcined to achieve a 6 wt. % Na content measured as Na2O based on the weight of the silica alumina. The Na-containing silica alumina particles were then impregnated with a solution of cerium nitrate and then dried to achieve a ceria content of about 22 wt. % based on the weight of the silica alumina particles. The Ce-containing composition was then impregnated with a copper nitrate solution to achieve a copper content of about 2 wt. % (oxide basis) based on the weight of the silica alumina particles. The impregnated particles were then dried and calcined at about 704° C. to form a particulate composition in accordance with the invention.
example 3
[0029] The 152 g of the composition of example 1 was admixed with 2908 grams of a commercial FCC catalyst (Grace Davison Orion® 842 equilibrium catalyst (ECAT)) and 10 g of a combustion promoter (Grace Davison CP-5). The admixture was then used to crack a hydrocarbon feedstock containing 0.3 wt. % nitrogen in a DCR pilot plant FCC unit. The cracking was performed at a 75% conversion rate and 1000 g / hr catalyst feed rate. As a control example, the same catalyst admixture was run without the composition of example 1. The NOx emission measured from the FCC unit regenerator was 65% less when the composition of example 1 was used compared to the control example.
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