Zeolite catalyst with chromium for the production of gasolines with low aromatic content and high octane number
AssigneeIntevep, S.A.
InventorsTrino Romero, Nelson Martinez
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Abstract
A catalyst for production of high octane number gasoline having low aromatic content from a hydrocarbon feedstock containing n-paraffins includes a zeolite composition containing chromium in an amount of between about 0.1% to about 1.0% by weight of the catalyst, said chromium being located at acidic sites of said zeolite composition whereby aromatic forming reactions are inhibited. The catalyst is provided according to a process including sequential impregnation so as to position chromium at the acidic sites as desired.
Claims9
A process for preparing a chromium containing zeolite catalyst for producing high octane number gasoline products having low aromatic content from a hydrocarbon feedstock containing n-paraffins, the process consisting essentially of the steps of:
- providing a zeolite composition;
- providing a solution of water soluble chromium salt in water having a chromium ion concentration sufficient to provide a desired concentration of chromium in said final catalyst of between about 0.1 to 1.0 wt.%;
- providing a solution of water soluble ammonium salt in water wherein said ammonium solution has an ammonium ion concentration greater than said chromium ion concentration of said chromium solution;
- impregnating said zeolite composition with said ammonium solution to provide an ammonium impregnated zeolite;
- impregnating said ammonium impregnated zeolite with said chromium solution without intermediate treatment of the said ammonium impregnated zeolite to provide an ammonium/chromium impregnated zeolite;
- drying said ammonium/chromium impregnated zeolite;
- and
- calcining said dried zeolite so as to provide said zeolite with pockets of chromium in Cr.sup.3+ form at acidic sites of said zeolite catalyst.
Dependencies are inferred from the claim text.