Acidic catalyst
AssigneeBoard of Supervisors of Louisiana State University and Agricultural and Mechanical College
InventorsJames J. Spivey, Kunlun Ding, Swarom Kanitkar
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Abstract
Methods of preparing an acidic catalyst are disclosed that include heating a metal halide to produce a vapor phase metal halide, contacting an initial support material with the vapor phase metal halide in a reaction vessel causing a first chemical reaction and producing an intermediate acidic catalyst, contacting the intermediate acidic catalyst with HBr causing a second chemical reaction and producing an acidic catalyst product which is both more acidic than the intermediate acidic catalyst and more acidic than the initial support material.
Claims20
A method of preparing an acidic catalyst comprising:
- a. heating a metal halide to produce a vapor phase metal halide;
- b. contacting an initial support material with the vapor phase metal halide in a reaction vessel thereby causing a first chemical reaction and thereby producing an intermediate acidic catalyst;
- c. wherein the initial support material is selected from an aluminum oxide based catalyst and a silicon oxide based catalyst;
- d. wherein the vapor phase metal halide is selected from aluminum trichloride and aluminum tribromide;
- e. contacting the intermediate acidic catalyst with HBr thereby causing a second chemical reaction and thereby producing an acidic catalyst product;
- f. wherein the acidic catalyst product is more acidic than the intermediate acidic catalyst;
- g. wherein the acidic catalyst product is more acidic than the initial support material;
- and
- h. wherein the HBr is gas phase HBr.
A method of preparing an acidic catalyst comprising:
- a. heating a metal halide to produce a vapor phase metal halide;
- b. contacting an initial support material with the vapor phase metal halide in a reaction vessel thereby causing a first chemical reaction and thereby producing an intermediate acidic catalyst;
- c. wherein the initial support material is selected from an aluminum oxide based catalyst and a silicon oxide based catalyst;
- d. wherein the vapor phase metal halide is selected from aluminum trichloride and aluminum tribromide;
- e. contacting the intermediate acidic catalyst with between 0.1% and 20% gas phase HBr in an inert gas thereby causing a second chemical reaction and thereby producing an acidic catalyst product.
A method of preparing an acidic catalyst comprising:
- a. heating a metal halide to produce a vapor phase metal halide;
- b. contacting an initial support material with the vapor phase metal halide in a reaction vessel thereby causing a first chemical reaction and thereby producing an intermediate acidic catalyst;
- c. wherein the initial support material is selected from an aluminum oxide based catalyst and a silicon oxide based catalyst;
- d. wherein the vapor phase metal halide is selected from aluminum trichloride and aluminum tribromide;
- e. contacting the intermediate acidic catalyst with HBr thereby causing a second chemical reaction and thereby producing an acidic catalyst product;
- f. wherein the HBr is gas phase HBr;
- and
- g. wherein the heating of the metal halide to produce the vapor phase metal halide and the contacting the intermediate acidic catalyst with HBr are separate sequential steps.
Dependencies are inferred from the claim text.