Method of preparing isomerization catalyst composition
AssigneePhillips Petroleum Company
InventorsAn-hsiang Wu, Charles A. Drake, Ralph J. Melton
Life of this patent
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Abstract
A Group VIII metal- and chloride-containing composition (effective as an alkane/cycloalkane isomerization catalyst) is prepared by a method which comprises mixing at least one aluminum- and chlorine-containing compound (preferably AlCl.sub.3) with a solid material containing at least one Group VIII metal (Pt and/or Pd and/or Ni) and alumina, heating the obtained solid mixture in an inert gas, and then treating the solid mixture with a gas mixture comprising hydrogen gas and HCl and/or chloroalkane (such as CCl.sub.4).
Claims19
A method of preparing a solid Group VIII metal-and chlorine-containing composition which comprises:
- (1) mixing at least one aluminum-and chlorine-containing compound selected from the group consisting of aluminum chloride and alkyl aluminum chlorides with a solid material which comprises (I) at least one Group VIII metal selected from the group consisting of platinum, palladium and nickel and (ii) alumina as the support, wherein said solid material has been prepared by a method comprising:
- (a) impregnating an alumina material with at least one compound of a Group VIII metal selected from the group consisting of platinum, palladium and nickel;
- (b) calcining the impregnated alumina obtained in step (a) at a temperature of about 300.degree.-650.degree. C. for a time period of at least about 10 minutes;
- and
- (c) treating the calcined material obtained in step (b) with a reducing gas comprising free hydrogen at a temperature of about 200.degree.-550.degree. C. for a time period of at least about 10 minutes, and wherein the weight ratio of said at least one aluminum- and chlorine-containing compound to said solid material used in step (1) is in the range of about 0.05:1 to about 1:1;
- (2) heating the mixture obtained in step (1) in a substantially inert gas atmosphere at a temperature of about 450.degree.-700.degree. C. for a time period of at least about 10 minutes;
- and
- (3) treating the material obtained in step (2) with a gas mixture comprising hydrogen gas and at least one chlorine-containing compound selected from the group consisting of hydrogen chloride and chloroalkanes, at a temperature of about 50.degree.-700.degree. C. for a time period of at least about 10 minutes.
Dependencies are inferred from the claim text.