Catalyst for production of aromatic hydrocarbons and process for preparation
AssigneeElf France
InventorsJean-Rene Bernard, Michele Breysse
Life of this patent
Estimating the term…
Abstract
Monofunctional dehydrocyclization catalyst of paraffins, characterized in that it contains: 0.1 to 1.5% platinum, o.1 to 1.5% rhenium incorporated in the form of carbonyl, a small proportion of sulphur introduced by a sulphur compound reducible or decomposable by hydrogen such that the ratio x of the number of sulphur atoms to the number of platinum and rhenium atoms deposited on the catalyst be comprised between 0.05 and 0.6, the carrier being constituted by a zeolitic crystalline aluminosilicate compensated in more than 90% by alkaline cations having a pore diameter of more than 6.5 Angstroms.
Claims32
A process for preparing a bimetallic catalyst for the dehydrocyclization of paraffins comprising a carrier comprised of a zeolitic crystalline aluminosilicate exchanged with more than 90% of alkali metal cations and having a pore diamter larger than 6.5 Angstroms;
- 0.1 to 1.5% platinum;
- 0.1 to 1.5% rhenium obtained from rhenium carbonyl, the ratio of the rhenium/platinum varying with the pressure of use;
- a small amount of sulphur such that the ratio x of the number of sulphur atoms to platinum and rhenium atoms is from betweeon about 0.05 and 0.6, said process comprising the impregnating steps carried out in any desired order
- (a) charging the carrier with rhenium by sublimation of rhenium carbonyl;
- (b) impregnating the carrier with an aqueous solution or water soluble complex of platinum;
- (c) incorporating sulphur into the carrier by contacting with a sulphur containing compound;
- (d) the impregnated carrier having received the charges of rhenium carbonyl, platinum complex, and sulphur compound being then dried, optionally calcined, and reduced by hydrogen at a temperature from about 300.degree. C. to 500.degree. C. prior to use.
A process for making a bimetallic catalyst for the dehydrocyclization of paraffins, comprising a carrier comprised of a zeolitic crystalline aluminosilicate exchanged with more than 90% of alkali metal cations and having a pore diameter larger than 6.5 Angstroms;
- 0.1 to 1.5% platinum;
- 0.1 to 1.5% rhenium obtained from rhenium carbonyl, the ratio of the rhenium/platinum varying with the pressure of use;
- a small amount of sulphur such that the ratio x of the number of sulphur atoms to platinum and rhenium atoms is from between about 0.05 and 0.6, said process comprising the impregnating steps carried out in any order desired:
- (a) charging the carrier with rhenium by impregnation with a solution of rhenium carbonyl in acetone;
- (b) impregnating the carrier with an aqueous solution or water soluble complex of platinum;
- (c) impregnating sulphur by impregnation of the carrier with a solution of a sulphur containing compound;
- and
- (d) after the impregnation steps, drying, heat treating and reducing the impregnated carrier with hydrogen at a temperature between about 300.degree. C. and 550.degree. C. prior to use.
Dependencies are inferred from the claim text.