| 摘要 |
The tendency of a gasoline containing unsaturated hydrocarbons to form gum is reduced by hydrogenating the gasoline in the presence of a catalyst prepared by (a) impregnating a support with a solution of a complex formed between ammonia and a substantially waterinsoluble nickel salt of an aliphatic monocarboxylic acid, and then (b) reducing the complex to elemental nickel to active the catalyst. The nickel salt used in preparing the catalyst may be nickel formate, white the catalyst support may be a Group II metal carbonate, sepiolite, calcium, barium, strontium or magnesium oxide, diatomaceous earth (or firebrick derived therefrom), silicon carbide, quartz, carbon, pumice or activated or deactivated alumina. In examples, steam cracker gasoline is hydrogenated in the presence of a supported nickel catalyst, the catalyst support being firebrick or sepiolite (with or without 1% of graphite). The supported nickel catalyst is prepared by impregnating the support with aqueous ammoniacal nickel formate solution, drying in air at 100 DEG C. and activating by heating to 250 DEG C. in a stream of nitrogen or hydrogen. For comparison purposes, the catalytic hydrogenation of steam cracker gasoline is described, wherein the catalyst employed is one obtained by forming a paste of nickel formate, sepiolite, graphite and water, drying at 100 DEG C., pelletting, and activating by heating to 250 DEG C. in a stream of hydrogen. Specifications 899,651 and 899,652 are referred to. |
