SU14476A1 - Method for the catalytic reduction of carbon dioxide - Google Patents

Description

Patents X9 No. 14474 and 14475 "describe methods for producing methyl alcohol and other organic compounds by reducing carbon monoxide with hydrogen in the presence of catalysts.

In the proposed method, the carbon dioxide is subjected to a reducing process in the presence of catalysts, -. As a result of the process, compounds containing oxygen, especially methyl alcohol, are formed. The very process is carried out in such a way that the mixture of carbon dioxide and hydrogen under pressure and at elevated temperatures is brought into contact with catalysts containing copper, silver or gold and, moreover, vanadium, chromium and: manganese, or similar elements 5, b and 7 groups of the periodic system, or boron, or several of these elements, or their compounds. The preparation of catalysts can be carried out in a variety of ways. You can mix catalytically active metals — copper, silver, or

gold-with the above-mentioned activators, for example, with their oxygen compounds, such as boric acid, vanadic acid, or used as catalysts, or for their preparation, simply salts of catalytically active metals mixed with oxygen compounds called activators, for example, with vanadic, chromic, manganese and boric acids. It is also possible to carry out various combinations using one or more of the above hydrogenation catalysts containing these and other activators at the same time.

Example 1. In a solution of 56 parts of potassium chromate, 50 parts of asbestos cotton are introduced; By adding a solution of 70 parts of copper nitrate on the asbestos fiber, copper chromate is precipitated. The liquid is filtered, washed, dried, loosened asbestos cotton and restored it at 200-300 ° in a stream of hydrogen. A catalyst of significant activity is obtained which, in the presence of water, can hydrogenate carbon dioxide at 320 ° under the action of hydrogen under pressure and convert it into pure methyl alcohol. Another example of a contact mass can be a mixture of oxides or carbonic compounds of copper and zinc with respect to 1 at. in, copper to 2 at. v.tsinka with / 2 m, c. chromic acid, using such a mass, is obtained, after reduction from carbon dioxide 10-iS / o and 90-85% hydrogen at 310 ° and 150 atm, to pressure a favorable yield of alcohol. Significant amounts of methyl alcohol are also formed, if one passes over the described pressure levels under these conditions, instead of the gas mixture, a mixture composed of carbon dioxide and 60-40% hydrogen. Work at higher temperatures, for example, at 400 ° and above, it is advisable to increase / and pressure.

Example 2. An aqueous solution of copper and manganese nitrate, respectively, but 91, 78 c. including copper and 55 c. manganese, diluted at the boiling point with soda. The filter cake is stirred with the addition of water to the batter, to which 150 vol. H. Pumice. With constant stirring, the mixture is evaporated to dryness. The catalyst is reduced in a stream of hydrogen at 250 °; passes a mixture of carbon dioxide and hydrogen from 10-20 vol. % carbon dioxide at 350 ° C and 100 atm of pressure over this catalyst, while cooling the gas flow leaving the contact room, a favorable yield of aqueous liquid containing alcohols, aldehydes, ketones and fatty acids is obtained.

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The subject of the patent.

A method for the qualitative reduction of carbon dioxide at elevated temperature and normal or elevated pressure, characterized in that copper, silver, gold or nickel are used as catalysts separately or together with vanadium, chromium, manganese or other closely related elements; 5, 6 and 7 groups or boron, or a mixture of them or their compounds.