SU117961A1 - Method of making promoted ammonia synthesis iron catalyst - Google Patents

Description

A known method for the manufacture of a promoted iron catalyst for the synthesis of ammonia by melting iron or its oxides with the addition of promoters, for example, alumina or weakly acid oxides, and also oxalo-alkali metals and oxides.

The described method as compared with the known one allows to obtain a more active catalyst.

To this end, the promoters are introduced into the melt in a specific sequence, first with weakly acidic or amphoteric oxides of melt oxides, and then, after the alloy is mixed, oxides or compounds of alkaline earth metals and, finally, oxides or compounds of alkali metals are introduced.

In the case of the use of metallic iron, the latter is first fused with compounds of amphoteric or weakly acid oxides, and the resulting alloy is subjected to oxidative smelting in oxygen with the successive addition of oxides or other compounds of alkaline earth and alkali metals.

Since a large number of factors affecting the quality of the catalyst are shown by the telescope of the process and a more complete interaction with the oxides of iron and alloys of photomeric and weakly acid oxides is possible, metals, aluminum, silicon, titanium, etc., from which oxides are formed, add in the process of smelting the catalyst, or, in the case of oxidative smelting, it is preliminarily introduced in the smelting of l: iron in martens, electric furnaces, Bessemer and t-and. This alloy, in the form of rolled products, is used to prepare a catalyst. The best results are obtained by preliminary batch melting of this alloy in high-frequency furnaces, and then the transfusion of the liquid mass of the melt into crucibles for oxidative melting of KO and 7961

lysator with the addition after partial oxidation of the melt only alkali oxides: noselle 5 and alkali metals.

After the end of the smelting process, the mass for rapid solidification is either poured into a water-cooled mold, or, with a small mass, the alloy is left in the crucibles, if the latter are made of steel and have a water jacket.

Pr and measures. 36 kg of iron alloy from 1.5% aluminum are divided into four parts of 9 kg each. In the oxidation of the first portion, SiOg is introduced, in the oxidation of the second portion — AlgOs, in the oxidation of the third portion — CaO, and in the oxidation of the latter portion — KNOj.

When each subsequent batch is oxidized, the whole mass becomes liquid and homogeneous, with the exception of a very thin crust on the walls of water-cooled crucibles in which the catalyst is melted. In 20 minutes. after the end of the melting, the frozen mass is discharged from the crucible in the form of a pig. The crushing of the catalyst pigs is carried out in the usual manner.

The resulting catalyst has a high activity and resistance to women.

Subject invention

Claims (2)

1. A method of manufacturing a promoted iron catalyst for ammonia synthesis by melting iron or its oxides with additives of promoters, for example, amphoteric or weakly acid oxides, as well as alkaline earth and alkali metal oxides, characterized in that into the melt in a certain sequence, first low-acid or amphoteric refractory oxides, and then, after mixing the alloy, oxides or compounds of alkaline earth metals, and finally, oxides or compounds alkali metals. 2. Alteration of the method according to claim 1, which is such that in the case of the use of metallic iron, the latter is first fused with compounds of amphoteric or weakly acid oxides and the resulting alloy is subjected to oxidative smelting in oxygen with successive addition of oxides or other compounds of alkaline earth and alkali metals.