SU1264976A1 - Method of preparing nickel cement-containing catalyst for redox process - Google Patents

Abstract

The invention relates to catalytic chemistry, in particular to the preparation of a catalyst for redox processes, and can be used, for example, in methanation (MET) processes, purification of the nitric mixture from oxygen (OKV) and dissociation of ammonia (DA). , To simplify the preparation of the catalyst (CG) with better activity, use a certain ratio of final components when they are mixed. Nickel cement-containing CT is prepared by mixing liquid (W) (water or solution NH,) and solid (T) components (basic nickel carbonate, calcium alknate and graphite), with ratio Ж: Т О, - 0.3: 1. . Further, the mass is molded and calcined at 5 h. The activity of CT and MET at the limiting temperature in comparison with, in the OKV by the residual content in gas C is 0.0003% by volume against 0.003 vol. vol.% at 850 ° C. 1 hp f-ly, 2 tab. Yu O 4; ; Od

Description

The invention of OTHOCHICH to methods for preparing nickel-containing cement-containing catalysts for oxidation-reducing processes.

The purpose of the invention is to simplify the technology and to obtain a catalyst with increased activity due to a certain ratio of the initial components when mixed.

Example 1. 5 kg of basic nickel carbonate are loaded into the mixer.

in terms of nickel oxide in the finished cat, alizator 30 wt.%, 6.7 kg of calcium aluminate and 0.3 kg of graphite. The mass is thoroughly mixed by shivin, after which 2 liters of distilled water are added to the uniform cm s. the mass ratio of the liquid G component to the sum of the solid (T); W: T 0.2: 1 and continue stirring at room temperature for 0.5 hours. The resulting mass is compacted on rollers, then ground, pressed, subjected to hydrothermal treatment for 3 hours and calcined at 350 ° C. cookies 5h. Example 2. The method is carried out analogously to example 1, but with the difference that when mixing the starting components, water is added on the basis of the calculation of G: T 0.1 :. Example 3. The method is carried out analogously to example 1, but with the difference that, when mixing the initial components, water is added from the calculation W: T 0.3.: 1. Example 4. A mixer is loaded with 3.5 kg of basic nickel carbonate in terms of nickel oxide in the finished catalyst 20 wt. 7.7 kg of calcium aluminate and 0.3 kg of graphite. The mass is thoroughly mixed, after which 2 l of an aqueous ammonia solution of 25% concentration W: T 0.2: 1 is added and stirring is continued at room temperature for 0.5 h. The resulting mass is compressed, then grinded, pressed, hydrothermally treated at 80 ° C for 3 hours and calcined for 5 hours.

Example 5. The method is carried out in the same manner as Example: 4, but with the difference that when mixing the components, an aqueous solution of ammonia is added from the calculation of that: 0.1: 1.

Claims (2)

Example 6. The method was carried out analogously to example 4, but with the difference that when the components are mixed, an aqueous solution of ammonia is added on the basis of G: T 0.3: 1. The catalysts are tested in methanation processes, purification of the nitric mixture from oxygen and dissociation of ammonia, and conversion of methane. The results of the tests are given in Tables 1 and 2. Claim 1. A method for preparing a nickel cement-containing catalyst for redox processes, comprising mixing the liquid component with solid and basic nickel carbonate and calcium aluminate, molding and calcining, in order to simplify the technology and obtain a catalyst with increased activity, mixing is carried out at a mass ratio of the liquid component to the sum of solids, equal to 0.1-0.3: 1. 2. The method according to claim 1, of which is also due to the fact that water or aqueous ammonia solution is used as the liquid component. Table 1 T „p is the minimum temperature at which the residual CO content at the output does not exceed about. % Offered by examples T a faces