The method of producing catalyst based on nickel-copper chromite

 

(57) Abstract:

The method of producing catalyst based on Nickel-copper chromite for the selective hydrogenation of unsaturated alcohols by homogenizing the source of the oxides of Nickel (II), copper (II), chromium (III) with the introduction of a mixture of oxides of mineralizer potassium chloride, briquetting and heat treatment of the mixture of oxides at a temperature of 800-1000oC. the effect of the introduction of the mineralizer is to reduce the temperature and duration of the synthesis catalyst.

The invention relates to a process for the preparation of catalysts based on chromium transition elements and may find application in the chemical industry in the processes of organic synthesis for selective hydrogenation of unsaturated alcohols.

A method of obtaining a catalyst based on Nickel-copper chromite [Technology catalysts / edited by I. P. of Muglinova, L.: Chemistry, 1989. - 272 S. ], by which the source materials are used nitrates of Nickel, copper, chromium. Each salt take in the required amount, dissolve in a certain amount of water and gradually heated to boiling. After water evaporation, the resulting material is calcined at 935oTo SUP>C.

The disadvantage of this method of preparation of catalysts based on Nickel-copper chromite are environmental pollution, degradation products of salts, and the high cost of energy for heating and evaporation of water.

Closest to the claimed is a method of obtaining a catalyst of a mixture of oxides [Talanova E. A. Kirsanov, A. I., Ivanov centuries the Study of the conditions of solid-phase synthesis of solid solutions of Cu1-xNixCr2O4"Izv. SCNC HS. Natures. science, 1992, N 3-4. - S. 44-47], in which the source oxides of Nickel (II), copper (II), chromium (III) is weighed with an accuracy of 0.0005 g, homogenized for one hour with alcohol in the air. Then a mixture of oxides bitteroot under pressure P=15 MPa into pellets with a diameter of 20 mm and calcined at a temperature of 1200-1300oWith over 90 hours

The disadvantage of this method is the high temperature heat treatment and the duration of the synthesis, which entails a high energy costs.

The authors faced the problem of developing a method of producing the catalysts based on chromium transition elements at lower temperatures with less duration, which can significantly reduce energy consumption and thereby odesew the copper chromite by homogenizing the source of the oxides of Nickel (II), copper (II), chromium (III) with the introduction of a mixture of oxides of mineralizer, which is potassium chloride, and heat treatment of the mixture of oxides at a temperature of 800-1000oC.

The effect of the introduction of the mineralizer is to reduce the temperature and duration of the synthesis is achieved through the education of microdisplay chloride, transforming the structure formation process of the diffusion region into kinetic energy.

The method consists in obtaining a Nickel-copper chromite by dispensing source of oxides of Nickel (II), copper (II), chromium (III) and mineralizer potassium chloride in the amount of 0.5-1.5% (wt.) by weight of oxides. Next, the original oxides and mineralizer homogenized in an agate mortar for one hour and bitteroot into tablets with a diameter of 20 mm under a pressure P=15 MPa. The synthesis of the catalyst is carried out for 4-5 hours at a temperature of 800-1000oC. For processes in which undesirable presence of chlorides, the resulting Nickel-copper chromite is ground to a grain size 315 μm and washed from potassium chloride to a negative reaction of the chloride ions.

Example 1. Was weighed with an accuracy of 0.0005 g defined by the formula number of the original copper oxide (II), Nickel (and during the hours in an agate mortar. The resulting mixture was bitterbal into tablets with a diameter of 20 mm under a pressure of 15 MPa was placed in a muffle furnace and subjected to heat treatment at a temperature of 900oWith over 4.5 hours

The end of the process of structure formation of the Nickel-copper chromite were determined using x-ray phase analysis: the synthesis of the catalyst was 100%.

Example 2. Prepared Nickel-copper chromite same way as described in example 1, except that as the mineralizer used the bromide of potassium in the same amount. After heat treatment, x-ray phase analysis showed that the process of structure formation of the chromite is approximately 80% completed.

As seen from the above examples, the process of production of chromite, Nickel and copper in the presence of potassium chloride passes fuller compared to the process with the use of bromide of potassium. In addition, the potassium chloride is more available and cheaper than other halides, in particular the potassium bromide.

The method of producing catalyst based on Nickel-copper chromite by homogenizing the source of the oxides of Nickel (II), copper (II), chromium (III), briquetting and heat treatment of a mixture of oxides, characterized in that the composition of the initial oxide is introduced as a mineralizer

 

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