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Preparation method of copper-silicon catalyst

A catalyst, copper-silicon technology, applied in the field of preparation of copper-silicon catalysts, can solve the problems of low activity and low selectivity, achieve high conversion rate of cyclohexanol, high selectivity of cyclohexanone, reduce energy consumption and material consumption Effect

Inactive Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many studies on low-temperature cyclohexanol dehydrogenation catalysts, CuO / ZnO catalysts are still widely used in domestic industrial plants. However, compared with copper-silicon catalysts, this catalyst has problems such as low activity and low selectivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Co-precipitate 1M sodium carbonate solution and JA-25 silica sol in a stirring precipitation tank. At a temperature of 50°C, the pH value of the end point of the precipitation is 10, and the temperature is aged at 60°C for 30 minutes. After washing , drying, granulation, and tablet molding to obtain a semi-finished carrier. The carrier was roasted at 600°C for 5 hours, and then the carrier was treated in water at 160°C for 1 hour, and then a strong acid was added therein to adjust the acid concentration to 0.5% by weight. %, soaked at 70°C for 2.0 hours, washed, separated, and dried to obtain carrier A. The specific surface area of ​​the carrier is 250.5m 2 / g, the pore volume is 0.32ml / g, and the average pore diameter is 4.2nm.

Embodiment 2

[0024]Co-precipitate 1M sodium carbonate solution and JA-25 silica sol in a stirring precipitation tank. At a temperature of 70°C, the pH value of the end point of the precipitation is 9.0, and the temperature is aged at 70°C for 20 minutes. After washing , drying, granulation, and tablet molding to obtain a semi-finished carrier. The carrier was roasted at 700°C for 4 hours, and then the carrier was treated in water at 180°C for 2 hours, and then a strong acid was added therein to adjust the acid concentration at 1.2% by weight. %, soaked at 80°C for 2 hours, washed, separated, and dried to obtain carrier B. The specific surface area of ​​the carrier is 350.2m 2 / g, the pore volume is 0.45ml / g, and the average pore diameter is 4.9nm.

Embodiment 3

[0026] In a precipitation tank with stirring, co-precipitate 1M nitric acid solution and JN-30 type silica sol. At a temperature of 60°C, the pH value of the precipitation end point is 6.0, and age at a temperature of 90°C for 10 minutes. After washing, Drying, granulation, and tablet molding to obtain a semi-finished carrier, roast the carrier at 800°C for 2 hours, then treat the carrier in water at 200°C for 4 hours, then add strong acid to it, and adjust the acid concentration to 2% by weight , soaked at 80°C for 2 hours, washed, separated, and dried to obtain carrier C. The specific surface area of ​​the carrier is 456.1m 2 / g, the pore volume is 0.85ml / g, and the average pore diameter is 5.2nm.

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Abstract

The invention belongs to the technical field of catalyst production and provides a preparation method and application of a copper-silicon catalyst. The catalyst has the characteristics of high conversion rate of cyclohexanol and high selectivity of cyclohexanone. The catalyst provided by the invention mainly comprises Cu2O / SiO2; in addition, an active additive is added to improve an acid site on the surface of the catalyst, so that side reaction such as cyclohexane is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a copper-silicon catalyst, which can be used in the reaction of preparing cyclohexanone by gas-phase dehydrogenation of cyclohexanol. Background technique [0002] Cyclohexanone is an important organic chemical raw material. It is the main intermediate in the production of caprolactam (the raw material of nylon-6) and adipic acid (the raw material of nylon-66). In addition, cyclohexanone is also widely used in organic solvents , synthetic rubber and industrial coatings and other industrial production processes. The production methods of cyclohexanone mainly include phenol hydrogenation, cyclohexanol dehydrogenation and cyclohexanol oxidation. Because the process of preparing phenol is relatively complicated, and phenol is highly toxic, the method of producing cyclohexanone from phenol is basically no longer used. The preparation of cyclohex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C07C45/29C07C49/303
CPCB01J23/78C07C45/29C07C49/303
Inventor 孙中华张皓殷玉圣袁浩然吴结华
Owner CHINA PETROLEUM & CHEM CORP
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