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A kind of preparation method of carbon material supporting ruthenium metal catalyst containing barium promoter

The technology of a metal catalyst and a ruthenium catalyst is applied in the field of preparation of a ruthenium catalyst, which can solve the problems affecting the stability of the ruthenium catalyst and the ammonia synthesis activity, achieves good industrial application prospects, solves the effects of poor heat resistance and improved activity

Inactive Publication Date: 2017-10-20
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially under high-temperature and high-hydrogen ammonia synthesis conditions, the carbon gasification reactions such as methane and carbon monoxide produced by activated carbon supports are unavoidable, which seriously affects the stability and ammonia synthesis activity of activated carbon-supported ruthenium catalysts.

Method used

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  • A kind of preparation method of carbon material supporting ruthenium metal catalyst containing barium promoter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 5 g of graphitized activated carbon, impregnate an equal volume of 0.05 g / mL ruthenium chloride solution to a mass ratio of Ru:C of 0.10:1, dry at 120 °C for 4 hours; reduce 6 at 500 °C in a hydrogen atmosphere Hours, cooled to room temperature in the above atmosphere; impregnated the obtained sample with barium nitrate aqueous solution to the molar ratio of Ba to Ru of 0.6:1, dried at 120°C for 4 hours; heat treated at 500°C in methane gas for 2 hours, cooled After that, it can be reduced at 430 ℃ for 6 hours in a hydrogen atmosphere.

Embodiment 2

[0020] Take 5 g of graphitized activated carbon, impregnate an equal volume of 0.05 g / mL ruthenium chloride solution to a mass ratio of Ru:C of 0.10:1, dry at 120 °C for 4 hours; reduce 6 at 500 °C in a hydrogen atmosphere hour, cooled to room temperature in the above atmosphere; the obtained sample was immersed in an aqueous solution of barium nitrate to a molar ratio of Ba to Ru of 0.6:1, and dried at 120°C for 4 hours; 1:1) at 500 °C for 2 hours, after cooling, reduce at 450 °C for 6 hours in a hydrogen atmosphere.

Embodiment 3

[0022] Take 5 g of graphitized activated carbon, impregnate an equal volume of 0.05 g / mL ruthenium chloride solution to a mass ratio of Ru:C of 0.08:1, dry at 120 °C for 4 hours; reduce 6 at 500 °C in a hydrogen atmosphere Hours, cooled to room temperature in the above-mentioned atmosphere; The obtained sample was immersed in an aqueous solution of barium nitrate until the molar ratio of Ba to Ru was 0.3:1, and dried at 120°C for 4 hours; 9:1) heat treatment at 400 ℃ for 30 hours, after cooling, reduce in hydrogen atmosphere at 450 ℃ for 16 hours.

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Abstract

The invention discloses a method for preparing a carbon material-loaded ruthenium metal catalyst containing a barium auxiliary agent, which relates to a preparation method of a catalyst with a carbon material as a carrier, ruthenium metal as an active component, and barium as an auxiliary agent. The specific steps are to first impregnate the barium nitrate aqueous solution with a carbon material loaded with ruthenium metal, carry out reduction treatment at a certain temperature, and then process the above-mentioned sample within a certain temperature range under the condition of the presence of carbon-containing gas, and finally in a hydrogen atmosphere or nitrogen atmosphere. A carbon material-supported ruthenium catalyst containing a barium promoter is obtained by reduction with a hydrogen mixture. Compared with the carbon material supported ruthenium metal catalyst containing barium additive prepared by the existing method, the catalyst of the invention has higher ammonia synthesis activity and thermal stability, and has better application prospect.

Description

technical field [0001] The invention relates to a preparation technology of a ruthenium catalyst for ammonia synthesis using nitrogen and hydrogen in the ammonia synthesis industry in the field of chemical fertilizers, in particular to a preparation method of a carbon material-loaded ruthenium metal catalyst containing a barium additive. Background technique [0002] Ruthenium catalyst is known as the second-generation ammonia synthesis catalyst after iron catalyst because of its excellent performance. Among them, the ruthenium catalyst supported by activated carbon has high ammonia synthesis activity and has a good industrial application prospect. The ruthenium catalyst used for ammonia synthesis usually consists of three parts: support, active metal ruthenium, and auxiliary agent. Currently, the more promising ruthenium-based ammonia synthesis catalyst includes three components: graphitized carbon support, ruthenium metal, and barium auxiliary agent. US4600571, US7115239, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/58C01C1/04
CPCY02P20/52
Inventor 林炳裕郭云杰林建新倪军江莉龙
Owner FUZHOU UNIV
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