Carbon@alumina supported ruthenium-based ammonia synthesis catalyst and preparation method thereof

An alumina-supported, ruthenium catalyst technology is applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., and can solve problems such as poor ammonia synthesis performance of ruthenium catalysts, Achieve the effect of improving adsorption/desorption properties, good application prospects, ammonia synthesis activity and heat resistance.

Inactive Publication Date: 2019-07-23
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the strong acidity of the alumina carrier itself and the strong interaction between alumina and ruthenium metal are not conducive to the adsorption, dissociation and desorption of reaction gases including nitrogen, hydrogen and ammonia, so the ruthenium prepared by using it as a carrier Catalyst with poor ammonia synthesis performance

Method used

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  • Carbon@alumina supported ruthenium-based ammonia synthesis catalyst and preparation method thereof
  • Carbon@alumina supported ruthenium-based ammonia synthesis catalyst and preparation method thereof
  • Carbon@alumina supported ruthenium-based ammonia synthesis catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Equal volume impregnation of aluminum oxide in ruthenium chloride aqueous solution to Ru:Al 2 o 3 The mass ratio is 0.10:1, dried at 120 °C for 4 hours; reduced in a hydrogen atmosphere at 500 °C for 6 hours, and cooled to room temperature in the above atmosphere. The obtained sample was impregnated with barium nitrate aqueous solution until the molar ratio of Ba to Ru was 0.6:1, dried at 120°C for 4 hours; reacted at 900°C in 50mL / min methane gas for 0.1 hour to obtain carbon@alumina-supported ruthenium Base ammonia synthesis catalyst, wherein the content of carbon is 7wt%.

Embodiment 2

[0024] Equal volume of alumina impregnated with ruthenium nitrosyl nitrate solution to Ru:Al 2 o 3 The mass ratio was 0.15:1, dried at 120°C for 4 hours; reduced in a hydrogen atmosphere at 500°C for 6 hours, and cooled to room temperature in the above atmosphere. The obtained sample was impregnated with barium oxalate aqueous solution until the molar ratio of Ba to Ru was 0.9:1, dried at 120°C for 4 hours; reacted in 150mL / min of acetylene gas at 800°C for 1 hour to obtain carbon@alumina supported ruthenium Base ammonia synthesis catalyst, wherein the content of carbon is 6wt%.

Embodiment 3

[0026] Equal volume of alumina impregnated with ruthenium nitrosyl nitrate solution to Ru:Al 2 o 3 The mass ratio was 0.12:1, dried at 120°C for 4 hours; reduced in a hydrogen atmosphere at 500°C for 6 hours, and cooled to room temperature in the above atmosphere. The obtained sample was impregnated with barium acetate aqueous solution until the molar ratio of Ba to Ru was 5:1, and dried at 120 °C for 4 hours; After reacting at 700°C for 0.5 hours, a charcoal@alumina-supported ruthenium-based ammonia synthesis catalyst was obtained, wherein the charcoal content was 3wt%.

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Abstract

The invention discloses a carbon@alumina supported ruthenium-based ammonia synthesis catalyst and a preparation method thereof, and relates to a catalyst preparation method for introducing a carbon layer on an alumina supported ruthenium catalyst by using alumina as a carrier and ruthenium metal as an active component. The preparation method includes the following concrete steps: firstly, introducing the ruthenium metal into the alumina, then impregnating a barium precursor aqueous solution to obtain the alumina supported ruthenium catalyst, and then carrying out a reaction at a certain temperature in carbon-containing gas for a certain period of time to obtain the carbon@alumina supported ruthenium-based ammonia synthesis catalyst. Compared with a carbon-alumina composite material supported ruthenium metal catalyst prepared by a conventional method, the catalyst of the invention has higher ammonia synthesis activity, good heat resistance and better application prospect.

Description

technical field [0001] The invention belongs to the technical field of ammonia synthesis catalysts, in particular to a method for preparing a carbon@alumina-supported ruthenium-based ammonia synthesis catalyst. Background technique [0002] Ammonia is not only the main raw material of chemical fertilizers, but also one of the important raw materials in industrial fields, such as plastics, medicine, explosives, metallurgy, environmental protection and many other fields. It is one of the most important chemical products and consumables in the world. Activated carbon-supported ruthenium catalysts have been applied industrially. Because of their excellent performance, ruthenium catalysts are also known as the second-generation ammonia synthesis catalysts after iron catalysts. However, the severe ammonia synthesis reaction conditions of high temperature and pressure are not conducive to the long-term operation of activated carbon-supported ruthenium catalysts. Therefore, people h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01J37/18B01J37/02B01J37/08C01C1/04
CPCB01J23/58B01J37/0201B01J37/084B01J37/18C01C1/0411Y02P20/52
Inventor 林炳裕方笔耘衡岚倪军林建新江莉龙
Owner FUZHOU UNIV
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