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Preparation method of supported ruthenium-based catalyst

A ruthenium-based catalyst, supported technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of good stability, simple preparation process and high catalytic activity

Pending Publication Date: 2021-02-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at lower temperature (350-500°C) and higher reaction space velocity (30000mL·g cat -1 h -1 The research and development of new ammonia decomposition catalysts with high activity and high stability under the conditions of above) still faces great challenges

Method used

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  • Preparation method of supported ruthenium-based catalyst
  • Preparation method of supported ruthenium-based catalyst
  • Preparation method of supported ruthenium-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Weigh 0.08g of ruthenium chloride and dissolve it in 100mL of water, add 3.7g of magnesium oxalate to the aqueous solution of ruthenium chloride under stirring, and then add 3.6g of urea to the above suspension, then react at 80°C under stirring 8 hours. After the reaction is completed, filter and wash the product repeatedly with deionized water until the filtrate is neutral. After the product was dried, it was reduced with hydrogen at 500°C for 2 hours to obtain a magnesium oxide-supported ruthenium catalyst (3wt.%Ru / MgO) with a ruthenium loading of 3wt.%, marked as 1#.

[0093] The ammonia decomposition reaction activity of the prepared catalyst was evaluated in an ammonia decomposition device. In pure ammonia, the space velocity is 30000mL·g cat -1 h -1 1. Under the condition that the reaction pressure is normal pressure and the reaction temperature is 450° C., the conversion rate of ammonia is 92.3%. In pure ammonia, the space velocity is 20000mL·g cat -1 h ...

Embodiment 2

[0095] Weigh 0.03g of ruthenium chloride and dissolve it in 80mL of water, add 3.7g of magnesium oxalate to the aqueous solution of ruthenium chloride under stirring, stir well, then add 2.0g of urea to the above suspension, and then react at 70°C under stirring 8 hours. After the reaction is completed, filter and wash the product repeatedly with deionized water until the filtrate is neutral. After the product was dried, it was reduced with hydrogen at 500° C. for 2 hours to obtain a magnesium oxide-supported ruthenium catalyst (1 wt.% Ru / MgO) with a ruthenium loading of 1 wt.%, which was marked as 2#.

[0096] The ammonia decomposition reaction activity of the prepared catalyst was evaluated in an ammonia decomposition device. In pure ammonia, the space velocity is 10000mL·g cat -1 h -1 1. Under the condition that the reaction pressure is normal pressure and the reaction temperature is 450° C., the conversion rate of ammonia is 98.5%.

Embodiment 3

[0098] Weigh 0.08g of ruthenium chloride and dissolve it in 150mL of water, add 3.7g of magnesium oxalate into the aqueous solution of ruthenium chloride under stirring, and then add 1.0g of sodium carbonate to the above suspension, and then stir at 150°C React for 2 hours. After the reaction is completed, filter and wash the product repeatedly with deionized water until the filtrate is neutral. After the product was dried, it was reduced with hydrogen at 50° C. for 12 hours to obtain a magnesium oxide-supported ruthenium catalyst with a ruthenium loading of 3 wt.%, marked as 3#.

[0099] The ammonia decomposition reaction activity of the prepared catalyst was evaluated in an ammonia decomposition device. In pure ammonia, the space velocity is 10000mL·g cat -1 h -1 1. Under the condition that the reaction pressure is normal pressure and the reaction temperature is 450° C., the conversion rate of ammonia is 93.4%.

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Abstract

The invention discloses a preparation method of a supported ruthenium-based catalyst, and belongs to the field of catalyst preparation. The method comprises the following steps of: taking magnesium oxalate as a carrier precursor, and preparing the supported ruthenium-based catalyst by adopting a precipitation deposition method. The supported ruthenium-based catalyst comprises a carrier and an active component, wherein the carrier comprises magnesium oxide, and the active component comprises Ru. The catalyst can be used as an ammonia decomposition hydrogen production catalyst. The supported ruthenium-based catalyst obtained according to the method has a low content of precious metal ruthenium, and has high catalytic activity and catalytic stability at a relatively low temperature. In addition, the method is simple in preparation process, low in cost and easy to realize large-scale production.

Description

technical field [0001] The application relates to a preparation method of a supported ruthenium-based catalyst, which belongs to the field of catalyst preparation. Background technique [0002] The development of reliable and practical on-site hydrogen production technology is one of the key issues to be solved in the development of hydrogen energy. As a hydrogen storage medium, ammonia has the advantages of high hydrogen storage density, easy liquefaction, mature production, storage and transportation technology, and simple hydrogen production process. It is considered to be a "hydrogen carrier" with broad application prospects. In recent years, the technology of catalytic ammonia decomposition for hydrogen production has attracted the attention of academia and industry. Compared with the gaseous hydrogen storage technology, the easy-to-transport liquid ammonia is used as the liquid fuel, and the on-site hydrogen production is carried out through the ammonia decomposition ...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/58B01J37/03C01B3/04
CPCB01J23/58B01J37/031C01B3/047C01B2203/0277C01B2203/1064Y02E60/36
Inventor 柳林鞠晓花陈萍冯吉张西伦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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