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Magnesium oxide-supported ruthenium catalyst for hydrogen preparation through ammonia decomposition, preparation method and applications thereof

A technology of ruthenium catalyst and magnesium oxide, which is applied in the field of preparation of highly active magnesia-supported ruthenium catalyst, can solve the problems of different preparation methods and catalyst performance differences, and achieve the effect of simple preparation process, low production cost and uniform dispersion

Inactive Publication Date: 2018-06-15
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

Catalyst preparation methods are different, the performance of the obtained catalyst will be very different

Method used

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  • Magnesium oxide-supported ruthenium catalyst for hydrogen preparation through ammonia decomposition, preparation method and applications thereof
  • Magnesium oxide-supported ruthenium catalyst for hydrogen preparation through ammonia decomposition, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take by weighing 0.0513 gram of ruthenium chloride and be dissolved in 60ml water, under stirring, 0.5 gram of commercial magnesia (specific surface is 20m 2 / g) was added to the aqueous ruthenium chloride solution, stirred evenly, and then 3.0 g of urea was added to the suspension, and then refluxed at 80° C. for 8 hours and room temperature for 12 hours under stirring. After the reaction is completed, filter and wash the product repeatedly with deionized water until the filtrate is neutral. The product was dried at 80°C for 6 hours, and then reduced with ammonia gas at 500°C for 2 hours to obtain a 5 wt.% Ru / MgO catalyst.

Embodiment 2

[0029] Take by weighing 0.0308 gram of ruthenium chloride and be dissolved in 60ml water, under stirring, 0.5 gram of commercial magnesia (specific surface is 50m 2 / g) was added to an aqueous ruthenium chloride solution, stirred evenly, and then 1.0 g of urea was added to the suspension, and then refluxed at 120° C. for 2 hours and room temperature for 12 hours under stirring. After the reaction is completed, filter and wash the product repeatedly with deionized water until the filtrate is neutral. The product was dried at 60°C for 24 hours to prepare a granular catalyst. The above solid particles were filled into a reactor, and then reduced with ammonia gas at 500°C for 4 hours to obtain a reduced 3wt.%Ru / MgO catalyst. In the reduced magnesium oxide-supported ruthenium catalyst, potassium hydroxide is used as an auxiliary agent to modify the magnesium oxide-supported ruthenium catalyst. With respect to the amount of ruthenium, the molar ratio of the added amount of potassi...

Embodiment 3

[0031] Take by weighing 0.0205 gram of ruthenium chloride and be dissolved in 60ml water, under stirring, 0.5 gram of commercial magnesia (specific surface is 100m 2 / g) was added to the ruthenium chloride aqueous solution, stirred evenly, and then 0.2 g of urea was added to the suspension, and then refluxed at 90°C for 12 hours and room temperature for 12 hours under stirring. After the reaction is completed, filter and wash the product repeatedly with deionized water until the filtrate is neutral. The product was dried at 130°C for 24 hours to prepare a granular catalyst. The above solid particles were filled into a reactor, and then reduced with ammonia gas at 200° C. for 12 hours to obtain a reduced 2wt.% Ru / MgO catalyst. In the reduced magnesium oxide-supported ruthenium catalyst, potassium carbonate is used as an auxiliary agent to modify the magnesium oxide-supported ruthenium catalyst. Relative to the amount of ruthenium, the molar ratio of the amount of potassium ca...

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Abstract

The invention provides a preparation method and applications of a magnesium oxide-supported ruthenium catalyst for hydrogen preparation through ammonia decomposition. The catalyst adopts magnesium oxide as a carrier, adopts a metal ruthenium as an active component, wherein the ruthenium particles are uniformly dispersed on the surface of the magnesium oxide, and the ruthenium content accounts for0.5-10% of the total weight of the catalyst. According to the present invention, the magnesium oxide-supported ruthenium catalyst precursor is prepared by using the precipitation deposition method, the obtained product is washed and dried, and the dried product is reduced in the reducing atmosphere so as to prepare the magnesium oxide-supported ruthenium catalyst with highly-dispersed ruthenium; the preparation method is simple, and uses the low-cost magnesium oxide as the carrier; and the prepared magnesium oxide-supported ruthenium catalyst has advantages of good metal dispersibility, high catalytic activity, good stability and the like, and can be used for catalyzing the hydrogen preparation process using ammonia decomposition.

Description

technical field [0001] The invention specifically relates to the preparation and application of a high-activity magnesia-supported ruthenium catalyst for ammonia decomposition to produce hydrogen. Background technique [0002] With the increasingly serious environmental pollution and greenhouse effect, the sustainable development of energy and environment has become a major international political issue of great concern to all countries. Hydrogen energy is a very clean secondary energy source, which has incomparable advantages over traditional energy sources. Hydrogen fuel cells and electric vehicles are being tested all over the world and gradually moving towards industrialization. The large-scale utilization of hydrogen energy involves three related links of hydrogen production, storage and transportation, and application. Among them, efficient and safe hydrogen storage technology is the key technology affecting the promotion and application of hydrogen energy vehicles, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46C01B3/04
CPCB01J23/462C01B3/047C01B2203/0277C01B2203/1064C01B2203/1082Y02E60/36
Inventor 柳林陈萍鞠晓花
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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