Graphene composite ammonia-hydrogen conversion catalyst and preparation method thereof

Abstract

The invention belongs to the technical field of ammonia-hydrogen conversion, and particularly relates to a graphene composite material ammonia-hydrogen conversion catalyst and a preparation method thereof. The graphene composite material ammonia-hydrogen conversion catalyst comprises a graphene-containing composite oxygen hydride, and a metal-based graphene composite oxygen hydride with catalytic activity is obtained by introducing a metal compound solution with ammonia synthesis activity. The graphene composite material ammonia-hydrogen conversion catalyst prepared by the invention has higher decomposition activity than a metal oxide, and aims at reducing the use amount of Ru, Fe, Co and Ni catalysts and other metal loading, so that the cost of the ammonia synthesis catalyst is reduced, the ammonia-hydrogen conversion catalyst with low metal loading capacity is designed and realized, the economic benefit is reduced, industrial production. and the catalytic activity of ammonia-hydrogen conversion is improved.

Description

technical field [0001] The invention belongs to the technical field of ammonia-hydrogen conversion, and in particular relates to a graphene composite ammonia-hydrogen conversion catalyst and a preparation method. Background technique [0002] As a highly reactive fuel, hydrogen is considered to be one of the most important green and clean energy sources in the future. The hydrogen combustion rate is fast, the heat release rate is high, the combustion product is only water, and there is no carbon dioxide emission. The development of new combustion technology and equipment using hydrogen as fuel has become a breakthrough to alleviate the global greenhouse effect and energy shortage. [0003] Catalytic ammonia decomposition is a very promising solution for zero-carbon hydrogen production. At present, ammonia-hydrogen conversion catalysts mainly include noble metal catalysts, transition metal oxides, and nitride catalysts. The noble metal ruthenium (Ru) has the highest cataly...

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Problems solved by technology

[0004] In view of this, the present invention proposes a graphene composite ammonia-hydrogen conversion catalyst and a preparation method and a method for preparing hydrogen, aiming at traditional Ru (2%-5%, Ru-TiO 2 , Ru-ZrO 2 and Ru-Al 2 o 3, The decomposition rate of ammonia is 10gNH 3 g -1 h -1 ), Fe (2-3% Fe remains in commercial carbon nanotubes, 2.8g NH can be obtained at 700°C 3 g -1 h -1 ), Co (2%-5%), Ni (its particle size is directly related to the ammonia-hydrogen conversion activity, and when Ni particles are loaded on carbon nanotubes, they also show better catalytic activity for ammonia-hydrogen conversion than activated carbon supports, but Due to the lack of effective structural stabilizers, it is very easy to deactivate in the ammonia-hydrogen conversion state) the amount of catalyst is too large, reduce the amount of Ru, Fe, Co, Ni catalysts and other metal loading, improve catalyst stability, reduce noble metal content, Design and Realization of Graphene Composite Ammonia-Hydrogen Conversion Catalyst with Low Metal Loading

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