Ternary transition-metal catalyst for ammonia borane hydrolysis and preparation method thereof

Abstract

The invention discloses a ternary transition-metal catalyst for ammonia borane hydrolysis and a preparation method thereof. The catalyst provided by the invention is a Ag0.04@CoxNi0.96-x(x=0-0.96) catalyst with a core-shell structure. According to the invention, ammonia borane is used as a reducing agent to directly reduce a mixed solution of silver nitrate, cobalt salt and nickel salt at different proportions to obtain the catalyst which is directly used for catalyzing ammonia borane hydrolysis. Due to the core-shell structure, the series of catalysts have high catalytic activity. By the adoption of the series of the catalysts for catalyzing ammonia borane hydrolysis at room temperature, the maximum hydrogen desorption rate can reach 1627.3 mlmin<-1>g<-1> and activation energy of the reaction is 28.54 kJmol<-1>. The core-shell structured ternary transition-metal catalyst has characteristics of small particle size, large specific surface area, many catalytic active sites and the like, is beneficial to catalytic hydrolysis of ammonia borane, has advantages of rich resources, low production cost and the like in comparison with a traditional noble metal catalyst, and is a promising catalyst.

Description

technical field [0001] The invention relates to a ternary transition metal catalyst used for the hydrolysis of ammonia borane and a preparation method thereof, belonging to the field of hydrogen storage materials. Background technique [0002] Energy is a powerful driving force to support the development of human society. However, with the rapid development of the global economy, traditional non-renewable energy sources such as coal and oil are increasingly scarce, and the ecological environment is gradually deteriorating. The worldwide energy crisis is becoming more and more serious. Development brings a lot of pressure. Human beings are increasingly aware of the importance of a green environment, therefore, the development of green new energy is of great significance. At present, the most promising development is hydrogen energy. There is a large amount of hydrogen energy stored in hydrides. How to release this energy is the key to the problem. At present, the hydrolysis...

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Problems solved by technology

[0004] However, in the absence of a catalyst, the hydrolysis rate of ammonia borane is extremely slow, so finding a suitable catalyst to release the hydrogen energy in ammonia borane faster and safer is a current research hotspot

Traditional catalysts are generally based on precious metals, which are difficult to achieve industrial production due to their high price and high production costs

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