A Cu@mSiO2 core-shell nano-catalyst for hydrogen production by hydrolysis of ammonia borane and hydrazine borane and its preparation method

Abstract

The invention provides a Cu@mSiO2 core-shell nanocatalyst for hydrogen production by hydrolysis of ammonia borane and hydrazine borane and a preparation method thereof. The catalyst is prepared by one-pot inverse micelle method, and the core is composed of non-precious metal copper (Cu) and the core-shell nanostructure of the outer shell is composed of mesoporous silica (mSiO2). The catalyst is analyzed by TEM image, and the inner core is metal Cu nanoparticles, and the outer shell is a core-shell nanostructure of mesoporous SiO2. The catalyst has the characteristics of small core metal particles, mesoporous silica as the outer shell, clear core-shell structure, uniform size, large specific surface area, and excellent catalyst activity and cycle performance.

Description

technical field [0001] The method of the invention relates to a Cu@mSiO used to catalyze the hydrolysis of ammonia borane and hydrazine borane to produce hydrogen 2 The invention discloses a preparation method of a core-shell nanostructure catalyst, which belongs to the field of hydrogen storage materials. Background technique [0002] Hydrogen energy has the characteristics of a wide range of sources, clean and efficient pollution-free, easy production and transportation, and is considered to be one of the most promising energy sources in the future. However, the problem of safe and efficient storage of hydrogen has always been a bottleneck restricting the development and utilization of hydrogen energy. Solid-state hydrogen storage materials have received extensive attention and research. It stores hydrogen in solid-state materials through chemical reactions or physical adsorption. It has high energy density and good safety. It is considered to be the most promising hydroge...

AI Technical Summary

Problems solved by technology

[0002] Hydrogen energy has the characteristics of wide sources, clean, efficient, pollution-free, and easy production and transportation. It is considered to be one of the most promising energy sources in the future. However, the problem of safe and efficient storage of hydrogen has always been a bottleneck restricting the development and utilization of hydrogen energy.

For example, the literature (Journal of Power Sources 163 (2006) 364-370) reported that supported Co, Ni, and Cu have catalytic activity for hydrogen production from ammonia borane hydrolysis, but there is a problem that the metal support is easy to fall off and aggregate on the surface of the carrier, resulting in catalytic Decreased activity and catalyst life

Chinese patent CN102500377A adopts FeCo alloy as a catalyst to catalyze the production of hydrogen from ammonia borane. Its catalytic effect is better and the reaction activation energy is lower. However, the metal nanoparticles synthesized by the inventive method are easy to aggregate because of their magnetic properties, so it is easy to reduce their Catalytic performance leads to poor cycle performance

Chinese patent CN102513125A proposes to synthesize Ag@CoNi nanoparticles with a core-shell structure as a catalyst for hydrogen production by catalyzing the hydrolysis of ammonia borane, and the catalytic effect is good, but the catalyst contains noble metal Ag, and the CoNi metal in the outer shell contains magnetism, which will easily aggregate, resulting in Reduced catalyst activity and shortened lifetime

For example, Chinese patent CN103381486A proposes to prepare a surface-modified core-shell structure Cu@SiO 2 , this method needs to prepare the Cu nucleus first, and then wrap it with SiO 2 , the synthesis method is cumbersome, and the reaction process needs to be realized by heating, and the synthesized core Cu nanoparticles are relatively large, and the outer shell SiO 2 The non-porous structure hinders the contact with the reaction substrate and reduces the activity of the catalyst

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