Catalyst for catalyzing ammonia borane to produce hydrogen and preparation method thereof

Abstract

The invention discloses a catalyst for catalyzing ammonia borane to produce hydrogen and a preparation method thereof, the catalyst at least comprises two chemical elements of cobalt and tin, and the molar ratio of Co to Sn of the catalyst is 5: (1-3). The preparation method comprises the following steps: (1) mixing soluble cobalt salt, anhydrous or crystalline tin tetrachloride and deionized water, and magnetically stirring to obtain a mixed solution; (2) adding an alkaline precipitant into the mixed solution, and stirring to obtain a precipitate; and (3) centrifugally washing the precipitate obtained in the step (2), drying overnight, and roasting to obtain the catalyst. The catalyst shows excellent catalytic activity and stability in a reaction of catalyzing ammonia borane to produce hydrogen; according to the present invention, the hydrogen release rate (TOF) of the ammonia borane hydrolysis catalysis at the room temperature is as high as 23 molhydrogenin <-1 > molCo <-1 >, the cycle service life of the catalyst is long, the activity is slightly reduced after the catalyst is cyclically used for 15 times, the problem that the Co-based catalyst is easily inactivated is solved to a great extent, the catalyst is easy to separate, the catalyst can be separated from the reactant by using the strong magnet, and the cost is low; and the catalyst can be recycled and reused, and is easy to popularize and use.

Description

Technical field [0001] The present invention relates to the field of malonic borogenation, and more particularly to a catalyst for catalyzing hydrogen production of amboxygenation and a preparation method thereof. Background technique [0002] With the development of industrialization and the increase in population, people's demand for energy increases, and the reduction in traditional energy reserves and the environmental pollution becomes new challenges. Since the high energy density and environmental friendliness of hydrogen are considered one of the best alternatives to traditional energy. At present, industrialized hydrogen production technology is still mainly hydrogen-hydrogen-hydrogen production, high cost and is harmful to the environment. In recent years, some chemical hydrogen storage materials have been found (NH 3 BH 3 , NABH 4 NH 2 NH 2 ) Can be safely mild water in a suitable catalyst, which has caused more and more interest in people. In chemical hydrogenation, NH...

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Problems solved by technology

Among them, non-noble metals such as copper, cobalt, and nickel are widely distributed and cheap, but due to the nature of the metal itself, the catalytic activity is generally low and easy to agglomerate.

Noble metal catalysts are mainly divided into two categories: palladium-based and ruthenium-based. Although a very small amount can achieve high catalytic performance, for example, the existing literature Liang et al. prepared nano-Ru supported on carbon black by in-situ reduction method. With an average diameter of only 1.7 nm, it exhibits excellent catalytic activity for the hydrolysis of ammonia borane with a conversion frequency (TOF) of 429.5 mol H 2 mol -1 Rumin -1 [Inter.J.HydrogenEnerg.2012,37:17921], but using precious metals to produce hydrogen is expensive and not suitable for large-scale production

In the prior art of using non-noble metals as catalytic ammonia borane to produce hydrogen, Yong Chen et al. 1770-1776.) Synthesized Ni by solid phase reaction 0.7 co 1.3 P nanoparticles and then Ni by solution mixing method 0.7 co 1.3 P combined with graphene oxide to finally get Ni 0.7 co 1.3 P / GO catalyst material, and showed excellent catalytic activity in catalyzing the hydrolysis reaction of ammonia borane, but the synthesis method is complicated and cumbersome, which makes the method difficult to operate

Chinese invention patent [CN202110379332.5] discloses a coral-like three-dimensional supported non-precious metal alloy catalyst, which realizes the fusion between multiple metals by adjusting the carbon thermal shock parameters and metal components, and realizes the controllability of the structure size of metal nanoparticles , although the preparation of the catalyst is simple and the cost is low, the catalytic performance drops significantly after catalysis for 5 times. Therefore, designing and synthesizing a non-precious metal catalyst with convenient preparation, excellent performance, low cost and strong activity is the focus of the present invention. solved problem

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