A kind of amorphous alloy catalyst, its preparation method and its application for hydrogen production by decomposition of hydrazine

Abstract

The invention discloses an amorphous alloy catalyst. The general formula of the catalyst is NixMyPz, wherein the Ni content is 45-80 wt%, the P content is 10-45 wt%; M is a metal additive, and the content is 0-10 wt%. . The invention also discloses a preparation method of the amorphous alloy catalyst and its application in catalyzing the decomposition of hydrazine to produce hydrogen. The local amorphous alloy catalyst of the invention is used for decomposing hydrazine to produce hydrogen, has high catalytic activity, high selectivity, easy recovery and separation, and does not need to add other additives.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to an amorphous alloy catalyst, its preparation method and its application for hydrogen production by decomposing hydrazine. Background technique [0002] Hydrogen, as a clean energy with an energy density of 120kJ / g, has received high attention. As the main way to utilize hydrogen energy, hydrogen fuel cells still face many problems in application, the most important of which are how to produce hydrogen quickly and efficiently and how to store hydrogen efficiently and safely. The method of using high-pressure storage tanks for physical hydrogen storage has low hydrogen storage capacity and is not easy to carry, so it cannot be practically applied. Chemical hydrogen storage is divided into metal solid hydrogen storage and liquid compound hydrogen storage. Among them, solid materials have problems such as slow hydrogen desorption rate, harsh synthesis conditions, and material d...

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Problems solved by technology

However, Rh is expensive and the raw materials are not easy to obtain, so it cannot be applied to large-scale production

Ni, as an active component to improve the selectivity, can be supported on the carrier together with the noble metal Ir to rapidly decompose hydrogen at room temperature, but the selectivity of the supported nickel catalyst without noble metal is only 93% (He, L., et al .(2014).Applied Catalysis B Environmental 147(14):779-788.)

In hydrazine decomposition, even a small amount of NH 3 , will also hinder the further application of

Chinese patent (publication number CN104028284A) has reported the application of skeleton nickel in decomposing hydrazine at room temperature, and the selectivity to hydrogen is greater than 99% under the condition of using alkaline auxiliary agent, but when not adding alkaline auxiliary agent, selectivity up to only 83%

Although alkaline conditions have the effect of improving selectivity for most of the hydrazine catalytic decomposition process, the lye will be consumed by the reaction with carbon dioxide in the air. If the alkali concentration is too high, the sodium carbonate generated will block the reactor. If the reaction Rubber products in the device will also corrode it, and introducing it as an additive will reduce the theoretical hydrogen production efficiency, so it is not suitable for wide use

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