Catalyst and preparation method and use thereof

Abstract

The invention relates to a catalyst and a preparation method and use thereof. The catalyst contains transition metal elements, a complex formed by a compound containing a group shown in a formula (I)and a carrier, the complex is dispersed on the carrier, the efficiency of hydrogen produced by water through catalytic photodissociation is up to 6.92 mmol / g / h, compared with a catalyst prepared by atraditional hydrothermal method, the activity of the catalyst is obviously improved, the preparation process of the catalyst is simple, the preparation process conditions are mild, and the hydrothermal and high-temperature calcination reaction conditions are not required.

Description

technical field [0001] The invention relates to the field of preparation of catalytic materials, in particular to a catalyst and its preparation method and application. Background technique [0002] At present, the rapid consumption of fossil and coal energy and environmental pollution caused by the rapid development of the world economy are becoming more and more serious. The search for new environmentally friendly, low-cost and abundant renewable energy has become one of the hot research fields in the 21st century. Among them, hydrogen, as a new secondary energy source, has the advantages of abundant sources, green and non-toxic, and high combustion calorific value (ΔH=-285.8kJ / mol, more than three times that of petroleum). However, the reserves of hydrogen in nature are small and mainly rely on artificial production. due to H 2 The thermal decomposition of O is thermodynamically a non-spontaneous process (ΔG = +237kJ / mol), and it is possible to use semiconductor catalys...

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Problems solved by technology

However, the reserves of precious metal elements on the earth are scarce, and the cost of raw materials is high, which is subject to many restrictions in the process of industrial application

[0004] CN108671955A discloses a composite catalyst for hydrogen production by photolysis of water and its preparation method. During the preparation of the catalyst, the cobalt source is mixed with dicyandiamide, and then calcined at a high temperature (400-600° C.) to obtain Co- g-C 3 N 4 , compare it with MoS 2 Nanosheets are mixed and calcined to obtain the catalyst. The preparation process of the catalyst described in this scheme requires multiple calcinations, which requires high energy consumption, and the efficiency of catalytic photolysis of water to produce hydrogen is insufficient.

[0005] CN109174127A discloses a composite photocatalyst for photolyzing water to prepare hydrogen for fuel cells and a preparation method thereof. The method comprises dispersing graphene oxide in water, adding copper acetate and zinc sulfate, stirring, and then adding thioacetamide, Stir, transfer the mixed solution to a hydrothermal reactor for hydrothermal treatment, and then load Pt to obtain the catalyst; the preparation method of this scheme is complicated, and the noble metal Pt needs to be added, which significantly increases the cost of the catalyst

[0006] Although the above-mentioned documents disclose some methods for preparing photocatalysts for photolysis of water, the methods all adopt hydrothermal treatment and / or high-temperature calcination to obtain the catalysts. The preparation costs of the catalysts are relatively high, and the obtained catalysts decompose water to produce hydrogen Therefore, it is still of great significance to develop a catalyst with a simple preparation process and high hydrogen production efficiency in water splitting under light.

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