Tantalum titanate cadmium sulphide platinum-carried laminated composite catalyst and its preparation method

Abstract

The invention discloses a layered stromal HTiTaO5 / CdS Pt-carrying new-typed composite catalyst and making method, which comprises the following steps: mixing K2CO3, Ta2O5 and TiO2 at chemical gauge rate; sintering to obtain the KTiTaO5 product; proceeding KTiTaO5 to obtain catalyst layered stromal HTiTaO5 through nitric ion exchange; exchanging the stromal HTiTaO5 with saturated cadmium acetate ion through pile-supported propanamine; vulcanizing the exchanged stromal HTiTaO5 in the pipe-typed furnace hydrogen sulfide atmosphere at high temperature to produce HTiTaO5 / CdS; carrying Pt through photoreduction. The invention reaches the highest hydrogen-producing rate at 144umol / h and 6.3 percent quantum efficiency at 420 nm and 1.67 percent optical conversion efficiency for all-band of visible light, which improves the product activity.

Description

technical field [0001] The present invention relates to the field of hydrogen energy preparation, and relates to the photocatalytic clean preparation technology of hydrogen energy, that is, the photocatalytic decomposition hydrogen production technology using water as raw material under the condition of simulating the visible light of the sun, and in particular to a composite tantalum titanate cadmium sulfide HTiTaO 5 / CdS supported platinum catalyst and preparation method thereof. Background technique [0002] Insufficient supply of conventional primary energy, shortage of liquid fuels, serious pollution caused by the use of fossil energy, CO 2 The pressure of emission reduction and the problem of energy consumption in rural and remote areas have made my country face multiple pressures, prompting people to look for new clean alternative energy sources. Vigorously strengthening the basic theoretical research on the conversion and utilization of renewable energy, and develop...

AI Technical Summary

Problems solved by technology

Although the preparation of hexagonal cadmium sulfide by liquid phase method at low temperature has been realized, the crystallinity is generally poor (see Chinese patents CN1504825, CN1556028)

[0013] From the elaboration of the above prior art, it can be seen that, on the one hand, the cadmium sulfide prepared by the traditional method mostly exists in a cubic phase with lower activity without high temperature treatment, with poor crystallinity and a large amount of impurities may exist; Although the crystallinity has been improved, it either requires cumbersome follow-up treatment to remove a large number of by-products produced by heat treatment, or the anti-oxidation ability in the air is deteriorated, which in turn leads to the intensification of photocorrosion in the process of photocatalytic hydrogen production

On the other hand, after years of research and exploration, although a large number of new visible light-responsive photocatalysts have been reported internationally, their activity is generally low.

Although the cadmium sulfide prepared by the traditional method has high activity, it is easily corroded by light, which limits its application in the field of photocatalytic hydrogen production.

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