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Preparation method for photocatalytic heterojunction catalyst for reversible hydrogen storage, product and application of catalyst

A catalyst and heterojunction technology, applied in the field of preparation of photocatalytic heterojunction materials, can solve the problems of weak binding effect of metal nanoparticles, difficult to control the distribution of metal nanoparticles, poor catalyst stability, etc., so as to improve the photocatalytic activity, Efficient hydrogen release performance, accelerated migration effect

Inactive Publication Date: 2020-01-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the TiO 2 The disadvantage of semiconductor materials applied to Mott-Schottky catalysis is TiO 2 The Fermi level of TiO is very low, in other words, TiO 2 The material is too stable to donate electrons; another reason is that TiO 2 The surface functional groups of semiconductor materials are less, and the binding effect with metal nanoparticles is weak, so it is difficult to control the distribution of metal nanoparticles on its surface, and the stability of the catalyst after compounding is also poor.

Method used

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  • Preparation method for photocatalytic heterojunction catalyst for reversible hydrogen storage, product and application of catalyst
  • Preparation method for photocatalytic heterojunction catalyst for reversible hydrogen storage, product and application of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A photocatalytic heterojunction catalyst for reversible hydrogen storage, incorporating TiO 2 Mott-Schottky catalyst composed of nanoparticles of noble metals deposited on the surface as a substrate, TiO 2 The semiconductor plays the role of electron supply, and the surface of the noble metal end is enriched with a large number of electrons, which shows high activity under the condition of light excitation, and the noble metal / TiO 2 The synthesis of the heterojunction Mott-Schottky catalyst is as follows:

[0034] Weigh 0.2 g of TiO 2 Powder (P25), put into 50 mL concentration of 5 wt% H 2 PtCl 6 In the aqueous solution, stir evenly; then add a small amount of NaOH dropwise to adjust the pH value of the aqueous solution to about 12; then slowly add NaBH dropwise under stirring 4 solution to precipitate noble metal Pt particles on TiO 2 Powder surface; then filter, wash the obtained powder with deionized water, dry at 110°C, and grind to obtain Pt / TiO 2 Heterojunct...

Embodiment 2

[0039] A photocatalytic heterojunction catalyst for reversible hydrogen storage, the preparation steps are the same as in Example 1, and the product is the same.

[0040] Pt / TiO 2 Evaluation of the Hydrogen Storage Performance of Heterojunction Catalysts:

[0041] Weigh 0.2 g of Pt / TiO 2 The catalyst was placed in a quartz reactor, and the quartz reactor was heated to 250 °C at the same time, and then the reaction system was evacuated to below 1 Pa to remove water molecules and impurities adsorbed on the surface of the catalyst; then the reactor was cooled to room temperature, and the valve was opened to 600 μmol of hydrogen and 200 μmol of benzene were injected into the vacuum reactor, and the catalytic products were detected and quantitatively analyzed without using a light source. After testing, it was found that after 24 hours of reaction, benzene can directly undergo hydrogenation reaction with hydrogen, and the benzene reaction is complete, and its conversion rate reac...

Embodiment 3

[0043] A photocatalytic heterojunction catalyst for reversible hydrogen storage, similar to Example 1, except that the noble metal precursor is different, according to the following steps:

[0044] Weigh 0.2 g of TiO 2 Powder (P25), put into 50 mL concentration of 5 wt% H 2 AuCl 6 In the aqueous solution, stir evenly; then add a small amount of NaOH dropwise to adjust the pH value of the aqueous solution to about 12; then slowly add NaBH dropwise under stirring 4 solution to precipitate noble metal Au particles on TiO 2 The surface of the powder; then filtered, the obtained powder was washed with deionized water, dried at 110 °C, and ground to obtain Au / TiO 2 Heterojunction Mott-Schottky catalyst material, referred to as: Au / TiO 2 heterojunction catalysts.

[0045] Evaluation of the hydrogen release performance:

[0046] Weigh 0.2 g of Au / TiO 2 The heterojunction catalyst is placed in a quartz reactor, and the quartz reactor is heated to 250 °C at the same time, and the...

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Abstract

The invention relates to a preparation method for a photocatalytic heterojunction catalyst for reversible hydrogen storage, the product and an application of the catalyst. The method uses TiO2 as a substrate to deposit precious metal nanoparticles on the surface of the substrate to form the Mott Schottky catalyst, the TiO2 semiconductor has an electron supply function, and a large number of electrons are enriched at the surface of the precious metal end and show high activity under the condition of light excitation. Compared with a current cyclohexane conversion photocatalyst, the catalyst provided by the invention has a series of advantages such as a higher cyclohexane conversion rate (90% or more), and higher hydrogen release and storage capacity (300 [mu]mol).

Description

technical field [0001] The present invention relates to a method for preparing a reversible hydrogen storage photocatalytic heterojunction material and its products and applications, specifically a method for preparing a noble metal modified titanium dioxide material and its application in the reversible storage and dehydrogenation of cyclohexane Applications. Background technique [0002] Energy is an important material basis for our human survival and development. The development and utilization of energy is as big as the development of a country or even the whole world, and as small as it is closely related to the basic necessities of each of us. Hydrogen has the advantages of high combustion calorific value, wide sources, non-polluting reaction products, multiple utilization forms, and energy storage. It is an ideal and extremely important clean energy carrier in the future. According to the "China Hydrogen Energy and Fuel Cell Industry Development Research Report" rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/52B01J35/02C01B3/50B01J35/00
CPCB01J23/42B01J23/52C01B3/508B01J35/40B01J35/39
Inventor 王敬锋张文雨徐少洪郭继鹏金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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