Preparation method of TiO2 nanometer tube loaded bimetallic catalyst

Abstract

The invention provides a preparation method of a TiO2 nanometer tube loaded bimetallic catalyst. The method uses a hydrothermal method for preparing a TiO2 nanometer tube; then, a soaking method and achemical reduction method are used for loading the transition metal Cu and the other transition metal M (Ni, Co, Fe, Zn and Cd) (double base metal), so that the loaded metal particles can be sufficiently and uniformly adsorbed onto the surface of the TiO2 nanometer tube and can be uniformly dispersed and sufficiently mixed in the subsequent reduction process and final structure; the activity andthe stability of the particles as catalysts can be enhanced. The base metal loaded TiO2 nanometer tube of a core shell structure is also obtained; the metal load of the core shell structure can accelerate the electron transfer between the metal particles and TiO2; the catalysis activity of the particles as the catalysts can be enhanced.

Description

Technical field [0001] The invention belongs to the field of catalysis, and specifically relates to a TiO 2 A preparation method of a nanotube-supported bimetallic catalyst and its application in photocatalytic ammonia borane water liberation of hydrogen. Background technique [0002] One-dimensional TiO 2 Nanomaterials have fewer grain boundaries, large aspect ratios, fast charge transfer, large specific surface area, and significantly enhanced light absorption and scattering performance. These advantages make them useful in photocatalysis and sensing. And photovoltaic fields have great applications. But due to TiO 2 There are two main disadvantages: one is that it has a wide band gap (~3.2eV), and the photogenerated electron holes have a high recombination rate; the other is that it can only absorb the ultraviolet region of sunlight, which can only absorb about 5% The utilization rate of sunlight is low. Therefore, the metal is loaded on TiO 2 The composite material can be ma...

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Problems solved by technology

But since TiO 2 There are two main disadvantages: one is that it has a wider band gap (~3.2eV), and the photogenerated electron holes have a higher recombination rate; the other is that it can only absorb the ultraviolet region of sunlight, which can only absorb about 5%. sunlight, the utilization rate of sunlight is low

[0003] At present about the metal supported one-dimensional TiO 2 In the reports of nanomaterials, most of the metal elements are single metals and noble metals, but there are relatively few reports on double non-noble metal loading, and the preparation process is relatively complicated.

For example, Yousef et al. used electrospinning technology to prepare Co-loaded TiO 2 Nanofibers, the loaded composite material has increased the rate of hydrogen production by photocatalytic hydrolysis of ammonia borane, and the hydrogen production rate is 2745.6mL min -1 g -1 ; However, the equipment used to prepare materials is a high-voltage electrospinning machine, which has high equipment costs and low production efficiency; the supported metal is only a single metal, which is prone to oxidation, which affects its efficiency as a catalyst

Yan et al. successfully synthesized Ta-loaded TiO by anodic oxidation and DC magnetron sputtering. 2 Nanotubes, the synthesis of this method requires a large power consumption, and the preparation process requires high equipment and harsh preparation conditions

Preparation of various metal-doped TiO by Liu et al. 2 Nanowires, the crystal growth period of this method is long, the crucible and molten salt are easy to pollute the synthesized crystal, and the molten salt volatiles will pollute the environment and corrode equipment, which is not conducive to large-scale industrial production

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