Tungsten Oxide Mesoporous Materials

1992 Kresge first reported mesoporous silica materials with regular pore structure of MCM-41 called for the study of the molecular sieve material has opened up a new field. Because of mesoporous materials with large specific surface area , uniform adjustable aperture (2-50nm), rules controllable appearance, high thermal stability and hydrolysis resistance and other properties, so that in the separation, adsorption, catalysis, biological materials, information materials, carbon nanotubes prepared applications in areas such as more and more people's attention.

Preparation and properties of mesoporous silica mesoporous silica material has been widely studied, with different structural features have been very easy to prepare, but its performance is difficult to meet the application requirements of different areas, so a non-silicon-type mesoporous research materials more and more. Because the characteristics of tungsten oxide itself in the field of catalysis applications, electrochromic electrode materials, energy storage and microwave materials, so that the mesoporous tungsten oxide material is expected to play a more effective role in these areas. About Preparation of tungsten oxide mesoporous materials at home and abroad have been a number of related stories. The preparation method can be divided into two categories, one is a long-chain organic compounds as a template, tungsten hexachloride tungsten source, after the ethanol gelation by calcination or solvent extraction to remove the organic template agent to prepare tungsten oxide mesoporous materials, but mesoporous tungsten oxide high-temperature calcination easily collapse, and the use of extraction to remove the organic template, and it is difficult to be repeated extraction divisible, while tungsten oxide difficult fully crystallized, so these methods ultimately difficult to get a better structure of tungsten oxide mesoporous materials; the other is hard template method, which uses mesoporous silica as a template to make mesoporous tungsten oxide after its crystallization temperature HF to remove the template, the template is removed such methods in milder conditions, and the template is removed completely. Most of phosphotungstic acid as tungsten source, thus the introduction of impurities of phosphorus, and the emphasis on the application performance of mesoporous tungsten oxide research, unexplored The preparation conditions for the tungsten silicon acid source mesoporous silica (KIT-6) as a template, the template was prepared to explore with a hard tungsten oxide mesoporous materials and preparation conditions.

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