Method for fast-preparing of easy-controllable micropore- mesopore structure titanium white or the prior body thereof

Abstract

A rapid preparation method of crystal mixed and conveniently doped micropore-meso pore structure titania and the former body of the micropore-meso pore structure titania with the advantages of easy material acquisition, simple and simple and easy preparation condition and technics control and the pore structure can be adjusted in the range of the micropore and the meso pore. The present invention is characterized in that the alkali metal titanate is selected as material to react in a wet atmosphere with a temperature of 20 to 250 degrees and a humidity of 2 to 100 percent for 0.5 to 72 hours, then washed by water or acid solution and finally roasted by air or heatedly treated by solvent. Compared with the prior work, the present invention has the advantages of short reaction time, low preparation cost, easy structure control and easy scale manufacture, etc. The most probable pore size of the micropore-meso pore structure titania and the the former body of the micropore-meso pore structure titania is 1 to 20nm, the pore volume is 0.05 to 0.40.4cm³/g and the specific surface area is is more than 30m²/g.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic porous catalytic materials. Specifically, it is a method for preparing microporous-mesoporous structure titanium oxide or its precursor with controllable pore structure parameters such as most probable pore diameter, specific surface area and pore volume, simple and easy-to-control synthesis conditions, and short synthesis time. Background technique [0002] Pore ​​structure is one of the important indicators of catalysts. It is generally believed that in order to improve the utilization of active sites in the inner pores, it is necessary to try to speed up the diffusion rate or try to shorten the diffusion path. But in fact, the pore sizes of porous catalysts required for different reactants and reaction conditions are different. On the one hand, increasing the pore size of the catalyst can not only expand the scope of its selective entry of macromolecules and large-volume func...

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Problems solved by technology

[0005] However, this method still has some shortcomings: 1) The pore size of the product cannot be adjusted as required, and can only be kept at about 10nm, and it cannot be extended to the micropore range. At the same time, the small-scale adjustment of the pore size is based on sacrificing crystallinity; 2) An aqueous solution must be used, which leads to a long production cycle. The hydration process alone takes 7 to 10 days, and the amount and composition of the solution (pH, ion concentration, etc.) need to be strictly controlled; 3) The specific surface area of ​​the product is mainly controlled by changing the pre-sintering process. Conditions, resulting in complex process, affected by uncertain factors such as temperature field distribution, so that the product quality can not be stable; 4) The reaction raw materials must contain potassium dititanate, which limits the source of raw materials