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Process for synthesizing mesoporous TiO2 using phosphotungstic acid as template agent

A technology of phosphotungstic acid and template agent, which is applied in chemical instruments and methods, molecular sieve properties aluminum phosphate, molecular sieve and alkali exchange compounds, etc., can solve the problems of insufficient stability of materials, need to improve load uniformity, and easy detachment of solid acid. To achieve the effect of orderly structure, low cost and uniform pore size

Inactive Publication Date: 2007-04-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relevant researchers used the impregnation method to load phosphotungstic acid on TiO 2 Molecular sieve surface improves the catalytic activity, but the material is not stable enough, the solid acid is easy to fall off, and the loading uniformity needs to be improved
The above modification method is based on TiO 2 A single operational step after synthesis that takes a certain amount of time

Method used

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  • Process for synthesizing mesoporous TiO2 using phosphotungstic acid as template agent
  • Process for synthesizing mesoporous TiO2 using phosphotungstic acid as template agent
  • Process for synthesizing mesoporous TiO2 using phosphotungstic acid as template agent

Examples

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Effect test

Embodiment 1

[0021] Mix 3.6g of tetrabutyl titanate and absolute ethanol evenly at a mass ratio of 1:7, then add 0.48ml of phosphotungstic acid water solution with stirring, the concentration is 0.01M, after stirring for 3 hours, add 5ml of deionized water dropwise, and continue stirring for 2 hours ; After taking it out, it was rotated and evaporated, washed with deionized water and absolute ethanol several times, after drying, it was roasted at 500°C for 3h to obtain the mesoporous TiO 2 .

Embodiment 2

[0023] Mix 3.6g of tetrabutyl titanate and absolute ethanol evenly at a mass ratio of 1:7, add 0.48ml of phosphotungstic acid water solution with stirring, the concentration is 0.05M, stir for 3 hours, add 5ml of deionized water dropwise, and continue stirring for 2 hours ; After taking it out, it was rotated and evaporated, washed with deionized water and absolute ethanol several times, after drying, it was roasted at 500°C for 3h to obtain the mesoporous TiO 2 .

Embodiment 3

[0025] Mix 3.6g of tetrabutyl titanate and absolute ethanol evenly at a mass ratio of 1:7, then add 0.48ml of phosphotungstic acid water solution with stirring, the concentration is 0.1M, after stirring for 3 hours, add 5ml of deionized water dropwise, and continue stirring for 2 hours ; After taking it out, it was rotated and evaporated, washed with deionized water and absolute ethanol several times, after drying, it was roasted at 500°C for 3h to obtain the mesoporous TiO 2 .

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Abstract

The process of synthesizing mesoporous TiO2 with phosphotungstic acid as template agent relates to process of synthesizing mesoporous molecular sieve and realizing material doping modification with solid acid template agent and belongs to the field of inorganic porous material synthesizing technology. The mesoporous TiO2 is synthesized through dissolving tetrabutyl titanate in anhydrous alcohol and adding water solution of phosphotungstic acid via stirring; taking the mixture, rotation evaporating and washing; vacuum drying and roasting at 500deg.C for 3 hr. The present invention utilizes the Keggin structure of phosphotungstic acid to form hydrogen bond between the water molecule and phosphotungstic acid molecule and to serve as template agent so as to synthesize the mesoporous material and modify TiO2 simultaneously. The mesoporous TiO2 has great specific surface area, homogeneous pore size, ordered structure and excellent stability.

Description

technical field [0001] The invention relates to a method for synthesizing mesoporous TiO with phosphotungstic acid as a template 2 The method, especially relates to a method for synthesizing mesoporous molecular sieves with solid acid templates and synchronously realizing material doping modification, belonging to the technical field of synthesis methods of inorganic porous materials technical background [0002] Since 1995, the improved sol-gel method was used to synthesize mesoporous TiO 2 Since, mesoporous TiO 2 Due to its large specific surface area and pore volume, adjustable pore size, and modifiable surface properties, it has attracted extensive attention from researchers in the fields of heterogeneous catalysis, adsorption separation, and advanced inorganic materials. [0003] In the synthesis of mesoporous TiO 2 In the process of molecular sieves, organic templates such as amines, polymers, cationic or anionic surfactants are often used as porogens. At the end of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/00C01B37/06C01G23/047
Inventor 骆广生黄丹王玉军
Owner TSINGHUA UNIV
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