A kind of preparation method of tungsten oxide with three-dimensional ordered macroporous structure
A tungsten oxide, three-dimensional ordering technology, applied in the field of tungsten oxide preparation, can solve the problems of high price and inability to obtain multi-phase tungsten oxide, so as to reduce the preparation cost, avoid the limitation of filling degree and process operation easy effect
Inactive Publication Date: 2017-06-13
BEIJING JIAOTONG UNIV
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Problems solved by technology
In the current technology, the use of tungsten ethoxide as a precursor is expensive; the final product of all processes is pure phase tungsten trioxide with three-dimensional ordered macroporous structure, and it is impossible to obtain heterogeneous tungsten oxides with other stoichiometric ratios
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Embodiment 1
[0042] The preparation method of the tungsten oxide with three-dimensional ordered macroporous structure provided in this embodiment comprises the following steps:
[0043] S1: Preparation of monodisperse spherical colloidal crystal templates;
[0044] S2: the powdered WO 3 ·nH 2 O was added to the hydrofluoric acid aqueous solution and stirred so that WO 3 ·nH 2 O is thoroughly mixed with aqueous hydrofluoric acid to obtain WO 3 dispersion, the WO 3The dispersion medium of the dispersion liquid is slightly dissolved with WO 3 Hydrofluoric acid aqueous solution; In this step, the powdered WO 3 ·nH 2 O is yellow;
[0045] S3: the WO 3 The dispersion is left standing, so that the undissolved WO 3 The powder sinks gradually, and the WO after sinking 3 There is delamination between the powder and the hydrofluoric acid aqueous solution, and the WO in the lower layer 3 Yellow in color, WO dissolved in the upper layer 3 The hydrofluoric acid aqueous solution is colorless...
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Abstract
The invention discloses a method for preparing tungsten oxide with a three-dimensional ordered macroporous structure. The method includes the following steps that S1, a monodisperse sphere colloidal crystal template is prepared; S2, powder WO3.nH2O is added into a hydrofluoric acid aqueous solution and stirred to obtain WO3 dispersion liquid; S3, the WO3 dispersion liquid stands still; S4, the hydrofluoric acid aqueous solution where WO3 is dissolved on the upper layer is taken out and used for soaking the monodisperse sphere colloidal crystal template, and then suction filtration is carried out; S5, the monodisperse sphere colloidal crystal template filled with the hydrofluoric acid aqueous solution where WO3 is dissolved is dried, the dried monodisperse sphere colloidal crystal template is forged, and tungsten oxide with the three-dimensional ordered macroporous structure is obtained. The preparation method can reduce preparation cost of tungsten oxide with the three-dimensional ordered macroporous structure, multi-phase tungsten oxide containing W18O49 can be obtained, and the problem that the filling degree of colloidal crystal template pores filled with sol-like precursors is limited can be effectively avoided.
Description
technical field [0001] The invention relates to the technical field of material preparation with a three-dimensional ordered macroporous structure. More specifically, it relates to a method for preparing tungsten oxide with a three-dimensional ordered macroporous structure. Background technique [0002] Three-dimensional ordered macropores (Three-dimensional ordered macropores, 3DOM) materials, as a new class of macroporous materials, have high specific surface area. It has the following unique advantages: (1) Large pore size is conducive to the catalytic conversion of macromolecules. It is easy to support catalysts or carry out functional modification; (2) the neat and orderly arrangement of pores can reduce the diffusion resistance of substances; (3) the thermal stability of the pore structure is strong; Inconsistent shrinkage leads to closure; (4) It is easy to build a pore wall with a specific composition; its composition can be metals, metal oxides, multi-component cry...
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IPC IPC(8): C01G41/02
CPCC01G41/02C01P2002/72C01P2004/04C01P2004/30
Inventor 王硕白夏夏张辉张婷婷
Owner BEIJING JIAOTONG UNIV