Acidified mesoporous WO3/SiO2 multi-component colloidal sphere and application thereof

Abstract

The invention discloses an acidified mesoporous WO3 / SiO2 multi-component colloidal sphere, belonging to the field of chemical catalysts. An active component of the colloidal sphere is SO4<2-> / WO3 / SiO2 of which the structure is like a colloidal sphere; the active component has a mesoporous structure and is high in dispersion property; the particle size is 100-900nm, and the aperture is 3-5nm. The acidified mesoporous WO3 / SiO2 multi-component colloidal sphere disclosed by the invention is used as the catalyst; during catalysis of the esterification reaction between different long-chain fatty acids and alcohols, the acidified mesoporous WO3 / SiO2 multi-component colloidal sphere is excellent in catalyst performance and high in stability. During esterification reaction in which the long-chain fatty acids are oil acids and the alcohols are methanol, and when the using amount of the colloidal sphere catalyst is 3 percent, the esterification rate of the oil acid can reach 97.0 percent; after the oil acids are continuously and cyclically used for 5 times, the conversion rate of the oil acids can be still kept at about 97 percent.

Description

technical field [0001] The invention belongs to the field of chemical catalysts, in particular to an acidified mesoporous WO 3 / SiO 2 Multi-component nanocomposite material and its preparation technology, especially an acidified mesoporous WO with good dispersion, controllable shape and particle size 3 / SiO 2 Multi-component colloidal ball and its preparation technology. The acidified mesoporous WO prepared by the present invention 3 / SiO 2 Multi-component colloidal spheres are used as catalysts to catalyze the esterification of long-chain fatty acids, and have achieved good catalytic effects. Background technique [0002] Multi-component hybrid materials with controllable morphology and composition have great potential application value in the fields of catalysis, solar energy conversion and photoelectric technology (P.Li, et al.Au-ZnO Hybrid Nanopyramids and Their Photocatalytic Properties, J.Am.Chem.Soc.2011,133,5660-5663; T.Yu, et al.AqueousPhase Synthesis of Pt / Ce...

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Problems solved by technology

(Julien Polleux, et.al., Template-Free Synthesis and Assembly of Single-Crystalline Tungsten Oxide Nanowires and their Gas-SensingProperties, Angew.Chem.Int.Ed.2005, 44, 267-271.) The literature reports close to this patent have : Wu et al. (Effects of tungsten oxide on the activity and thermal stability of a sulfate-derived titania supported platinum catalyst for propane oxidation) prepared multicomponent Pt / WO by isometric impregnation 3 / TiO 2 Catalyst, Zhang et al. (L. Zhang, et.al., Facilesynthesis and photocatalytic activity of hierarchical WO 3 core-shell microspheres, Applied Surface Science, 2011, 258, 1719-1724) prepared core-shell WO 3 Microspheres, and Liu et al. (J.Liu, et.al., Novel MoO 3 and WO 3 hollow nanospheres assembled with polymeric micelles, Materials Letters, 2012,66,25-28) prepared WO 3 Hollow balls, they either put WO 3 Loaded on a carrier with a relatively large specific surface area, or to prepare WO of different forms 3 , while the acidified mesoporous WO 3 / SiO 2 Multi-component colloidal balls have not been reported

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