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Polyoxometallate-based multifunctional catalyst and preparation method

A polyoxometalate, multifunctional technology, applied in the field of catalysts and their preparation, can solve problems such as limiting catalytic activity

Inactive Publication Date: 2009-12-30
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

[0003] However, due to the preparation of Ta 2 o 5 / SiO 2 -[H 3 PW 12 o 40 / R] uses an organosilane containing a silicon atom [(CH 3 CH 2 O) 3 Si-R] provides a hydrophobic functional group, thus, the hydrophobic functional group R is located inside the pores of the composite material, as a result, while improving the surface hydrophobicity of the catalyst, the diameter and uniformity of the pores are reduced and the pores are partially blocked, ultimately limiting its catalytic activity. play

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  • Polyoxometallate-based multifunctional catalyst and preparation method

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[0022] Dissolve P123 (0.17-0.19mmol) in ethanol (172-190mmol) and stir to obtain a clear solution; TaCl 5 Add it to the above P123 / ethanol solution, and continue to stir vigorously for 1 hour at room temperature; add H 3 PW 12 o 40 aqueous solution and quantitative bis(triethoxy)ethylsilane or bis(triethoxy)phenylsilane, and continue to stir for 1 hour. During the synthesis, the total molar number of Ta and Si was kept at 5 mmol, and the molar percentages of the bridged organosilane were 0, 10, 20, 40, 60 and 80 mol%, respectively. The transparent sol obtained above was aged at 40°C for 24 hours, then the generated hydrogel was transferred to the reactor and sealed, and the reactor was raised to 80°C at a heating rate of 2°C / min and kept for 48 hours . Then, the product obtained in the reactor was slowly dehydrated at 45° C. under vacuum for 24 hours, and then the temperature was raised to 60° C. and 80° C. for 2 hours each to continue to compact the skeleton of the produc...

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Abstract

A polyoxometallate-based multifunctional catalyst and a preparation method belong to the chemical industry field. The catalyst comprises the following formula: Ta2O5 / Si(R)Si-H3PW12O40, wherein, R=-CH2CH2- or -C6H4-. The preparation method comprises the following steps: taking bridged organosilane-bis(trialkoxy)ethyl or phenylsilane [(CH3CH2O)3Si-R-Si(OCH2CH3)3, R=-CH2CH2- or -C6H4-] as a silica source, tantalum pentachloride (TaCl5) as a tantalum source, polyoxometallate (H3PW12O40) with Keggin structure as an inorganic former body and a nonionic surfactant Pluronic P123[HO(CH2CH2O)20(CH2CH(CH3)O)70(CH2CH2O)20H)] as a structure-directing agent to prepare the tantalum pentoxide supported polyoxometallate-based catalyst with skeleton containing bridged hydrophobic alkyl by one-step sol-gel cocondensation and combination with the solvent heat treatment technology. The improvement effect of the catalytic property of the catalyst is very obvious and the life of the catalyst is prolonged.

Description

Technical field: [0001] The invention belongs to the field of chemical industry and relates to a catalyst and a preparation method thereof. Background technique: [0002] Polyoxometalates have attracted extensive attention due to their acidity, redox and catalytic properties. Due to the small specific surface area of ​​polyacids and their easy solubility in polar solvents, the immobilization of homogeneous polyacid catalysts is an effective way to realize their application, and the catalytic performance of polyacids can be greatly improved by immobilization. Among the reported supported polyoxometalates, tantalum pentoxide supported polyoxometalates (H 3 PW 12 o 40 / Ta 2 o 5 ) has high acid catalytic performance (L.Xu, Y.Wang, X.Yang, Xi.Yu, Y.Guo, J.H.Clark, Green Chem., 2008, 10, 746-755), but this catalyst is for The activity of catalyzing reactions involving water or generating water, such as esterification and transesterification (biodiesel synthesis reaction), ne...

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Application Information

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IPC IPC(8): B01J31/36B01J31/22C11C3/10C11C3/00C07C69/24C07C67/08C07C69/58C07C69/587C07C67/03
Inventor 郭伊荇袁星霍明昕许蕾蕾杨霞李威马凤延
Owner NORTHEAST NORMAL UNIVERSITY
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