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Preparation method of heteropoly acid/metal oxide composite nano fiber

A technology of composite nanofibers and nanofibers, which is applied in fiber treatment, fiber chemical characteristics, rayon manufacturing, etc. It can solve the problems of difficulty in ensuring the quality and stability of catalysts, the reduction of specific surface area of ​​composite materials, and the influence of catalytic activity of heteropolyacids. , to achieve the effect of improving catalytic efficiency, increasing specific surface area and low cost

Active Publication Date: 2013-09-04
CHANGSHU ZHAOSHI HUADA DYEING & FINISHING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

where Al 2 o 3 Carriers with strong alkalinity such as MgO and MgO are easy to degrade heteropolyacids, and are generally not suitable as carriers for heteropolyacid loading; nanoparticles such as activated carbon have large surface energy and are prone to agglomeration, resulting in a decrease in the specific surface area of ​​the composite material and affecting Heteropolyacid catalytic activity; and heteropolyacid supported on silica gel is easy to dissolve
[0004] In the prior art so far, supported heteropolyacid catalysts are mostly obtained by carrier impregnation or electrodeposition of heteropolyacid solutions, but generally the solubility of heteropolyacid salts in polar solvents is small, so using carrier impregnation or The method of depositing heteropolyacid salt aqueous solution is difficult to regulate the loading range when preparing the heteropolyacid salt catalyst supported by the carrier, which makes it difficult to guarantee the quality and stability of the prepared catalyst

Method used

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  • Preparation method of heteropoly acid/metal oxide composite nano fiber
  • Preparation method of heteropoly acid/metal oxide composite nano fiber
  • Preparation method of heteropoly acid/metal oxide composite nano fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Weigh 9.0 g of polyvinyl alcohol (PVA), and dissolve it in 100 mL of 2% acetic acid aqueous solution with a volume ratio of 2% in a water bath at 80°C under constant temperature and mechanical stirring to prepare a 9% PVA sol. Mix 1.2 grams of phosphotungstic acid (PWA) with 1.2 grams of Zn(Ac) 2 Dissolve in 10mL deionized water, mix with 30mL of the above PVA sol, and prepare uniform and transparent PWA-Zn(Ac) in a water bath at a constant temperature of 50°C and mechanical stirring 2 - PVA precursor solution.

[0055] Electrospinning technology is used to prepare nanofiber membrane. The spinning voltage was 20 kV, the flow rate of the spinneret solution was 0.6 ml / hour, and the receiving distance was 15 cm. PWA-Zn(Ac) to be received 2 - PVA was heat-treated at 80° C. for 12 hours, and then calcined at 400° C. in an air atmosphere for 2 hours in a tube furnace to obtain PWA-ZnO composite nanofibers.

[0056] The scanning electron microscope (SEM) pictures of the ob...

Embodiment 2

[0058] Weigh 9.0 g of polyvinyl alcohol (PVA), and dissolve it in 100 mL of 2% acetic acid aqueous solution with a volume ratio of 2% in a water bath at 80°C under constant temperature and mechanical stirring to prepare a 9% PVA sol. Mix 1.0g of silicotungstic acid (HSiW) with 1.2g of Zn(Ac) 2 Dissolve in 10mL deionized water, mix with 30mL of the above PVA sol, and prepare uniform and transparent HSiW-Zn(Ac) in a water bath at a constant temperature of 50°C and mechanical stirring 2 - PVA precursor solution.

[0059] Electrospinning technology is used to prepare nanofiber membrane. The spinning voltage was 20 kV, the flow rate of the spinneret solution was 0.6 ml / hour, and the receiving distance was 15 cm. HSiW-Zn(Ac) to be received 2 -PVA was heat-treated at 80°C for 12 hours, and then fired in an air atmosphere at 400°C for 2 hours in a tube furnace to obtain HSiW-ZnO composite nanofibers.

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Abstract

The invention discloses a preparation method of a heteropoly acid supported metal oxide nano fiber. The fiber takes metal oxide a supporter and heteropoly acid as an active component, wherein the weight ratio of the oxide supporter and the heteropoly acid is 1:(0.4-1). The preparation method comprises the following steps: a) spinning a compound precursor containing heteropoly acid and metal acetate to prepare a nano fiber containing the heteropoly acid / metal acetate precursor; and b) performing roasting treatment on the nano fiber containing the heteropoly acid / metal acetate precursor at 300-450 DEG C to obtain the heteropoly acid / metal oxide composite nano fiber. The fiber keeps the structural features of the heteropoly acid itself, and combines the characteristics of the nano fiber such as large specific area, high dispersity and the like; and the preparation method is simple and low in cost.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to a method for preparing heteropolyacid / metal oxide composite nanofibers. Background technique [0002] Heteropoly acid (Heteropoly Acid, abbreviated as HPA) is a class of heteroatoms (such as P, Si, Fe, Co, etc.) and polyatoms (such as Mo, W, V, Nb, Ta, etc.) Oxygen-containing polyacids composed of atomic coordination bridges have high catalytic activity, acidity, and redox properties, and are a new multifunctional green catalyst. The catalytic performance can be systematically tuned by selecting the constituent elements (coordinating atoms, central atoms, and counterions) without changing the heteropolyanion structure. At the same time, multi-acid catalysts have the advantages of high selectivity, low corrosion, mild reaction conditions and multi-functionality (acid, oxidation, photoelectric catalysis), etc., and have very broad applications in the fields of catalysi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/10D01F1/10D01D5/00
Inventor 尹凡吴静萍陆敏胡兵俞良
Owner CHANGSHU ZHAOSHI HUADA DYEING & FINISHING
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