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Method for catalytic oxidation degradation of wood chips by novel polyoxometallate

A polyoxometalate, catalytic oxidation technology, applied in chemical instruments and methods, catalyst activation/preparation, preparation of organic compounds, etc., can solve the problems of low reaction selectivity and difficult catalyst separation.

Active Publication Date: 2018-10-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyoxometalate catalysts for catalytic oxidation degradation of wood chips are concentrated in the Keggin structure and water system, resulting in low reaction selectivity and difficulty in catalyst separation. In addition, the catalytic degradation efficiency of lignin in wood chips has been further improved space

Method used

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  • Method for catalytic oxidation degradation of wood chips by novel polyoxometallate
  • Method for catalytic oxidation degradation of wood chips by novel polyoxometallate

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of Keggin-type polyoxometalates: Taking silicotungstic acid as an example, dissolve 198g of sodium tungstate in 250ml of water at 50°C, add 240ml of 3M HCl, and add 100ml of an aqueous solution containing 11g of sodium silicate under vigorous stirring. Adjust the pH to 1 with HCl, concentrate the solution down to 400ml at 80°C, then adjust the solution to pH 2 with KOH, add a large amount of KCl, filter, dry the filter cake, and recrystallize to obtain the silicotungstic acid catalyst. Phosphomolybdic acid, silicomolybdic acid, and phosphotungstic acid are obtained by the same method.

Embodiment 2

[0030] Dawson-type polyoxometalates P 2 W 18 Preparation: mix 62.5g sodium tungstate with 52.5ml phosphoric acid, reflux for 1 hour, gradually add hydrogen peroxide dropwise to the mixed solution, react for 0.5h, cool to room temperature, add 25g NH 4 Cl, filter, dissolve the filter cake in 150ml water, add 25g KCl, let stand overnight, filter with Buchner funnel and wash with water three times, the solid is recrystallized under water at 65°C to obtain Dawson type polyoxometalate P2W18.

Embodiment 3

[0032] Notched Dawson-type polyoxometalates P 2 W 17 Preparation of: 40g P 2 W 18 Dissolve in water, add dropwise to the solution containing 10g KHCO 3After stirring vigorously at room temperature for 2 hours, filter, and the filter cake was recrystallized twice in hot water to obtain an angled Dawson type heteropolyacid P 2 W 17 .

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Abstract

The invention provides a method for catalytic oxidation degradation of wood chips by a novel polyoxometallate composite catalyst. The method comprises the following steps: blending wood chips, the catalyst and a solvent, and catalytically oxidatively degrading wood chips in an oxygen atmosphere, at a certain pressure and at a certain temperature to obtain oxidation products. The catalyst is a polyoxometallate / hydrotalcite composite catalyst containing two active centers: one catalytic active center is one or more acids selected from the group consisting of Keggin-type polyoxometallate phosphotungstic acid, silicotungstic acid, phosphomolybdic acid and silicon molybdenum; and the other catalytic active center is selected from one or more of the Dawson type, the notched Dawson type and the heteroatom-substituted Dawson type polyoxometallates. The reaction products include aromatic aldehyde and ketone compounds. Compared with the prior art, the invention relates to a novel polyoxometallate / hydrotalcite composite catalyst for high-efficiency catalytic oxidation degradation of wood chips to generate aromatic aldehyde and ketone compounds. According to the invention, an organic solvent such as alcohol is selected as a reaction medium; wood chips, a catalyst and a small molecule compound are directly separated by centrifugation; and the extraction process is avoided. The conditions are mild, the operation is simple, and the catalyst is cheap and easily available.

Description

technical field [0001] The invention relates to a method for catalyzing and oxidatively degrading sawdust with a novel polyoxometalate composite catalyst, which belongs to the technical field of biomass energy. Background technique [0002] Fossil resources such as coal and petroleum have always been the main source of fuel and chemical raw materials. However, with the depletion of traditional resources and the increasing environmental problems, it is particularly urgent to find green, environmentally friendly and sustainable alternatives to fossil resources. Biomass refers to all growable organic substances produced through photosynthesis using the atmosphere, water, and land. In a narrow sense, biomass includes stalks, trees, and agricultural processing wastes other than grain, fruits, and seeds, and is a green, widely distributed renewable resource. [0003] Sawdust is an important biomass resource, which widely exists in the plant kingdom, and is also one of the importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/51C07C45/60C07C47/52C07C49/76B01J27/19B01J27/188B01J31/18B01J37/02B01J27/236
CPCB01J27/188B01J27/19B01J27/236B01J37/0201C07C45/51C07C45/60C07C47/52C07C49/76
Inventor 师楠刘东温福山陈清泰李敏殷长龙陈坤黄强娄斌于冉龚鑫张智琛蒋瑞雪
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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