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A kind of reduction method of polyol hydrogenolysis catalyst, catalyst and application

A technology of catalysts and polyols, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of low conversion rate and selectivity, and achieve high selectivity , high conversion rate and low reduction temperature

Active Publication Date: 2022-08-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the above reaction, the conversion rate and selectivity of glycerol hydrogenolysis to 1,3-propanediol are low, which may be related to the reduction method of the catalyst

Method used

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  • A kind of reduction method of polyol hydrogenolysis catalyst, catalyst and application
  • A kind of reduction method of polyol hydrogenolysis catalyst, catalyst and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The catalyst used is Pt / WO 3 , its composition is Pt metal mass content of 2wt%, WO 3 as a carrier. The catalyst is prepared by an equal volume impregnation method. The specific preparation steps include: loading the precursor solution of the active component Pt (chloroplatinic acid solution) on the tungsten oxide carrier by the equal volume impregnation method, the impregnation time is 12h, and then the 60 ℃ oven After drying for 6h, the obtained catalyst was recorded as Pt / WO 3 . Pt / WO using a tank reactor 3 The catalyst is reduced. The specific process is: disperse 1 g of the catalyst in an ethanol solution, the concentration of sodium borohydride is 0.05 mol / L, the reduction pressure and temperature are 0.1 MPa and 25 °C, respectively, and the reduction is stirred with a magnetic stirrer at a stirring rate of 800 rpm. . After the reduction, vacuum drying was performed at 60 °C for 6 h. The catalyst catalyzes the conversion of glycerol in the kettle type reacto...

Embodiment 2

[0023] The concentration of sodium borohydride solution was changed to 0.01mol / L, and other conditions were the same as in Example 1.

Embodiment 3

[0025] The concentration of sodium borohydride solution was changed to 1.0 mol / L, and other conditions were the same as in Example 1.

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Abstract

The invention relates to an optimized reduction method of a polyol hydrogenolysis catalyst. The catalyst consists of a carrier A and an active component B, and the carrier A is one of aluminum oxide, molybdenum oxide, tungsten oxide, silicon oxide, titanium oxide or cerium oxide. The active component B is one of the precious metals platinum, palladium, rhodium and gold. By combining sodium borohydride aqueous solution or alcohol solution as reducing agent, the concentration of sodium borohydride solution is 0.01mol / L~2.0mol / L, the reduction pressure is 0.1MPa, the reduction temperature is 5℃~70℃, and the stirring speed is 200rpm~ 1500 rpm, and the reduction was carried out under the conditions of light and no light, respectively. The mixed solution of the reducing agent and the catalyst is reduced under magnetic stirring, and the high-valence metal elements in the catalyst are reduced to low-valence active metal elements or metal nanoparticles. Aggregation, growth and uneven distribution during high temperature reduction. The catalyst can catalyze the production of 1,3 propylene glycol with high conversion rate and high selectivity of glycerol.

Description

technical field [0001] The invention relates to an optimized reduction method of a polyol hydrogenolysis catalyst. Mainly used for the reduction of catalysts for the preparation of 1,3-propanediol by hydrogenolysis of glycerol. technical background [0002] In recent years, with the rapid development of biodiesel, a large amount of biodiesel by-product-glycerol is produced. Converting these crude glycerols into high value-added chemicals has received extensive attention from researchers. The direct hydrogenolysis of glycerol produces high value-added 1,3-propanediol. 1,3-propanediol can be used as a synthetic raw material for antifreeze, plasticizer, detergent, preservative and emulsifier, and is used in food, cosmetics and pharmaceutical industries. . At present, the most important use of 1,3 propylene glycol is to produce a new type of polyester-polytrimethylene terephthalate (PTT for short). As a new biodegradable polyester, PTT overcomes the shortcomings of too hard ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/16B01J23/652B01J23/68C07C29/58C07C31/20
CPCB01J37/16B01J23/6527B01J23/687C07C29/58C07C31/205Y02P20/584
Inventor 王爱琴周茂祥雷念杨曼
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI