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Solid nanometer catalyst and applications thereof in cellulose hydrolysis

A nano-catalyst and cellulose technology, applied in the direction of physical/chemical process catalyst, application, sugar production, etc., to achieve the effect of stable structure, low concentration and high relative concentration

Inactive Publication Date: 2012-12-05
XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the special physical structure and chemical properties of magnesium aluminum hydrotalcite, using its anion exchangeability, cation exchangeability and high catalytic activity, a kind of magnesium aluminum hydrotalcite with high catalytic activity was prepared by activating magnesium aluminum hydrotalcite with alkaline aqueous solution. Solid nano-catalyst, and this catalyst is applied to cellulose hydrolysis technology, there is no relevant report in this respect at present

Method used

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  • Solid nanometer catalyst and applications thereof in cellulose hydrolysis
  • Solid nanometer catalyst and applications thereof in cellulose hydrolysis
  • Solid nanometer catalyst and applications thereof in cellulose hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] n(Mg): n(Al) = 2:1 solid nano-catalyst preparation and application in cellulose hydrolysis process, n is the number of moles:

[0034] Press n[Mg(NO 3 ) 2 ] : n[Al(NO 3 ) 3 ] = 2:1, n[urea]: n[metal ion] =5, n[H 2 O] : n[urea] =10 to make a mixed solution, the mixed solution was evenly stirred and reacted at 105°C for 12 h, then the reaction solution was left to stand at 105°C for 12 h, then the precipitate was centrifuged, washed, and the precipitate Ca(OH) at pH = 12.84 at 150°C 2 Activated in the solution for 6 h, centrifuged, washed, dried and ground into a powder <100 μm to obtain an active solid nanocatalyst.

[0035] Cellulose powder and water are uniformly mixed at a mass ratio of 1:15 to make a homogenate. The homogenate is heated to 150°C, and an active solid nano-catalyst is added. The mass ratio of the catalyst to cellulose is 1:2, and the stirring speed is 300 rpm to catalyze the reaction. The hydrolysis of cellulose was completed in 24 h, and the unh...

Embodiment 2

[0037] Repeat embodiment 1, have following difference: press cellulose powder and water to mix evenly with mass ratio 1: 2, add active solid nano-catalyst, catalyst and cellulose mass ratio are 1: 10, setting stirring speed is 600 rpm, And the homogenate was heated to 300° C. for 0.1 hour reaction, and the cellulose hydrolyzate was obtained after the reaction. The hydrolysis rate of cellulose measured by TOC was 62%, and the relative content of glucose in the hydrolyzate was determined by HPLC to be 36%.

Embodiment 3

[0039] Repeat embodiment 1, have following difference: press cellulose powder and water to mix evenly with mass ratio 1: 10, add active solid nano-catalyst, catalyst and cellulose mass ratio are 1: 1, setting stirring speed is 50 rpm, And the homogenate was heated to 100°C for 24 hours. The hydrolysis rate of cellulose measured by TOC was 12%, and the relative content of glucose in the hydrolyzate was determined by HPLC to be 45%.

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Abstract

The invention discloses a solid nanometer catalyst and applications thereof in cellulose hydrolysis. A magnesium aluminium hydrotalcite is prepared by metallic salt and a precipitator co-precipitation method; and subsequently the prepared magnesium aluminium hydrotalcite is arranged in an alkaline aqueous solution and is activated, thus obtaining a required nanometer solid catalyst. When the solid nanometer catalyst is applied to the cellulose hydrolysis, cellulose is crushed and uniformly mixed with the nanometer solid catalyst and a mixture is subsequently mixed with water to prepare homogenate; the homogenate is quickly heated to the temperature of 100 to 300 DEG C and is subsequently mixed forcibly; and then carrying out catalytic reaction on the homogenate for 0.1 to 24 hours, thus completing hydrolysis. After the hydrolysis reaction is finished, the catalyst can be quickly separated from the hydrolysate by a centrifuging or filtering method. The solid nanometer catalyst has highcellulose hydrolysis ratio; furthermore, glucose in the hydrolysate has high relative concentration; and simultaneously the nanometer solid catalyst can be easily separated from the cellulose hydrolysate; therefore, the production cost can be effectively reduced, and the solid nanometer catalyst has good market application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and application, and in particular relates to a new solid nanometer catalyst. At the same time, the invention also relates to the application of the solid nanometer catalyst in cellulose hydrolysis. Background technique [0002] Due to the gradual depletion of fossil energy, increasing energy demand and increasingly important environmental protection, people are increasingly aware of the urgency of seeking clean and renewable energy. The United Nations Industrial Development Organization once stated at the ethanol symposium organized in Vienna: "Ethanol should be regarded as a permanent and alternative source of fuel and chemical raw materials." [0003] With the industrialized production of fuel ethanol, most of the fuel ethanol producing countries such as Brazil, the United States and China use sugarcane, corn and other crops as raw materials, which leads to the problem of "competi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/10C13K1/02
Inventor 方真张帆邓欣郭锋
Owner XISHUANGBANNA TROPICAL BOTANICAL GARDEN CHINESE ACAD OF SCI