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Glucose isomerization molecular sieve catalyst and preparation method thereof

A molecular sieve and isomerization technology, applied in the field of glucose isomerization molecular sieve catalyst and its preparation, can solve the problems of long synthesis time, low glucose conversion rate, poor catalyst reusability, etc., and achieve short synthesis time and high glucose conversion rate. and fructose yield, good catalytic activity

Inactive Publication Date: 2017-04-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems in the prior art, such as long synthesis time of Sn-Beta molecular sieve catalyst hydrothermal method, low glucose conversion rate, poor catalyst reusability, etc., to provide a kind of catalyst with short synthesis time, good catalytic performance and thermal stability , and the reusable hierarchical porous Sn-Beta molecular sieve catalyst is the glucose isomerization catalyst

Method used

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  • Glucose isomerization molecular sieve catalyst and preparation method thereof
  • Glucose isomerization molecular sieve catalyst and preparation method thereof
  • Glucose isomerization molecular sieve catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Preparation of dealuminated molecular sieve

[0035] (1) With sodium metaaluminate as the aluminum source, silica sol as the silicon source, and TMAOH as the template, the hydrothermal synthesis method synthesizes Al-Beta zeolite; in the reaction mixture, there is Al in molar ratio 2 o 3 :SiO2 2 :TEAOH:H 2 O=1:50:18:1000;

[0036] (2) The obtained Al-Beta zeolite was mixed with 6mol L -1 HNO 3Mix according to the solid-liquid ratio of zeolite and acid at 1:30g / ml, reflux at 80°C for 6 hours, filter, wash until neutral, and dry at 100°C to obtain high-silica zeolite, which is recorded as : De-Al-Beta.

Embodiment 2

[0038] Preparation of Hierarchical Zeolite Molecular Sieves

[0039] (1) De-Al-Beta is used as the silicon source, and SnCl 4 ·5H 2 O is the tin source, 6g of De-Al-Beta and 0.42g of SnCl 4 ·5H 2 O was dissolved in TEAOH, stirred and mixed for 6h to form a sol; take 0.74g of NH 4 F was dissolved in 1.4g deionized water to form a solution, added dropwise to the above sol, stirred and mixed for 2 hours to form a viscous colloid; the obtained viscose was transferred to a hydrothermal synthesis kettle, and the first water After 24 hours of thermal crystallization, the Sn-Beta primary crystal was obtained, taken out, and cooled to room temperature for later use; in the first hydrothermal crystallization, the molar ratio of each substance was SiO 2 :SnO 2 :(TEA)O 2 :NH 4 F:H 2 O=1:0.012:0.27:0.2:7.5;

[0040] (2) Mix and dissolve the obtained Sn-Beta primary crystal with 8.74g of cetyltrimethylammonium bromide (CTAB) and 1.82g of tetramethylammonium hydroxide (TMAOH) in dei...

Embodiment 3

[0043] Preparation of Hierarchical Sn-Beta Molecular Sieves with Different Times of Acid Treatment

[0044] The Al-Beta molecular sieves synthesized in Example 1 were treated with nitric acid 1 to 5 times respectively, and were respectively denoted as De-Al-Beta-1, De-Al-Beta-2, De-Al-Beta-3, De-Al- Beta-4, De-Al-Beta-5;

[0045] The Al-Beta molecular sieves of different acid treatment times are prepared into different multi-stage Sn-Beta molecular sieves according to embodiment 2, denoted as: Sn-Beta-1, Sn-Beta-2, Sn-Beta-3, Sn-Beta -4, Sn-Beta-5.

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Abstract

The present invention discloses a glucose isomerization molecular sieve catalyst and a preparation method thereof. The preparation method comprises: (1) carrying out dealumination treatment on prepared Al-Beta zeolite by using an acid to obtain high silicon zeolite; (2) dissolving the high silicon zeolite and a tin source in an organic alkali to form an amorphous sol, and carrying out first hydrothermal crystallization to form a Sn-Beta primary crystal; and (3) carrying out second hydrothermal crystallization on the Sn-Beta primary crystal under the assist of a mesoporous templating agent, cooling, washing, drying, and calcining to obtain the glucose isomerization molecular sieve catalyst. According to the present invention, with the application of the prepared glucose isomerization molecular sieve catalyst in the isomerization reaction of glucose, the higher glucose conversion rate and the high fructose yield are obtained; and the preparation method has characteristics of cheap and easily available raw material and rapid synthesis, and the prepared glucose isomerization molecular sieve catalyst has good reusability.

Description

technical field [0001] The invention relates to a catalyst for glucose isomerization reaction, in particular to a glucose isomerization molecular sieve catalyst and a preparation method thereof. Background technique [0002] Glucose is the most abundant monosaccharide in nature, and fructose is an isomer of glucose. In the conversion of biomass, cellulose can be hydrolyzed to obtain glucose molecules, and then undergo glucose isomerization and fructose dehydration into important platform compound. Fructose, which is an isomer of glucose, is an important sugar in nature and has great uses in the food industry, such as the production of diet sugar. In addition, because fructose can synthesize furan compounds including 5-hydroxymethylfurfural (HMF), fine chemicals can be synthesized through various chemical reactions including hydrogenation, hydrolysis or polymerization. However, since the storage of fructose in nature is lower than that of glucose, and fructose has an advant...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07H1/00C07H3/02
CPCB01J29/7057B01J2229/183C07H1/00C07H3/02
Inventor 周彦斌庄军平王兰英
Owner SOUTH CHINA UNIV OF TECH
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