Catalyst for one step conversion of cellulose into sorbitol

A catalyst and functionalization technology, applied in clean catalysis and green fields, can solve the problems of increasing safety hazards and increasing costs, and achieve the effects of reduced separation, simple preparation, and cheap and easy-to-obtain raw materials

Inactive Publication Date: 2013-10-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above catalysts show good catalytic activity and selectivity in the reaction, but the high temperature and high pressure are involved in the reaction process, which will increase the cost of application on the one hand, and increase safety hazards on the other hand

Method used

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  • Catalyst for one step conversion of cellulose into sorbitol
  • Catalyst for one step conversion of cellulose into sorbitol

Examples

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example 1

[0019] Example 1: Preparation of ruthenium-supported sulfonic acid functionalized silica catalyst

[0020] Step 1. Preparation of mercapto-functionalized silica gel: reflux and stir 10 g of silica gel and 1 mmol of 3-mercaptopropyltrimethoxysilane in dry toluene for 18 h. The obtained solid material was washed with hot toluene in a Soxhlet extractor for 12 h, and finally the washed solid material was dried in a vacuum oven at 110° C. overnight. A mercapto-functionalized silica material is obtained.

[0021] Step 2. Preparation of sulfonic acid-functionalized silica gel: take 5 g of the previously prepared mercapto-functionalized silica material, add 50 mL of 30% H 2 o 2 Hydrogen peroxide, 2 drops of concentrated sulfuric acid and 15 mL of methanol were stirred at room temperature for 12 h (oxidation of mercapto functional groups to sulfonic acid functional groups). The above mixture was filtered with suction, and the filter cake was washed with 50 mL of deionized water. In...

example 2

[0023] Example 2: Preparation of ruthenium-supported sulfonic acid functionalized silica catalyst

[0024] Step 1. Preparation of mercapto-functionalized silica gel: reflux and stir 10 g of silica gel and 3 mmol of 3-mercaptopropyltrimethoxysilane in dry toluene for 18 h. The obtained solid material was washed with hot toluene in a Soxhlet extractor for 12 h, and finally the washed solid material was dried in a vacuum oven at 110° C. overnight. A mercapto-functionalized silica material is obtained.

[0025] Step 2. Preparation of sulfonic acid-functionalized silica gel: take 5 g of the previously prepared mercapto-functionalized silica material, add 50 mL of 30% H 2 o 2 Hydrogen peroxide, 2 drops of concentrated sulfuric acid and 15 mL of methanol were stirred at room temperature for 12 h (oxidation of mercapto functional groups to sulfonic acid functional groups). The above mixture was filtered with suction, and the filter cake was washed with 50 mL of deionized water. In...

example 3

[0027] Example 3: Preparation of ruthenium-supported sulfonic acid functionalized silica catalyst

[0028]Step 1. Preparation of mercapto-functionalized silica gel: reflux and stir 10 g of silica gel and 7 mmol of 3-mercaptopropyltrimethoxysilane in dry toluene for 18 h. The obtained solid material was washed with hot toluene in a Soxhlet extractor for 12 h, and finally the washed solid material was dried in a vacuum oven at 110° C. overnight. A mercapto-functionalized silica material is obtained.

[0029] Step 2. Preparation of sulfonic acid-functionalized silica gel: take 5 g of the previously prepared mercapto-functionalized silica material, add 50 mL of 30% H 2 o 2 Hydrogen peroxide, 2 drops of concentrated sulfuric acid and 15 mL of methanol were stirred at room temperature for 12 h (oxidation of mercapto functional groups to sulfonic acid functional groups). The above mixture was filtered with suction, and the filter cake was washed with 50 mL of deionized water. In ...

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Abstract

The present invention relates to a dual function catalyst and a preparation method thereof, wherein a sulfonic acid function group is grafted on the surface of the catalyst, and is adopted as an acid to provide acidity for cellulose hydrolysis so as to produce glucose, and the glucose obtained through hydrolysis is subjected to further hydrogenation under a hydrogen gas condition with the supported metal nanoparticles so as to produce sorbitol, such that one step conversion of cellulose into sorbitol under mild reaction conditions is achieved. The catalyst preparation method comprises: 1) preparing a thiol functionalized silica gel: grafting a thiol function group on the surface of a silica gel; 2) preparing a sulfonic acid functionalized silica gel: oxidizing the thiol grafted on the surface into sulfonic acid; and 3) adopting an equal volume impregnation method to prepare the metal nanoparticle-supported sulfonic acid functionalized silica catalyst, wherein the obtained catalyst can be used for conversion of cellulose to prepare sorbitol. The catalyst has characteristics of simple preparation method, low raw material cost, high activity and good stability, and is suitable for cellulose conversion reactions.

Description

Technical field: [0001] The invention relates to the technical field of green and clean catalysis, in particular to a dual-function catalyst (having acid and metal nanoparticles), and applied the prepared catalyst material to the conversion of cellulose to sorbitol. Background technique: [0002] With the depletion of mineral resources such as oil, the effective utilization of renewable resources (biomass resources) has become a major issue that must be solved for the sustainable development of the country. Since the source of biomass energy is very extensive, including starch, edible oil and cellulose, etc., it has become the research goal of the majority of scientific researchers to vigorously develop and convert biomass into raw materials for industrial production. For example, my country produces more than one billion tons of cellulose raw materials annually, of which the annual output of crop straw is as high as more than 500 million tons. Most of the straw is burned...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07C31/26C07C29/00
Inventor 侯震山朱闻闻郁茵茵华丽张然郭立
Owner EAST CHINA UNIV OF SCI & TECH
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