Method and catalyst for preparing ethanol from lignocellulosic biomass in one step

A technology of lignocellulose and catalysts, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, and preparation of hydroxyl compounds. It can solve the problems of low carbon yield of target products, easy repolymerization of oligomers or small molecules, and achieve Hydrothermal stability Recyclable, high hydrothermal stability, simple process effect

Active Publication Date: 2019-02-26
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing method requires multi-step reactions to produce ethanol from cellulose, and at the same time, the depolymerization of cellulose needs to be completed at a relatively high temperature, and in the high temperature and complex multi-step reaction process, the cellulose depolymerization obtained Oligomers or small molecules are easy to polymerize again, resulting in a lower carbon yield of the target product

Method used

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  • Method and catalyst for preparing ethanol from lignocellulosic biomass in one step
  • Method and catalyst for preparing ethanol from lignocellulosic biomass in one step
  • Method and catalyst for preparing ethanol from lignocellulosic biomass in one step

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Preparation of 5%Ru-25%WOx / HZSM-5 Bimetallic Heterogeneous Catalyst

[0048] According to the aforementioned general method, 155.8 mg of RuCl 3 Hydrate and 402.4mg of (NH 4 ) 6 h 2 W 12 o 40 The hydrate was dissolved in 120 g of distilled water to obtain an aqueous solution, and 1.2 g of HZSM-5 molecular sieve was ground and dispersed in water to obtain a dispersion. Then the obtained aqueous solution was added to the obtained dispersion, and after stirring at 60°C for 15h, the solvent was removed by rotary evaporation, followed by drying at 100°C for 8h, and finally the obtained catalyst precursor was placed in a 600°C Reduction in hydrogen atmosphere for 3h, thus obtaining the desired bimetallic heterogeneous catalyst.

[0049] By an elemental analyzer, it is determined that the mass content of metal Ru in the obtained bimetallic heterogeneous catalyst is 5%, and the mass content of metal W is 25%, that is, 5%Ru-25%WOx / HZSM-5 bimetallic heterogeneous catalyst. ...

Embodiment 2

[0053]With the same preparation and characterization procedures as in Example 1, except changing the amount of supported metal and the type and amount of support, the mass fraction of metal Ru shown in Table 1 was prepared at 0.5%-10% and the mass fraction of metal W was at 10%-30% bimetallic heterogeneous catalyst. Moreover, the results of XRD characterization and TEM characterization (pattern not shown) are similar to those of Example 1 above.

Embodiment 3

[0055] With the same preparation and characterization procedures as Example 1 and / or according to the aforementioned general method, except using H 2 PtCl 6 and Ce(NH 4 ) 2 (NO 3 ) 6 And change the dosage and the type and dosage of the carrier to prepare the bimetallic heterogeneous catalyst with the mass fraction of metal Pt at 0.5%-10% and the mass fraction of metal Ce at 10%-30% as shown in Table 1. Moreover, the results of XRD characterization and TEM characterization (pattern not shown) are similar to those of Example 1 above.

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Abstract

The invention relates to a method and a catalyst for preparing ethanol from lignocellulosic biomass in one step. The method comprises the step of enabling lignocellulosic biomass to react with hydrogen in a solvent in the presence of the catalyst, wherein the solvent is water, a mixture of water and alkanes, alcohols or acids, or a mixture of acids and alkanes or alcohols; and the catalyst consists of a hydrogenation metal and a metal oxide or the hydrogenation metal and the metal oxide as well as carriers. By utilizing the method and the catalyst provided by the invention, ethanol can be produced in one step from lignocellulosic biomass with high conversion and high selectivity, and a new way to produce ethanol from lignocellulosic biomass feedstock in one step through catalysis is provided. In addition, the method provided by the invention has the advantages of simple process, simple reaction equipment, simple and convenient operation and mild reaction conditions, and the catalyst provided by the invention is cheap, easy to obtain and high in hydrothermal stability, can be recycled, is suitable for industrial production, and has a very broad application prospect.

Description

technical field [0001] The invention relates to a method and a catalyst for one-step preparation of ethanol from lignocellulosic biomass raw materials. Background technique [0002] Biomass is the only renewable source of organic carbon and is ideal as an alternative to petroleum for the production of fuels and chemicals. Therefore, the development of new routes and methods for the conversion of biomass to fuels and chemicals is an important goal for the development of future sustainable energy systems. [0003] At present, the production method of ethanol or alcohol from cellulose raw materials is mainly biochemical method, that is, the technology of hydrolyzing cellulose to produce fermentable monosaccharides, and then producing fuel ethanol through microbial fermentation, but this method is costly and long-term, and ethanol The concentration is low, and it is difficult to meet the basic requirements of subsequent rectification. At present, the production of ethanol by c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J23/888B01J27/224B01J27/24B01J29/12B01J29/14B01J29/44B01J29/48B01J29/74C07C29/00C07C31/08
CPCB01J23/72B01J23/888B01J27/224B01J27/24B01J29/126B01J29/146B01J29/44B01J29/48B01J29/7415B01J2229/18C07C29/00C07C31/08
Inventor 张颖李闯傅尧
Owner UNIV OF SCI & TECH OF CHINA
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