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Method for preparing p-hydroxycinnamate by catalyzing lignin alcoholysis through enzymatic hydrolysis lignin-based hierarchical porous carbon-loaded molybdenum oxide

A lignin-based, molybdenum oxide technology, used in metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, catalyst activation/preparation, etc., can solve the difficulty of catalyst recovery, catalyst and product separation, etc. problem, to achieve the effect of low cost, high price and good matching

Active Publication Date: 2022-07-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method selectively depolymerizes lignin under mild conditions to prepare methyl p-hydroxycinnamate, but using copper metal salt as a homogeneous catalyst has the problems of difficult separation of catalyst and product and difficult recovery of catalyst.

Method used

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  • Method for preparing p-hydroxycinnamate by catalyzing lignin alcoholysis through enzymatic hydrolysis lignin-based hierarchical porous carbon-loaded molybdenum oxide
  • Method for preparing p-hydroxycinnamate by catalyzing lignin alcoholysis through enzymatic hydrolysis lignin-based hierarchical porous carbon-loaded molybdenum oxide
  • Method for preparing p-hydroxycinnamate by catalyzing lignin alcoholysis through enzymatic hydrolysis lignin-based hierarchical porous carbon-loaded molybdenum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of NC Carrier

[0040] Weigh 0.6g of industrial enzymatically hydrolyzed lignin (Shandong Longli Group), 0.1261g of melamine powder with a purity of 99.5%, and 1.4814g of ZnCl with a purity of 99% 2 Solid, 0.6360 g of KOH solid with a purity of 99%, the above four samples were dissolved in 50 mL of absolute ethanol, and ultrasonically treated for 0.5 h. After sonication, add 3g Mg(OH) 2 The powder and 50 mL of anhydrous ethanol were sonicated again for 0.5 h. Then, it was heated and stirred in an oil bath at 60 °C for 5 h, and after the end, the solvent was removed in a rotary evaporator and ground to obtain a yellow-brown powder, that is, the NC precursor. The NC precursor was calcined in a tube furnace at 800 °C for 140 min under an inert gas atmosphere, and cooled to room temperature naturally. Finally, pickle with 1mol / L nitric acid for 2h, and wash with water until neutral after pickling. After dry grinding, a black powdery NC carrier was...

Embodiment 2

[0041] Example 2: Preparation of 10 wt.% Mo / NC catalyst

[0042] Weigh 0.2142g (NH 4 ) 6 Mo 7 O 24 ·4H 2 O, fully dissolved in 20 mL of deionized water, added 1 g of the NC carrier prepared in Example 1, soaked for 12 h, and dried at 80 °C for 12 h. In a tube furnace, N 2 The Mo / NC catalyst was obtained by calcining at 600 °C for 5 h under the atmosphere, and the loading of Mo was 10 wt.%.

Embodiment 3

[0043] Example 3: Preparation of 2.5 wt.% Mo / NC catalyst

[0044] Weigh 0.0480g (NH 4 ) 6 Mo 7 O 24 ·4H 2 O, fully dissolved in 20 mL of deionized water, added 1 g of the NC carrier prepared in Example 1, soaked for 12 h, and dried at 80 °C for 12 h. In a tube furnace, N 2 The Mo / NC catalyst was obtained by calcining at 600 °C for 5 h in an atmosphere with a Mo loading of 2.5 wt.%.

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Abstract

The invention discloses a method for preparing p-hydroxycinnamate by catalyzing lignin alcoholysis through enzymatic hydrolysis lignin-based hierarchical porous carbon loaded molybdenum oxide, which comprises the following steps of: reacting lignin serving as a raw material, the enzymatic hydrolysis lignin-based hierarchical porous carbon loaded molybdenum oxide serving as a catalyst and small organic molecular alcohol serving as a reaction medium in an inert atmosphere at the temperature of 160-220 DEG C for 2-8 hours to obtain p-hydroxycinnamate. Selective conversion of lignin is realized to obtain p-hydroxycinnamate; the total yield of the monophenol compound is 13.37-17.66 wt.%, the yield of the ethyl p-hydroxycinnamate is 8.74-12.92 wt.%, the selectivity is 63.85-74.93%, the selectivity is good, the comprehensive performance is excellent, the safety is good, lignin is used as a carrier and an enzymolysis object, and the utilization amount of the lignin is large.

Description

technical field [0001] The invention relates to high-value utilization of lignin, in particular to a study on the preparation of p-hydroxycinnamate by enzymatic hydrolysis of lignin-based hierarchical porous carbon-supported molybdenum oxide catalyzed by alcoholysis of lignin; it belongs to a high-efficiency resource of renewable biomass field of chemical utilization. Background technique [0002] Lignin is a three-dimensional amorphous polymer based on three different methoxybenzene propylene monomers connected by several specific chemical bonds, mainly composed of C, H, O and other elements. One of the difficulties in the value utilization of lignin is to break the bonds between the units to produce aromatic monomers. [0003] At present, the main route of industrial production of aromatic compounds is based on petroleum. Petroleum as a non-renewable resource has limited reserves, and the use of petroleum will release carbon from deep underground into the atmosphere, cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/00C07C69/732B01J37/08B01J37/02B01J35/10B01J27/24B01J23/28
CPCB01J27/24B01J37/084B01J37/0201B01J23/28C07C67/00B01J35/60C07C69/732
Inventor 李雪辉黄家荣刘思洁龙金星
Owner SOUTH CHINA UNIV OF TECH
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