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Chromium-zinc modified molecular sieve loaded bimetallic catalyst, preparation thereof and application of chromium-zinc modified molecular sieve loaded bimetallic catalyst in lignin depolymerization

A technology of bimetallic catalyst and molecular sieve is applied in the field of lignin depolymerization research to achieve the effects of reducing cost, simple and convenient preparation process, and increasing the degree of depolymerization

Active Publication Date: 2022-05-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on modified molecular sieve-supported bimetallic catalysts for lignin hydrodepolymerization

Method used

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  • Chromium-zinc modified molecular sieve loaded bimetallic catalyst, preparation thereof and application of chromium-zinc modified molecular sieve loaded bimetallic catalyst in lignin depolymerization
  • Chromium-zinc modified molecular sieve loaded bimetallic catalyst, preparation thereof and application of chromium-zinc modified molecular sieve loaded bimetallic catalyst in lignin depolymerization
  • Chromium-zinc modified molecular sieve loaded bimetallic catalyst, preparation thereof and application of chromium-zinc modified molecular sieve loaded bimetallic catalyst in lignin depolymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0039] Weigh 1.46g Cr(NO 3 ) 3 ·9H2 O and 0.87 g Zn(NO 3 ) 3 ·6H 2 O Solid in a beaker, to which 15ml of deionized water was added, and then added 5g of all-silicon MCM-41 carrier, wherein the modified amount of metal chromium and zinc are 3.8wt%, ultrasonic shock 25min, stirring for 10h, 110 °C drying for 8h, roasting at 500 °C in the muffle furnace for 5h, wherein the heating rate is 6 °C / min, that is, the modified molecular sieve carrier (Cr-Zn-MCM-41).

[0040] 0.18g, 0.36g, 0.54g, and 0.72g Fe(NO 3 ) 3 ·9H 2 O and 0.067g, 0.134g, 0.20g, 0.268g CuCl 2 ·2H 2 O, dissolved with 3 ml of deionized water, added 1g modified molecular sieve carrier, ultrasonically shaken for 25min, stirred for 10h, dried at 110 °C for 8h, hydrogen was reduced at 500 °C in a tubular furnace for 4h, wherein the heating rate of hydrogen reduction was 4 °C / min, at N 2 / O 2 Ambient passivation for 30min in a mixed atmosphere, where O 2 The content is 1wt%, N 2 / O 2 The flow rate of the mixture is 40ml / min...

Embodiment 5-7

[0046] Refer to the preparation process of the modified molecular sieve carrier in Example 1-4 to prepare the modified molecular sieve carrier.

[0047] Each is called 0.54g Fe(NO 3 ) 3 ·9H 2 O、0.315g Co(CH 3 COO) 2 ·4H 2 O、0.30g NiCl 2 ·6H 2 O、0.14g(NH 4 ) 6 Mo 7 O 24 ·4H 2 O and four servings of 0.201 g CuCl 2 ·2H 2 O, dissolved with 3ml of deionized water, added 1g modified molecular sieve carrier, ultrasonically shaken for 25min, stirred for 10h, dried at 110 °C for 8h, hydrogen was reduced at 500 °C in a tubular furnace for 4h, wherein the heating rate of hydrogen reduction was 4 °C / min, at N 2 / O 2 Ambient passivation for 30min in a mixed atmosphere, where O 2 The content is 1wt%, N 2 / O 2 The flow rate of the mixture is 40ml / min, and the bimetallic catalyst with a metal Fe, Co, Ni and Mo load of 7.5wt and Cu load of 7.5wt% is obtained, respectively, which is recorded as 7.5X-7.5Cu / Cr-Zn-MCM-41 (X=Fe, Co, Ni, Mo), as shown in Table 2.

[0048] The 0.3 g of lignin obtained by...

Embodiment 8-11

[0053] Referring to Example 6, the 0.3g organic solvent extraction method obtained lignin (obtained using ethanol), 0.15g of 7.5Ni-7.5Cu / Cr-Zn-MCM-41 catalyst and 40ml of solvent (see Table 3) were added to the high-pressure reactor, to which 1MPa N was introduced 2 Replace the air in the kettle, repeat 3 times, exhaust to atmospheric pressure, and fill with 1 MPa H 2 , 280 °C reaction 5h, after the end of the reaction, the reactor with tap water reduced to room temperature, filtering, filter residue with ethyl acetate for washing, and then using methanol volume, take 1ml of extract for gas chromatographic analysis, the yield of the resulting liquid product aromatic alcohols, phenols and other oxygenated aromatic compounds is shown in Table 3.

[0054] Table 3 Effects of different solvents on the depolymerization of organic solvents lignin

[0055]

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PUM

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Abstract

The invention discloses a chromium-zinc modified molecular sieve loaded bimetallic catalyst, preparation thereof and application of the chromium-zinc modified molecular sieve loaded bimetallic catalyst in lignin depolymerization. According to the invention, a chromium-zinc modified all-silicon molecular sieve MCM-41 is used as a carrier and is loaded with an active component copper metal and other transition metals to obtain the chromium-zinc modified molecular sieve loaded bimetallic catalyst. The preparation process of the modified molecular sieve loaded bimetallic catalyst is simple, a depolymerization product can be obtained through catalysis in a reaction system, and the depolymerization reaction of lignin is facilitated through the synergistic effect of bimetallic.

Description

Technical field [0001] The present invention belongs to the field of lignin depolymerization, specifically relates to a chromium-zinc modified molecular sieve-supported bimetallic catalyst and its preparation and application in lignin depolymerization. Background [0002] With the continuous reduction of fossil energy and the intensification of global warming problems, the production of high value-added chemicals has attracted more and more attention from researchers, lignocellulose is inedible and sustainable, is an ideal biomass resource to replace fossil energy, can greatly reduce sulfur dioxide emissions. Lignocellulose is composed of three substances: cellulose, hemicellulose and lignin. Lignin is a three-dimensional amorphous polymer consisting of three different units, namely hydrylacyl phenylpropane (S), guaiacyzyl phenylpropane (G) and p-hydroxyphenylpropane (H), which are connected by different chemical bonds. Lignin contains more hydroxyl structures, which can be conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C07G99/00
CPCB01J29/0341
Inventor 常杰吴佳文付严
Owner SOUTH CHINA UNIV OF TECH
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