Preparation of bimetallic catalyst and its application in catalytic depolymerization of lignin C-C bond

A bimetallic catalyst, lignin technology, applied in catalyst activation/preparation, preparation of organic compounds, molecular sieve catalysts, etc., can solve the problems of single product selectivity to be improved, low aromatic compound selectivity, etc.

Active Publication Date: 2022-03-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Recently, Professor Wang Yanqin started from real lignin and used Ru / NbOPO 4 As a catalyst, it catalyzes the depolymerization of C-O bonds and C-C bonds in lignin structural units to obtain a mixture of aromatic compounds and alkanes, but the selectivity for a single product needs to be improved (Chem.2019, 6, 1521-1536)
Most of the above works are limited to homogeneous catalysts, and relatively low selectivities for aromatic compounds are obtained

Method used

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  • Preparation of bimetallic catalyst and its application in catalytic depolymerization of lignin C-C bond
  • Preparation of bimetallic catalyst and its application in catalytic depolymerization of lignin C-C bond
  • Preparation of bimetallic catalyst and its application in catalytic depolymerization of lignin C-C bond

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Bimetallic Catalyst Ru-ReO x Preparation of / H-Beta (2wt%Ru, 1wt%Re):

[0037] (1) Dry H-Beta at a high temperature of 500°C for 3 hours;

[0038] (2) Dissolve 30.4 mg of ammonium perrhenate in ultrapure water to obtain 0.8 g of ammonium perrhenate solution, place the dried 1 g of H-Beta in the ammonium perrhenate solution, and stir evenly to obtain a solid-liquid mixture A -1;

[0039] (3) The solid-liquid mixture A-1 was left to stand at 25°C for 5 hours, then dried at 60°C for 8 hours, and finally dried at 110°C for 8 hours, and ground to obtain solid A'-1;

[0040] (4) 52.6mg RuCl 3 ·3H 2 O was dissolved in 747 mg ultrapure water to give 0.8 g RuCl 3 solution, the solid A'-1 obtained in (3) was placed in RuCl 3 In the solution, stir evenly to obtain a solid-liquid mixture B-1;

[0041] (5) The solid-liquid mixture B-1 was left to stand at 25°C for 5 hours, then dried at 60°C for 8 hours, and finally dried at 120°C for 8 hours to obtain solid B'-1;

[0042] (...

Embodiment 2

[0044] Bimetallic Catalyst Ru-ReO x Preparation of / H-Beta, x=4-7 (3wt%Ru, 3wt%Re):

[0045] (1) Dry H-Beta at a high temperature of 600°C for 5 hours;

[0046] (2) Dissolve 45.6 mg of ammonium perrhenate in ultrapure water to obtain 0.8 g of ammonium perrhenate solution, place the dried 1 g of H-Beta in the ammonium perrhenate solution, and stir evenly to obtain a solid-liquid mixture A -2;

[0047] (3) The solid-liquid mixture A-2 was placed at 23°C for 5.5 hours, then dried at 70°C for 8 hours, and finally dried at 120°C for 8 hours, and ground to obtain solid A'-2;

[0048] (4) 79.5mg RuCl 3 ·3H 2 O was dissolved in 720.5 mg ultrapure water to give 0.8 g RuCl 3 solution, the solid A'-2 obtained in (3) was placed in RuCl 3 solution, stir evenly to obtain solid-liquid mixture B-2;

[0049] (5) Dry the solid-liquid mixture B-2 at 23°C for 5.5h, then at 70°C for 9h, and finally at 120°C for 9h to obtain solid B'-2;

[0050] (6) Grind the solid B'-2 evenly, place it in ...

Embodiment 3

[0052] Bimetallic Catalyst Ru-ReO x Preparation of / H-Beta, x=4-7 (5wt%Ru, 2wt%Re):

[0053] (1) Dry H-Beta at a high temperature of 550°C for 4 hours;

[0054] (2) Dissolve 30.4 mg of ammonium perrhenate in ultrapure water to obtain 0.8 g of ammonium perrhenate solution, place the dried 1 g of H-Beta in the ammonium perrhenate solution, and stir evenly to obtain a solid-liquid mixture A -3;

[0055] (3) Place the solid-liquid mixture A-3 at 20°C for 6h, then dry at 80°C for 10h, and finally dry at 120°C for 10h, and grind to obtain solid A'-3;

[0056] (4) 131.5mg RuCl 3 ·3H 2 O was dissolved in 668.5 ultrapure water to obtain 0.8 g RuCl 3 solution, the solid A'-3 obtained in (3) was placed in RuCl 3 solution, stir evenly to obtain solid-liquid mixture B-3;

[0057] (5) Stand the solid-liquid mixture B-3 obtained in (4) at 20°C for 6h, then dry at 80°C for 10h, and finally dry at 120°C for 10h to obtain solid B'-3;

[0058] (6) Grind the solid B'-3 evenly, place it in...

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Abstract

The invention relates to a method for preparing a bimetallic catalyst and applying it to catalyze and depolymerize lignin C-C bonds to prepare aromatic compounds. The catalyst used was prepared in a two-step process from Ru‑ReO x / H-Beta represents, wherein x=4~7. There is an interaction between the two Ru-Re metals in the catalyst, and the synergistic effect between the two active metals in the bimetallic catalyst is used to depolymerize the stubborn C-C bonds in lignin, and the C-C bonds in lignin The conversion rate of bond model compounds reaches 99%, and the yield of products reaches about 70%; the yield of aromatic monomers from catalytic cracking of real lignin reaches 8-22%. The raw material lignin of the invention is the most abundant natural renewable aromatic compound resource in nature, has wide sources, low cost, does not consume fossil resources, and meets the requirements of sustainable development. No inorganic acid or alkali is used in the reaction process, which avoids the production of a large amount of lye in the lignin degradation process, avoids the problem of environmental pollution, and the reaction process is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of catalysts and applications, in particular to bimetallic Ru-ReO x / H-Beta catalyst and its preparation method and its application in depolymerizing C-C bonds in lignin to prepare aromatic compounds. Background technique [0002] Biomass is environmentally friendly and renewable, and can achieve CO 2 It is the world's largest and only energy material that can be converted into liquid hydrocarbons. The preparation of liquid fuels and chemicals from biomass is of great significance for solving the shortage of fossil resources and uneven regional distribution, reducing environmental pollution, and achieving sustainable economic development. [0003] Lignin is an important part of biomass resources, accounting for 15-30% of plant dry weight, and is the only renewable carbon resource that can provide aromatic chemicals in nature (Chem. Rev. 2015, 115, 11559-11624; EnergyEnviron. Sci. 2012, 5, 6383-6390.). At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/78B01J37/02C07C41/18C07C43/23C07C37/52C07C39/07C07C39/04C07C39/08C07C1/20C07C15/04C07C4/18C07C15/06C07C15/073C07C45/67C07C49/825
CPCB01J29/7815B01J37/0201C07C41/18C07C37/52C07C1/20C07C4/18C07C45/673B01J2229/18C07C43/23C07C39/07C07C39/04C07C39/08C07C15/04C07C15/06C07C15/073C07C49/825Y02P20/52
Inventor 张波李昌志王爱琴张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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