Method for preparing monophenolic chemicals by depolymerization of lignin catalyzed by metal-organic framework material derivatives loaded with ruthenium

A metal-organic framework and derivative technology, applied in the preparation of organic compounds, organic chemistry, chemical instruments and methods, etc., to achieve the effects of simple process conditions, excellent cycle performance, and low coke rate

Active Publication Date: 2022-06-14
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process conditions of this technology need to reach 300°C to achieve the best yield conditions, and under the process conditions of 300°C, the coking phenomenon that will occur during the lignin conversion process is more obvious, making the catalyst easy to poison and deactivate. Catalyst performance drops significantly after five cycles

Method used

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  • Method for preparing monophenolic chemicals by depolymerization of lignin catalyzed by metal-organic framework material derivatives loaded with ruthenium
  • Method for preparing monophenolic chemicals by depolymerization of lignin catalyzed by metal-organic framework material derivatives loaded with ruthenium
  • Method for preparing monophenolic chemicals by depolymerization of lignin catalyzed by metal-organic framework material derivatives loaded with ruthenium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Zirconium-based metal-organic framework derivatives supported ruthenium-based metal catalysts through a two-step process:

[0036] (1) ZrO 2 Preparation of @C carrier: Weigh 1.16g of ZrCl with a purity of 99.9% 4 Solid, 0.83g of PTA (terephthalic acid) solid with a purity of 99%, the two were added to 250mL of a DMF solution with a purity of 99.5%, and 25mL of acetic acid with a purity of 99.5% was added. The prepared reaction liquid system was ultrasonicated for 30 min, transferred to a reaction vessel, and reacted at 120° C. for 24 h. After the reaction was completed, the reaction system was cooled to room temperature and centrifuged to obtain a white solid. The obtained white solid was washed several times with DMF, ethanol, and deionized water respectively, dried overnight in a vacuum oven, and ground to obtain a white powder, which is the carrier precursor. Transfer the white powder to a tube furnace and calcinate at 550°C for 4 hours under the protection of an ...

Embodiment 2

[0040] Zirconium-based metal-organic framework derivatives supported ruthenium-based metal catalysts through a two-step process:

[0041] (1) ZrO 2 Preparation of @C carrier: Weigh 1.16g of ZrCl with a purity of 99.9% 4 Solid, 0.83g of PTA solid with a purity of 99%, the two were added to 250mL of a DMF solution with a purity of 99.5%, and 25mL of acetic acid with a purity of 99.5% was added. The prepared reaction liquid system was ultrasonicated for 30 min, transferred to a reaction vessel, and reacted at 120° C. for 24 h. After the reaction was completed, the reaction system was cooled to room temperature and centrifuged to obtain a white solid. The obtained white solid was washed several times with DMF, ethanol, and deionized water respectively, dried overnight in a vacuum oven, and ground to obtain a white powder, which is the carrier precursor. Transfer the white powder to a tube furnace and calcinate at 550°C for 4 hours under the protection of an inert gas to obtain ...

Embodiment 3

[0044] Zirconium-based metal-organic framework derivatives supported ruthenium-based metal catalysts through a two-step process:

[0045] (1) ZrO 2 Preparation of @C carrier: Weigh 1.16g of ZrCl with a purity of 99.9% 4 Solid, 0.83g of PTA solid with a purity of 99%, the two were added to 250mL of a DMF solution with a purity of 99.5%, and 25mL of acetic acid with a purity of 99.5% was added. The prepared reaction liquid system was ultrasonicated for 30 min, transferred to a reaction vessel, and reacted at 120° C. for 24 h. After the reaction was completed, the reaction system was cooled to room temperature and centrifuged to obtain a white solid. The obtained white solid was washed several times with DMF, ethanol, and deionized water respectively, dried overnight in a vacuum oven, and ground to obtain a white powder, which is the carrier precursor. Transfer the white powder to a tube furnace and calcinate at 550°C for 4 hours under the protection of an inert gas to obtain ...

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Abstract

The invention discloses a method for preparing monophenolic chemicals by loading ruthenium on metal organic framework material derivatives to catalyze lignin depolymerization. The method uses lignin as a raw material and small organic molecule alcohol as a reaction medium, and realizes the selective transformation of lignin by adjusting the metal ruthenium loading of the catalyst and the conditions of the catalytic system, while suppressing the formation of coke as a by-product. When the loading amount of ruthenium is 0.5wt.%~5wt.%, H 2 Under the conditions of pressure of 1-5MPa, reaction time of 230-290°C, and reaction time of 2-12 hours, the conversion rate of lignin can reach up to 80.20%, and the yield of monophenolic products can reach up to 14.45wt.%. The lowest yield is only 0.8wt.%, the highest yield of 4-ethylphenol reaches 5.56wt.%, and the highest selectivity can reach 41.72%. After the catalyst of the present invention is repeated 10 times, there is no obvious decrease in activity.

Description

technical field [0001] The invention relates to biomass degradation, in particular to a method for preparing monophenolic chemicals by catalyzing lignin conversion with metal-organic framework material derivatives loaded with ruthenium; it belongs to the field of high-value utilization of renewable biomass. technical background [0002] Energy is the foundation and support for national prosperity and sustainable economic development. In order to achieve a further breakthrough in scientific and technological civilization, the energy problem has become a key problem that people have to face and solve. In the entire energy system, biomass, as the only renewable carbon resource in nature, occupies an important position. [0003] In biomass, lignin is a complex polymer compound mainly present in the woody part of plants, and together with cellulose (40%-50%) and hemicellulose (20%-30%), it constitutes the three components of woody biomass. large components. Hemicellulose and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J37/08B01J37/16B01J37/02C07C37/54C07C39/04C07C39/06C07C39/07C07C39/10C07C41/18C07C43/23C07C51/377C07C59/52C07C59/64C07C67/317C07C69/732C07C69/734C07C45/51C07C49/84
CPCB01J23/462B01J37/086B01J37/16B01J37/0201C07C37/004C07C41/18C07C51/377C07C67/333C07C45/51C07C39/04C07C39/06C07C39/07C07C39/10C07C43/23C07C59/52C07C59/64C07C69/732C07C69/734C07C49/84Y02P20/52
Inventor 李雪辉郑歆来龙金星吕凯奇
Owner SOUTH CHINA UNIV OF TECH
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