A kind of mxene base catalyst and its preparation method and application

A technology of catalyst and dispersion liquid, which is applied in the field of MXene-based catalyst and its preparation, and can solve the problems of poor catalyst selectivity, environmental pollution, and difficulty in recycling

Active Publication Date: 2022-05-20
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides an MXene-based catalyst and its preparation method and application. As a catalyst, it has good selectivity for the generation of levoglucosan, and can overcome the poor selectivity of existing catalysts and the corrosion of equipment. , Difficult to recycle, pollute the environment and other issues

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  • A kind of mxene base catalyst and its preparation method and application
  • A kind of mxene base catalyst and its preparation method and application

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preparation example Construction

[0024] The preparation method of described MXene-based catalyst, comprises the following steps:

[0025] Add the graphene oxide dispersion liquid into the MXene dispersion liquid, mix uniformly to obtain the mixed liquid A, and freeze-dry the above mixed liquid A for 20-100 h to obtain the MXene-based catalyst with high selectivity.

[0026] The concentration of the MXene dispersion is 0.5-10mg / mL, the concentration of the graphene oxide dispersion is 0.5-10mg / mL, and the volume ratio of the MXene dispersion and the graphene oxide dispersion is (1-10):1 . The graphene oxide dispersion liquid is an ordinary single-layer graphene oxide dispersion liquid.

[0027] The preparation method of described MXene dispersion liquid comprises the following steps:

[0028] Step 1: Disperse lithium fluoride in hydrochloric acid, and fully stir with a magnetic stirrer at 25-70°C for 1-10min at 200-2400rpm to obtain a mixed solution B; the concentration of the hydrochloric acid is 6-12M, and...

Embodiment 1

[0032] MXene (Ti 3 C 2 T x ) The preparation method of dispersion liquid, comprises the following steps:

[0033] Step 1: Add 40mL of 9M hydrochloric acid into a plastic bottle, then disperse 3.2g of lithium fluoride in hydrochloric acid, and fully stir at room temperature with a magnetic stirrer at a speed of 1000rpm for 5min to obtain a mixed solution B;

[0034] Step 2: Set MAX(Ti 3 AlC 2 ) phase was gradually and slowly added to the mixed solution B, followed by a magnetic stirring reaction at a speed of 1000 rpm at 35°C for 36 hours to obtain a mixed solution C; the volume mass ratio of MAX to the mixed solution B was 2g:40mL;

[0035] Step 3: Centrifuge the precipitate of the mixture C with distilled water repeatedly until the pH of the supernatant is neutral, then dilute the obtained substrate with 100mL of water and ultrasonicate for 30min in a nitrogen ice bath environment with a power of 200W. Finally, the diluted solution was centrifuged at 4,000 r / min for 10 m...

Embodiment 2

[0043] MXene (Ti3 C 2 T x ) The preparation method of dispersion liquid, comprises the following steps:

[0044] Step 1: Add 40mL of 9M hydrochloric acid into a plastic bottle, then disperse 3.2g of lithium fluoride in hydrochloric acid, and fully stir with a magnetic stirrer at a speed of 200rpm at room temperature for 5min to obtain a mixed solution B;

[0045] Step 2: Set MAX(Ti 3 AlC 2 ) phase was gradually and slowly added to the mixed solution B, followed by a magnetic stirring reaction at a speed of 300 rpm at 35°C for 36 hours to obtain a mixed solution C; the volume mass ratio of MAX to the mixed solution B was 2g:40mL;

[0046] Step 3: Centrifuge the centrifuged precipitate of the mixture C with distilled water until its pH is neutral, then dilute the obtained product with 100mL of water and ultrasonicate for 5min in a nitrogen ice bath environment with a power of 1200W, and finally dilute the diluted The resulting solution was centrifuged at 4000 r / min for 10 mi...

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Abstract

The invention provides an MXene-based catalyst and its preparation method and application. The MXene-based catalyst includes MXene and graphene oxide, and the mass ratio of MXene and graphene oxide is (0.5-5):1. Add graphene oxide dispersion liquid into MXene dispersion liquid, mix uniformly to obtain mixed liquid A, and freeze-dry mixed liquid A to obtain MXene-based catalyst. As a catalyst, it has good selectivity for the generation of levoglucosan, and can overcome the existing problems of poor selectivity of the catalyst, corrosion of equipment, difficult recovery, environmental pollution and the like.

Description

technical field [0001] The invention relates to the field of levoglucosan preparation, in particular to an MXene-based catalyst and its preparation method and application. Background technique [0002] Fast pyrolysis technology is one of the important ways of biomass energy utilization, which can quickly and efficiently convert biomass into bio-oil containing a variety of high value-added chemicals. However, the content of biomass components (ie, cellulose, hemicellulose, and lignin) can significantly affect the distribution of chemicals in bio-oil. The introduction of suitable catalysts is an effective measure to increase the yield of target chemicals in bio-oil. Levoglucosan (Levoglucosan, LG, 1,6-anhydro-β-D-glucopyranose) is an important chemical in bio-oil, and has been identified as the most potential "sugar- basedbiorefinery" chemicals. Levoglucosan can be metabolized by microorganisms, therefore, it can be used as an important raw material to produce biodegradable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22B01J27/24B01J35/10B01J21/18C08B37/02
CPCB01J27/22B01J27/24B01J35/1004B01J21/18C08B37/0024C08B37/0003Y02P30/20
Inventor 王俊淇徐芙清王敬枫陈锐王淼樊志敏
Owner XI AN JIAOTONG UNIV
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