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A carbon-based solid acid catalyst and its preparation method and its application to biomass hydrothermal conversion

A carbon-based solid acid and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of restricting large-scale industrial applications, reduced catalyst cycle performance, and limited number of active centers , to achieve the effects of facilitating large-scale production, improving catalytic performance, and making the preparation process green and environmentally friendly

Active Publication Date: 2022-01-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, metal catalysts, especially noble metal catalysts, are expensive in raw materials and high in preparation costs, which limit their large-scale industrial application
In addition, the impurities and solid by-products of the reaction raw materials are easy to adhere to the surface of the catalyst, causing the catalyst to be easily deactivated, and the finer powder catalyst is easily lost during the recovery process, resulting in a decrease in the cycle performance of the catalyst. Load, its number of active centers is limited, so its activity is limited

Method used

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  • A carbon-based solid acid catalyst and its preparation method and its application to biomass hydrothermal conversion
  • A carbon-based solid acid catalyst and its preparation method and its application to biomass hydrothermal conversion
  • A carbon-based solid acid catalyst and its preparation method and its application to biomass hydrothermal conversion

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preparation example Construction

[0050] The present invention proposes a method for producing a carbon-based solid acid catalyst, pectin carbon-based precursor, the aromatic ring pectin matrix resin ion in a medium mixing dried, the dried resultant was subjected to pyrolysis, using concentrated sulfuric acid for sulfonation, to give a carbon-based solid acid catalyst. Includes the following steps:

[0051] S1. Pump with water, then activate sulfuric acid, and then adding the mixture into the ionic resin of the aromatic ring matrix;

[0052] S2. Dry the obtained obtained by step S1, the obtained material is pulverized into a powder, and the pyrolysis of the dry inert gas;

[0053] S3. The solid obtained after the heat solution of step S2 is subjected to sulfonation treatment;

[0054] S4. After the obtaining of step S3 is diluted with water, filtered, filtered, washed with water until the sulfate ion is no longer detected in the washing water;

[0055] S5. The solids obtained by filtration were dried.

[0056] Fur...

Embodiment 1

[0071] 8g dried orange peel pectin 30ml deionized water, was added 1ml of concentrated sulfuric acid (98%), and the mixture was slowly added to the pre-dried in 8g Amberlyst 15 ion exchange resin. At 110 ~ 120 ℃ dried 48 h, the resulting black material was dried at 300 deg.] C in a horizontal tube furnace nitrogen pyrolyzed 1 h. With concentrated sulfuric acid (1 g solid / 5g H 2 SO 4 ) Sulfonation at 24 h at 80 ℃, with magnetic stirring heating apparatus is an oil heating bath. After dilution with large amounts of deionized water, the black substance was collected by filtration, washed with deionized water several times, washed with water until sulfate ions are no longer detected. The resulting black solid was dried in an oven to 80 ° C for 24 hours. 0.05g of the resulting black solid was taken in 10ml test tube, was added 0.1g of xylose and 5mlγ- valerolactone, heating the reaction under microwave conditions IH, at a reaction temperature 140 ~ 180 ℃, furfural yields are higher t...

Embodiment 2

[0078] 8g dried orange peel pectin 30ml deionized water, was added 1ml of concentrated sulfuric acid (98%), and the mixture was slowly added to the pre-dried in 8g Amberlyst 15 ion exchange resin. At 110 ~ 120 ℃ dried 48 h, the resulting black material was dried at 300 deg.] C in a horizontal tube furnace nitrogen pyrolyzed 1 h. With concentrated sulfuric acid (1 g solid / 5g H 2 SO 4 ) Sulfonation at 24 h at 100 ℃, with magnetic stirring heating apparatus is an oil heating bath. After dilution with large amounts of deionized water, the black substance was collected by filtration, washed with deionized water several times, washed with water until sulfate ions are no longer detected. The resulting black solid was dried in an oven to 80 ° C for 24 hours. 0.05g of the resulting black solid was taken in 10ml test tube, was added 0.1g of xylose and 5mlγ- valerolactone, heating the reaction under microwave conditions IH, at a reaction temperature of 130 ℃, furfural yield 57.6mol.%.

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Abstract

The present invention proposes a carbon-based solid acid catalyst and its preparation method and its application to biomass hydrothermal conversion, wherein the preparation method of the carbon-based solid acid catalyst comprises the following steps: mixing pectin with water, and then adding Concentrated sulfuric acid is activated, and then the mixture is added to the ion resin of the aromatic ring matrix; the obtained material is dried, the obtained material is pulverized into powder, and pyrolyzed under dry inert gas; the solid obtained after pyrolysis is sulfonated with concentrated sulfuric acid Treatment; the obtained product is diluted with water and then filtered, and the filtered filter residue is washed with water until sulfate ions are no longer detected in the washing water; the filtered solid is dried. The prepared catalyst has distinct particles, is not easy to be lost, and is convenient for recycling. Moreover, the prepared catalyst can simultaneously realize the hydrothermal conversion of five-carbon sugars and six-carbon sugars, and achieve the purpose of preparing high-value platform compounds.

Description

Technical field [0001] The present invention relates to the technical field of the preparation of green energy chemical materials, primarily related to the use of free radicals rich pectin, pectin as precursor in the usual carbon-based solid acid catalyst prepared by adding ion exchange resin matrix reinforced aromatic ring catalytic effect, the the catalyst can be effectively applied to the material prepared by hydrothermal reaction of catalytic depolymerization raw common, in order to achieve the purpose of efficient production of valuable compounds platform. Background technique [0002] Face the problem of global energy shortage and environmental pollution, human environmental awareness and energy conservation awareness gradually strengthened so that pollution problems in the chemical industry has been more and more attention. In response to the national "social green light for heat, the earth also clear water and blue sky" green energy call for more scientific researchers co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/02B01J31/10B01J37/08C07D307/50C07D307/46
CPCB01J27/02B01J31/10B01J37/084C07D307/50C07D307/46C07D307/36B01J27/20B01J37/20B01J35/002B01J21/18Y02P20/584B01J37/0036B01J37/009B01J37/04B01J37/06
Inventor 王树荣熊珊珊徐昊朱玲君李允超
Owner ZHEJIANG UNIV
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