Sulfonated carbonaceous solid acid catalyst as well as preparation method and application thereof

A solid acid catalyst and sulfonated carbonaceous technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, applications, etc., can solve the problems of reduced selectivity and yield reduction of reducing sugars such as glucose, and avoid waste gas The effect of generating acidic waste liquid, optimizing acidity and reducing energy consumption

Inactive Publication Date: 2018-07-13
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, most sulfonated carbonaceous solid acids emphasize the amount of acid on the surface of the catalyst, but the increase in acid amount does not necessarily promote the hydrolysis of lignocellulosic biomass. Easy to further decompose, resulting in reduced selectivity of reducing sugars such as glucose and reduced yield

Method used

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  • Sulfonated carbonaceous solid acid catalyst as well as preparation method and application thereof
  • Sulfonated carbonaceous solid acid catalyst as well as preparation method and application thereof
  • Sulfonated carbonaceous solid acid catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation Embodiment 1

[0051] Glucose and p-toluenesulfonic acid with a mass ratio of 4:1 were thoroughly mixed in a 100mL polytetrafluoroethylene-lined self-pressurized stainless steel hydrothermal kettle, and then the hydrothermal kettle was sealed and placed in an oven at 180°C Hydrothermal carbonization for 24h. The obtained black blocky solid was placed in a beaker and continued to be heat-treated in an oven at 180° C. for 24 h to remove small molecular polymers attached to the surface of the catalyst. After cooling, grind the obtained black blocky solid, wash it with absolute ethanol and deionized water higher than 80°C until the washing liquid is neutral, collect the black powder and dry it in an oven at 120°C for 6 hours to prepare sulfonated carbon quality solid acid. The densities of sulfonic acid groups and oxygen-containing groups on the surface of the catalyst were 0.15 and 2.78 mmol / g, respectively.

preparation Embodiment 2

[0053] Mix glucose and p-toluenesulfonic acid with a mass ratio of 4:2 in a 100mL polytetrafluoroethylene-lined self-pressurized stainless steel hydrothermal kettle, then seal the hydrothermal kettle and place it in an oven at 180°C Hydrothermal carbonization for 24h. The obtained black blocky solid was placed in a beaker and continued to be heat-treated in an oven at 180° C. for 24 h to remove small molecular polymers attached to the surface of the catalyst. After cooling, grind the obtained black blocky solid, wash it with absolute ethanol and deionized water higher than 80°C until the washing liquid is neutral, collect the black powder and dry it in an oven at 120°C for 6 hours to prepare sulfonated carbon quality solid acid. The densities of sulfonic acid groups and oxygen-containing groups on the surface of the catalyst were 0.40 and 1.93 mmol / g, respectively.

[0054] figure 1 For the XRD spectrogram of the obtained sulfonated carbonaceous solid acid catalyst; figur...

preparation Embodiment 3

[0056] Glucose, p-toluenesulfonic acid and benzyl chloride with a mass ratio of 4:4 were fully mixed in a 100mL Teflon-lined self-pressurized stainless steel hydrothermal kettle, and then the hydrothermal kettle was sealed and placed in Hydrothermal carbonization in an oven at 180°C for 24h. The obtained black blocky solid was placed in a beaker and continued to be heat-treated in an oven at 180° C. for 24 h to remove small molecular polymers attached to the surface of the catalyst. After cooling, grind the obtained black blocky solid, wash it with absolute ethanol and deionized water higher than 80°C until the washing liquid is neutral, collect the black powder and dry it in an oven at 120°C for 6 hours to prepare sulfonated carbon quality solid acid. The densities of sulfonic acid groups and oxygen-containing groups on the catalyst surface were 0.56 and 1.42 mmol / g, respectively.

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Abstract

The invention discloses a sulfonated carbonaceous solid acid catalyst as well as a preparation method and application thereof to a microcrystalline cellulose hydrolysis process. The density of a sulfonic acid group on the surface of the catalyst is 0.30 to 0.80mmol / g and the density of an oxygen-containing group is 1.00 to 2.50mmol / g; the density ratio of the sulfonic acid group to the oxygen-containing group is controlled to be from (1 to 1.25) to (1 to 8.33). The catalyst has high hydrolysis efficiency and a preparation technology is simple and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of solid acid catalysts, and in particular relates to a preparation method of a sulfonated carbonaceous solid acid catalyst and its application in the hydrolysis process of microcrystalline cellulose. Background technique [0002] Hydrolysis of lignocellulosic biomass to produce reducing sugars is an important step in its catalytic conversion to produce biofuels and chemicals. After hydrolyzing lignocellulosic biomass to produce reducing sugars, ethanol, butanol, 1,4-butanedioic acid, formic acid, furfural, 5-hydroxymethylfurfural, and acetylpropane can be further prepared by biological fermentation or chemical conversion Acid and other biofuels, petroleum-based platform compounds and chemicals, thereby greatly reducing the dependence on fossil energy, and bringing great opportunities to adjust the energy structure of primary consumption and alleviate the environmental crisis. [0003] Cellulase is an ideal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/053B01J27/06C13K1/02
CPCB01J27/053B01J27/06C13K1/02
Inventor 牟新东陈公哲王喜成刘秀云姜义军
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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