A photothermal catalytic hydrogenation catalyst and its preparation and application in the selective hydrogenation of p-benzoquinone

A technology of hydrogenation catalyst and photothermal catalysis, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., which can solve the problems of difficult recycling, living environment and human health Hazards, the use of iron powder and other problems, to achieve the effect of fast hydrogenation reaction rate, elimination of mass transfer effects, and long life

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In iron powder reduction, p-benzoquinone is reduced to hydroquinone with iron powder in the presence of hydrochloric acid. This process was once adopted by most manufacturers due to its mature technology, good product purity and high yield. However, This method will produce a large amount of iron powder and is difficult to recycle, causing great harm to the living environment and human health; the catalytic hydrogenation reduction method is to prepare hydroquinone by catalytic hydrogenation of p-benzoquinone under the condition of a noble metal catalyst , the method is environmentally friendly and has low production cost, but there is still a lot of room for optimization in the selectivity of the reaction

Method used

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  • A photothermal catalytic hydrogenation catalyst and its preparation and application in the selective hydrogenation of p-benzoquinone
  • A photothermal catalytic hydrogenation catalyst and its preparation and application in the selective hydrogenation of p-benzoquinone
  • A photothermal catalytic hydrogenation catalyst and its preparation and application in the selective hydrogenation of p-benzoquinone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Measure 1ml of ammonia water with a mass concentration of 23%, 32ml of ethanol and 80ml of deionized water and mix them thoroughly, then add 3.5g of 3-aminophenol, stir until completely dissolved, then drop in 5ml of formaldehyde solution with a mass concentration of 35%, and leave at room temperature After stirring at low temperature for 4 hours, it was transferred to a hydrothermal reaction kettle for hydrothermal reaction at 200°C for 24 hours. After cooling to room temperature, it was placed in an oven and dried at 60°C for 24 hours to obtain polymer microspheres.

[0045] Weigh 1g of polymer microspheres and 15ml of deionized water and stir evenly, then put the prepared mixed slurry into a microwave digestion apparatus, set the temperature at 225°C, and microwave reaction time for 35 minutes, carry out microwave reaction, and take out the mixed slurry after cooling down Put the slurry into a vacuum oven, and dry at 60° C. for 24 hours at a relative vacuum degree of ...

Embodiment 2

[0050] Measure 1ml of ammonia water with a mass concentration of 20%, 20ml of ethanol and 70ml of deionized water and mix them thoroughly, then add 2g of 3-aminophenol, stir until completely dissolved, and then drop in 2ml of formaldehyde solution with a mass concentration of 33%. After stirring for 2 hours, it was transferred to a hydrothermal reaction kettle for hydrothermal reaction at 100°C for 12 hours. After cooling to room temperature, it was put into an oven and dried at 20°C for 12 hours.

[0051] Weigh 1g of polymer microspheres and 15ml of deionized water and stir evenly, then put the prepared mixed slurry into a microwave digestion apparatus, set the temperature at 225°C, and microwave reaction time for 35 minutes, carry out microwave reaction, and take out the mixed slurry after cooling down Put the slurry into a vacuum oven, and dry at 60° C. for 24 hours at a relative vacuum degree of -0.099 to -0.05 MPa to obtain a solid powder.

[0052] After mixing 1g of the ...

Embodiment 3

[0056] Measure 1ml of ammonia water with a mass concentration of 25%, 60ml of ethanol and 100ml of deionized water and mix them thoroughly, then add 5g of 3-aminophenol, stir until completely dissolved, and then drop in 8ml of formaldehyde solution with a mass concentration of 38%. After stirring for 10 hours, it was transferred to a hydrothermal reaction kettle for hydrothermal reaction at 300° C. for 48 hours. After cooling to room temperature, it was put into an oven and dried at 80° C. for 48 hours.

[0057] Weigh 1g of polymer microspheres and 15ml of deionized water and stir evenly, then put the prepared mixed slurry into a microwave digestion apparatus, set the temperature at 225°C, and microwave reaction time for 35 minutes, carry out microwave reaction, and take out the mixed slurry after cooling down Put the slurry into a vacuum oven, and dry at 60° C. for 24 hours at a relative vacuum degree of -0.099 to -0.05 MPa to obtain a solid powder.

[0058] After mixing 1g o...

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Abstract

The invention discloses a photothermal catalytic hydrogenation catalyst and its preparation and application in the selective hydrogenation reaction of p-benzoquinone. The photothermal catalytic hydrogenation catalyst is composed of mesoporous carbon microsphere carrier and carbon quantum dots and metal quantum dots supported on the surface of the carrier. Between ~9.5nm, the metal quantum dot is a combination of one or two of palladium quantum dots and platinum quantum dots, and the particle size range of the metal quantum dots is between 10 and 15nm; in the catalyst, carbon quantum dots The mass fractions of dots and metal quantum dots are 10-30% and 1-2% respectively. The invention provides the application of the photothermal catalytic hydrogenation catalyst in the reaction of selective catalytic hydrogenation of p-benzoquinone to synthesize hydroquinone under the irradiation of 350-400nm ultraviolet light, which has high conversion rate, good selectivity, The hydrogenation reaction rate is fast and the stability is good.

Description

[0001] (1) Technical field [0002] The invention relates to a photothermal catalytic hydrogenation catalyst and its preparation and application, in particular to the application of the catalyst in photothermal catalytic p-benzoquinone selective hydrogenation reaction. [0003] (2) Technical background [0004] Hydroquinone is an important chemical raw material, which is widely used in polymer, pesticide, dyestuff, petrochemical and other industries. Nowadays, hydroquinone is mainly used in the following aspects: (1) Inhibitors for polymer monomers, such as acrylic acid, acrylonitrile, etc.; (2) Antioxidants, such as antioxidants for rubber and plastics, paint varnishes (3) Synthetic raw material of tertiary butyl hydroquinone; (4) Others such as black and white developer, catalyst for syngas desulfurization process, etc. In recent years, as the scope of application of hydroquinone in the field of fine chemicals has gradually expanded, its demand has shown a steady growth tren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J37/34B01J37/02B01J37/08B82Y30/00B82Y40/00C07C37/07C07C39/08
CPCB01J23/44B01J35/004B01J37/0201B01J37/08B01J37/346B82Y30/00B82Y40/00C07C37/07C07C39/08
Inventor 卢春山王昊朱倩文张雪洁季豪克周烨彬李小年
Owner ZHEJIANG UNIV OF TECH
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