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Preparation method and application of a supported copper-based catalyst with enhanced surface acidity

A copper-based catalyst, supported technology, used in catalyst activation/preparation, heterocyclic compound preparation, chemical instruments and methods, etc. Catalytic performance and stability, enhanced strong interaction, simple and green process

Active Publication Date: 2021-01-12
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a preparation method and application of a supported copper-based catalyst with enhanced surface acidity, which solves the problems that the traditional supported copper-based nano-catalysts are easy to agglomerate, have large particles, small interaction between metal Cu and the carrier, and difficult surface acid sites. control, poor stability and low reuse rate, and apply it to the reaction of efficient selective hydrogenation rearrangement of furfural to prepare cyclopentanone

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  • Preparation method and application of a supported copper-based catalyst with enhanced surface acidity
  • Preparation method and application of a supported copper-based catalyst with enhanced surface acidity
  • Preparation method and application of a supported copper-based catalyst with enhanced surface acidity

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Effect test

Embodiment 1

[0027] Weigh 3.86g zirconium nitrate Zr (NO 3 ) 4 ·5H 2 O, 0.18g ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2.03g copper nitrate Cu(NO 3 ) 2 ·3H 2 O, 0.30g of potassium chloride KCl, dissolved in 100ml of deionized water to prepare a salt solution. Weigh 4.75g sodium carbonate Na 2 CO 3 Dissolve in 100ml deionized water to prepare alkaline solution. Put the salt solution and alkali solution prepared above in a fully back-mixed rotary liquid film reactor at the same time, fully stir at a speed of 4000rpm for 4min, hydrothermally crystallize the obtained suspension at 70°C for 48h, and deionize the obtained precipitate Wash with water until the supernatant is neutral, then dry at 70°C for 12h. The obtained solid was roasted in a muffle furnace at a heating rate of 5 °C min -1, the temperature was raised from room temperature to 500° C., and then kept at constant temperature for 6 hours, and then calcined to obtain the catalyst precursor. with 10%H 2 / N 2 The...

Embodiment 2

[0031] Weigh 3.86g zirconium nitrate Zr (NO 3 ) 4 ·5H 2 O, 0.18g ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O, 3.14g copper nitrate Cu(NO 3 ) 2 ·3H 2 O, 0.30g of potassium chloride KCl, dissolved in 100ml of deionized water to prepare a salt solution. Take by weighing 5.73g sodium carbonate solution Na 2 CO 3 Prepare an alkaline solution in 100ml deionized water. Put the salt solution and alkali solution prepared above in a fully back-mixed rotary liquid film reactor at the same time, fully stir at a speed of 4000rpm for 4min, hydrothermally crystallize the obtained suspension at 70°C for 60h, and deionize the obtained precipitate Wash with water until the supernatant is neutral, then dry at 70°C for 12h. The obtained solid was roasted in a muffle furnace at a heating rate of 5 °C min -1 , the temperature was raised from room temperature to 450° C., and then kept at constant temperature for 5 hours, and then calcined to obtain the catalyst precursor. with 10%H ...

Embodiment 3

[0034] Weigh 3.86g zirconium nitrate Zr (NO 3 ) 4 ·5H 2 O, 0.18g ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O, 1.20g copper nitrate Cu(NO 3 ) 2 ·3H 2 O, 0.30g of potassium chloride KCl, dissolved in 100ml of deionized water to prepare a salt solution. Weigh 4.03g sodium carbonate Na 2 CO 3 Dissolve in 100ml deionized water to prepare alkaline solution. Put the salt solution and alkali solution prepared above in the fully back-mixed rotary liquid film reactor at the same time, fully stir at a speed of 5000rpm for 3min, hydrothermally crystallize the obtained suspension at 70°C for 72h, and deionize the obtained precipitate Wash with water until the supernatant is neutral, then dry at 70°C for 12h. The obtained solid was roasted in a muffle furnace at a heating rate of 3 °C min -1 , the temperature was raised from room temperature to 600° C., and then kept at a constant temperature for 5 hours, and then calcined to obtain the catalyst precursor. with 10%H 2 / N ...

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Abstract

The invention provides a preparation method and application of a supported copper-based catalyst with enhanced surface acidity. The present invention synthesizes a catalyst precursor through a simple nucleation / crystallization isolation method combined with the structural control of potassium chloride during the preparation process, and then obtains a supported copper-based catalyst with enhanced surface acidity through roasting and reduction, and applies it to high-efficiency In the reaction of selective hydrogenation and rearrangement of furfural to prepare cyclopentanone, the conversion rate of furfural can reach 95% to 99%, and the selectivity of cyclopentanone can reach 80% to 90%. This supported copper-based nanocatalyst has abundant surface acid sites, good catalytic performance, stable structure, high reusability, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and application of a supported copper-based catalyst with enhanced surface acidity. Background technique [0002] Cyclopentanone is an important organic molecular intermediate, which has important application value in the fields of pesticides, medicines, spices, rubber synthesis, etc. It can also be used to prepare biofuels and fuel additives, and because of its good solubility for organic matter It is also often used as an organic solvent. At present, the main methods for preparing cyclopentanone in industry include pyrolysis of adipic acid and its derivatives and direct oxidation of cyclopentene. However, these two methods all have the disadvantages of insufficient raw material resources, high price, low utilization rate of raw materials, high temperature and pressure required for the reaction, and large environmental pollution by by-products...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/885B01J35/10B01J37/08B01J37/18C07C45/59C07C49/395
CPCC07C45/59B01J23/885B01J37/088B01J37/18C07C2601/08B01J35/393B01J35/615C07C49/395
Inventor 李峰张贻凤范国利杨兰
Owner BEIJING UNIV OF CHEM TECH
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