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Acid-base double-site catalyst for carbon-carbon coupling reaction and application thereof

A carbon-carbon coupling and catalyst technology, used in molecular sieve catalysts, physical/chemical process catalysts, carbon-based compound preparation, etc., can solve the problem that the performance of acid-base catalysts cannot meet industrial production, and achieve the effect of excellent catalytic activity

Active Publication Date: 2022-01-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, based on the above mechanism, the performance of the above-mentioned acid-base catalyst cannot meet the needs of industrial production.

Method used

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  • Acid-base double-site catalyst for carbon-carbon coupling reaction and application thereof
  • Acid-base double-site catalyst for carbon-carbon coupling reaction and application thereof
  • Acid-base double-site catalyst for carbon-carbon coupling reaction and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Put 2g of H-SAPO-34 molecular sieve into a ball mill with a ball-to-material volume ratio of 5, ball mill for 8 hours, and then disperse in 500mL of 2vol% ethanol aqueous solution to obtain dispersion I; the magnesium and aluminum nitrates are prepared into 1L metal salt Solution, wherein the concentrations of magnesium ions and aluminum ions are 0.15mol / L and 0.05mol / L respectively; configure 1L alkaline solution containing sodium hydroxide and sodium carbonate, wherein the concentrations of sodium hydroxide and sodium carbonate are 0.45mol / L respectively L and 0.15mol / L; add the metal salt solution and the alkali solution into the dispersion liquid Ⅰ in parallel, the dripping speed is 3mL / min, and control the pH=9~10 during the whole process; stand for aging for 10h, wash with water until neutral, pump Filtration; the resulting solid was calcined at 600 ° C for 12h. The obtained product is an acid-base double-site catalyst, wherein the weight ratio of catalyst A to ca...

Embodiment 2

[0141] Put 2.2g of H-B molecular sieve into a ball mill and mill for 6 hours, then disperse in 500mL of 2% ethanol solution to obtain dispersion I; the nitrates of magnesium, aluminum and chromium are prepared into 1L metal salt solution, in which magnesium ions, aluminum ions and The concentrations of chromium ions are 0.2mol / L, 0.05mol / L and 0.03mol / L respectively; 1L of alkaline solution containing sodium hydroxide and sodium carbonate is prepared, and the concentrations of sodium hydroxide and sodium carbonate are respectively 0.3mol / L and 0.1mol / L; add the metal salt solution and the alkali solution into the dispersion C in parallel, drop at a rate of 6mL / min, and control the pH=9 to 10 during the whole process; age, wash to neutral, and suction filter; the obtained solid Calcined at 550°C for 12h. The obtained product is an acid-base double-site catalyst, and the weight ratio of component A to component B is 5.7:1.

[0142] According to the n-butylamine titration test, ...

Embodiment 3

[0147]Put 2.3g of H-Y molecular sieves into a ball mill for 7 hours, and then disperse them in 500mL of 1% ethanol solution to obtain dispersion I; the nitrates of magnesium, aluminum and zinc are prepared into 1L metal salt solution, in which magnesium ions, aluminum ions and The concentration of zinc ions is 0.2mol / L, 0.05mol / L and 0.03mol / L respectively; configure 1L alkaline solution containing sodium hydroxide, urea and sodium carbonate, wherein the concentrations of sodium hydroxide, urea and sodium carbonate are respectively 0.45mol / L, 0.06mol / L and 0.09mol / L; add the metal salt solution and the alkali solution into the dispersion C in parallel, drop at a speed of 5 mL / min, and control the pH=9 to 10 during the whole process; aging, washing with water To neutral, filter with suction; Calcinate the resulting solid at 500°C for 12h. The obtained product is an acid-base double-site catalyst, and the weight ratio of component A to component B is 5.6:1.

[0148] According t...

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Abstract

The invention discloses an acid-base double-site catalyst for a carbon-carbon coupling reaction, the acid-base double-site catalyst is formed by compounding a catalyst A and a catalyst B, the catalyst A is selected from a metal oxide with a surface alkaline site, and the catalyst B is selected from a molecular sieve with a surface acidic site. The acid-base double-site catalyst is suitable for a carbon-carbon coupling reaction of one or more of an alcohol organic compound, an aldehyde organic compound, a ketone organic compound and an ester organic compound, the reaction rate of the carbon-carbon coupling reaction can be greatly improved, and the conversion rate of a substrate and the yield and selectivity of the target product are remarkably improved. The catalyst especially has excellent catalytic activity reaction for co-production of mesityl oxide and isophorone through separate condensation coupling of acetone and self-condensation coupling of cyclohexanone to produce o-cyclohexenyl cyclohexanone, the reaction for preparing methyl methacrylate through condensation coupling of methyl propionate and formaldehyde and the reaction for preparing pentylidene cyclopentanone through condensation coupling of cyclopentanone and n-valeraldehyde.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an acid-base double-site catalyst for carbon-carbon coupling reaction and its application. Background technique [0002] The carbon-carbon coupling reaction catalyzed by solid acid and base can transform cheap small molecular organic compounds into high value-added macromolecular products. For example, the condensation coupling of acetone itself can obtain the important pharmaceutical intermediate isophorone; the self-condensation coupling of cyclohexanone can prepare the important intermediate o-cyclohexenylcyclohexanone; It can be used to prepare the intermediate pentylidene cyclopentanone, which is an important fragrance methyl dihydrojasmonate; another example, formaldehyde and methyl propionate can be condensed and coupled to obtain the organic glass monomer methyl methacrylate. This type of carbon-carbon coupling reaction can be catalyzed by either a homogeneous system o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J29/70B01J29/08B01J29/48C07C45/74C07C49/647C07C49/613C07C67/343C07C69/533
CPCB01J29/85B01J29/70B01J29/088B01J29/48C07C45/74C07C67/343C07C49/647C07C49/613C07C69/533
Inventor 王勇陆冰毛善俊王哲
Owner ZHEJIANG UNIV
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