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Catalyst for preparing dimethyl carbonate and preparation method of catalyst

A technology of dimethyl carbonate and catalyst, which is applied in the field of research and development of new catalysts and the field of dimethyl carbonate production, which can solve the problems of low catalyst activity and achieve the effects of improving stability, increasing activity and inhibiting agglomeration

Active Publication Date: 2017-02-22
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that the activity of the catalyst in the chlorine-free system is not high, and provides a catalyst for synthesizing dimethyl carbonate from CO and methyl nitrite and a preparation method thereof

Method used

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  • Catalyst for preparing dimethyl carbonate and preparation method of catalyst
  • Catalyst for preparing dimethyl carbonate and preparation method of catalyst
  • Catalyst for preparing dimethyl carbonate and preparation method of catalyst

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Experimental program
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Effect test

Embodiment 1

[0023] A. Add 0.25g Pd(NO 3 ) 2 2H 2 O and 0.38g Cu(NO 3 ) 2 ·3H 2 O, after dissolving in water respectively, mix and dilute with water to 100ml, use ammonia water and dilute nitric acid to adjust the pH to 10. Slowly pour the solution into a round bottom flask containing 10g of alkali-treated NaY molecular sieve, 30℃ magnetic force Stir for 4 hours to fully exchange the metal cations in the main active component precursor and co-active component precursor with the cations in the carrier.

[0024] B. Then weigh 1g of PVP and add it to the mixture, raise the temperature to 60°C, and continue to stir for 4h. Suction filtration, fully washed with 500ml of distilled water, and dried at 120°C for 6 hours to obtain the catalyst.

Embodiment 2

[0026] A. Add 0.25g Pd(NO 3 ) 2 2H 2 O, 0.38g Cu(NO 3 ) 2 ·3H 2 O and 0.5 g KNO 3 , respectively dissolved in water, mixed and diluted with water to 100ml, using ammonia and dilute nitric acid to adjust the pH to 10. Slowly pour the solution into a round-bottomed flask containing 10g of alkali-treated NaY molecular sieve, and stir magnetically at 30°C 4h, the metal cations in the main active component precursor and the co-active component precursor are fully exchanged with the cations in the carrier.

[0027] B. Then weigh 2g of PVP and add it to the mixture, raise the temperature to 60°C, and continue to stir for 4h. Suction filtration, fully washed with 500ml of distilled water, and dried at 200°C for 6 hours to obtain the catalyst.

Embodiment 3

[0029] A. Add 0.25g Pd(NO 3 ) 2 2H 2 O and 0.57g Cu(NO 3 ) 2 ·3H 2 O, and 1g KNO 3 , respectively dissolved in water, mixed and diluted with water to 100ml, adjusted to pH 10 with ammonia water and dilute nitric acid.

[0030] B. Weigh 1g of PVP and add it into the mixture, stir at room temperature for 2h until the organic ligands are completely dissolved. Slowly pour the solution into a round-bottomed flask equipped with 10 g of alkali-treated NaY molecular sieves, stir magnetically at 30°C for 5 hours, and make the metal cations in the main active component precursor and the auxiliary active component precursor and the carrier The cations were fully exchanged, the temperature was raised to 70°C, and stirring was continued for 5h. Suction filtration, fully washed with 1000ml of distilled water, and dried at 160°C for 6 hours to obtain the catalyst.

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Abstract

The invention discloses a catalyst for synthesizing dimethyl carbonate through methyl nitrite carbonylation and a preparation method of the catalyst. A main active component of the catalyst is palladium, auxiliary active components of the catalyst are Cu, K and organic ligand, carriers of the catalyst are NaY, NaX and Nabeta type molecular sieves, and the catalyst belongs to chloride-free system catalysts. The catalyst has the advantages that the organic ligand is introduced, the active components and the organic ligand can be properly combined by optimizing preparation conditions, on the one hand, the electron cloud density of the main active component Pd can be increased, activation of CO is promoted, and therefore the activity of the catalyst is improved; on the other hand, due to the existence of the organic ligand, migration and agglomeration of the active components in the reaction process can be effectively inhibited, and the stability of the catalyst can be improved.

Description

technical field [0001] The invention belongs to the field of novel catalyst research and development and the technical field of dimethyl carbonate production, and in particular relates to a catalyst for gas-phase synthesis of dimethyl carbonate from CO and methyl nitrite and a preparation method thereof. Background technique [0002] Dimethyl carbonate (Dimethyl carbonate) referred to as DMC, molecular formula C 3 h 6 o 3 , The relative molecular weight is 90.08, the melting point is 0.5°C, the boiling point is 90.3°C, the flash point is 21.7°C, the density is 1.07g / mL, the viscosity is 0.664MPA·S, and the refractive index is 1.3697 (20°C). It is a colorless transparent liquid at normal temperature and pressure, with a slight fragrance, hardly soluble in water, and miscible with organic solvents such as alcohols and esters in any proportion. Dimethyl carbonate is a kind of "green" chemical with non-toxicity, excellent environmental protection performance and great develop...

Claims

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Application Information

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IPC IPC(8): B01J31/28C07C68/00C07C69/96
CPCB01J31/28B01J2231/00C07C68/00C07C69/96
Inventor 姚元根郭榕覃业燕陈建珊潘鹏斌周张锋林凌
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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