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Composite catalyst as well as preparation method and application thereof

A composite catalyst and catalyst technology, applied in the direction of carbon monoxide or formate reaction preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low carbonylation efficiency and difficulties

Active Publication Date: 2020-10-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, methanol is dehydrated on an acid catalyst to generate dimethyl ether and water molecules. Since water molecules can inhibit the carbonylation reaction of methanol, the carbonylation efficiency of methanol on acidic molecular sieves is not high. Therefore, how to effectively avoid the influence of water in the reaction system , it is difficult to improve the carbonylation efficiency of methanol on acid catalysts

Method used

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  • Composite catalyst as well as preparation method and application thereof
  • Composite catalyst as well as preparation method and application thereof
  • Composite catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Weigh 21.46g Zr(NO 3 ) 4 ·5H 2 O, 11.90g Zn(NO 3 ) 2 ·6H 2 O and 7.5g Al(NO 3 ) 3 9H 2 O in a beaker, add 150mL deionized water, stir to obtain salt solution A. Weigh 23.55 g of ammonium carbonate into a beaker, add 150 mL of deionized water, and stir thoroughly to obtain precipitant alkali solution B. Under the condition of vigorous stirring (stirring rate is 450rpm / min), the salt solution A and the precipitant alkali solution B are mixed in a parallel flow mode, and the relative flow rate of the solutions A and B is adjusted to ensure that the pH of the precipitation mixture is kept between 7 and 8 between. After co-precipitation, aging for 2h. Afterwards, it was dried in an oven at 100°C for 6 hours, and then calcined in a muffle furnace at 500°C for 4 hours to obtain a water vapor shift catalyst. According to XRF elemental analysis, the composition of the water vapor shift catalyst is (ZnO) 0.4 (ZrO 2 ) 0.5 (Al 2 o 3 ) 0.1 .

[0113] H-MOR (Si / Al=1...

Embodiment 2

[0119] The same preparation method and preparation conditions as in Example 1 were used to obtain a water vapor shift catalyst. The specific preparation conditions of the modified H-MOR molecular sieve are shown in Table 2 below, and the rest of the operations are the same as in Example 1. The method and conditions for preparing the composite catalyst using the water vapor catalyst and the modified H-MOR molecular sieve are the same as in Example 1.

[0120] Table 2

[0121]

[0122] Catalyst 2#: The difference from Example 1 is that the carrier gas is helium during the pre-adsorption of pyridine by the H-MOR molecular sieve.

[0123] Catalyst 3#: The difference from Example 1 is that the carrier gas is helium during the pre-adsorption of pyridine by the H-MOR molecular sieve.

[0124] 2# and 3# catalysts are evaluated, the reaction conditions are consistent with Example 1, and the reaction evaluation results are shown in Table 3.

[0125] Table 3 embodiment 2 catalyst r...

Embodiment 3

[0129] Co-precipitation method is used to prepare water vapor shift catalysts with different metal compositions and different contents, wherein the composition of water vapor shift catalysts is different from that of Example 1 and Example 3. The rest of the operations and conditions of the coprecipitation method are the same as those of Example 1, and the rest of the operations and conditions of the impregnation method are the same. Condition is the same as embodiment 3. The obtained catalysts are respectively recorded as 5# to 9#, and the specific composition of each catalyst is shown in Table 4. Catalysts 5# to 9# were evaluated under the same reaction conditions as in Example 1, and the reaction products were analyzed online by gas chromatography. The analysis results are shown in Table 4.

[0130] Table 4 embodiment 3 catalyst reaction result

[0131]

[0132] The composition of the water vapor shift catalyst samples was determined by XRF.

[0133] Table 4 shows that ...

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Abstract

The invention discloses a composite catalyst, a preparation method thereof and a method for preparing methyl acetate and acetic acid through methanol carbonylation by using the composite catalyst. Thecomposite catalyst is formed by compounding a water-vapor shift catalyst and a modified H-MOR molecular sieve. The composite catalyst comprises a water vapor shift catalyst and a carbonylation catalyst; the carbonylation catalyst comprises a modified H-MOR molecular sieve; the modified H-MOR molecular sieve is an H-MOR molecular sieve subjected to organic alkali treatment. The composite catalystis used for methanol carbonylation, and the selectivity of methyl acetate exceeds 80%.

Description

technical field [0001] The application relates to a composite catalyst for producing methyl acetate by carbonylation of methanol, its preparation method and its application. Background technique [0002] Methyl acetate is an important chemical, and its downstream products mainly include ethanol, acetic acid, acetic anhydride, methyl acrylate, vinyl acetate and acetamide, etc. It is widely used in the fields of energy and chemical industry. The traditional preparation route of methyl acetate is to first generate acetic acid by carbonylation of methanol, and then esterify acetic acid to generate methyl acetate. At the present stage, Rh-I or Ir-I is mainly used as a catalyst to produce methyl acetate in the process of methanol carbonylation. This reaction system has disadvantages such as expensive catalyst, strong corrosiveness of the reaction system, and iodine-containing reaction product. Using acidic molecular sieves as carbonylation catalysts can effectively solve the abov...

Claims

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Application Information

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IPC IPC(8): B01J29/18B01J29/26C07C67/36C07C69/14
CPCB01J29/185B01J29/18B01J23/06B01J23/10B01J23/26B01J29/26C07C67/36B01J2229/38B01J35/19C07C69/14
Inventor 刘世平刘中民朱文良刘红超刘勇倪友明马现刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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