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A kind of hierarchical porous catalyst and its preparation method and application

A catalyst and a technology of hierarchical pores, which are applied in the field of hierarchical porous catalysts and their preparation, can solve the problems that the reaction process is difficult to effectively control, the reaction bed is easy to form hot spots, and the promotion of industrial applications is limited, so as to reduce the COX generation rate and avoid the The effect of deep oxidation and strong thermal conductivity

Active Publication Date: 2022-04-19
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite oxide catalysts and traditional carrier-supported catalysts, such as amorphous SiO 2 、Al 2 o 3 etc., the heat conduction performance is poor, the reaction bed is easy to form hot spots, and the reaction process is difficult to effectively control, which limits its industrial application.

Method used

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  • A kind of hierarchical porous catalyst and its preparation method and application
  • A kind of hierarchical porous catalyst and its preparation method and application
  • A kind of hierarchical porous catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 A hierarchical porous catalyst, the catalyst consists of 23.12g of active components and 53.95g of SiO with three-dimensional ordered hierarchical pores 2 carrier; the active ingredient consists of 17.66g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.25g NH 4 VO 3 , 0.42gCu(CH 3 C00) 2 2H 2 O, 0.48g SbCl 3 , 0.30g H 3 AsO 4 , 1.09g H 3 PO 4 , 0.35g La(CH 3 COO) 3 1.5H 2 O, 0.45g Ce(NO 3 ) 3 ·6H 2 O and 2.12g CsOH·H 2 O composition.

[0028] Among them: SiO 2 The carrier refers to the synthesis of SiO by the method of volatile self-assembly using silicon source, macroporous template agent and mesoporous template agent. 2 Precursor, the precursor is dried at 100-120°C for 12-24h, and then calcined at no lower than 600°C for 4-8h to obtain SiO with a three-dimensional ordered macropore-mesoporous structure 2 . The specific method is as follows:

[0029]①Dissolve 50g of methyl methacrylate (MMA) in 500g of water to obtain an aqueous solution of methyl met...

Embodiment 2

[0038] Example 2 A hierarchical porous catalyst, the catalyst consists of 40.78g of active components and 95.15g of SiO with three-dimensional ordered hierarchical pores 2 carrier; the active ingredient consists of 35.32g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.25g NH 4 VO 3 , 0.42g Cu(CH 3 C00) 2 2H 2 O, 0.48g SbCl 3 , 0.30g H 3 AsO 4 , 1.09g H 3 PO 4 , 0.35g La(CH 3 COO) 3 1.5H 2 O, 0.45g Ce(NO 3 ) 3 ·6H 2 O and 2.12g CsOH·H 2 O composition.

[0039] Among them: SiO 2 The carrier is the same as in Example 1.

[0040] The preparation method of this hierarchical porous catalyst comprises the following steps:

[0041] (1) Weighing according to the proportion;

[0042] ⑵35.32g (NH 4 ) 6 Mo 7 o 24 4H 2 O with 0.25g NH 4 VO 3 Dissolve in 100mL deionized water to obtain soaking solution A; soaking solution B, soaking solution C, soaking solution D, and soaking solution E are the same as in Example 1;

[0043] (3) Using the equal volume impregnation method, imp...

Embodiment 3

[0045] Example 3 A hierarchical porous catalyst, the catalyst is composed of 23.12g of active components and 28.25g of SiO with three-dimensional ordered hierarchical pores 2 carrier; the active ingredient consists of 17.66g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.25g NH 4 VO 3 , 0.42g Cu(CH 3 C00) 2 2H 2 O, 0.48g SbCl 3 , 0.30g H 3 AsO 4 , 1.09g H 3 PO 4 , 0.35g La(CH 3 COO) 3 1.5H 2 O, 0.45g Ce(NO 3 ) 3 ·6H 2 O and 2.12g CsOH·H 2 O composition.

[0046] Among them: SiO 2 The carrier is the same as in Example 1.

[0047] The preparation method of this hierarchical porous catalyst comprises the following steps:

[0048] (1) Weighing according to the proportion;

[0049] ⑵The 17.66g (NH 4 ) 6 Mo 7 o 24 4H 2 O with 0.25g NH 4 VO 3 Dissolve in 50mL deionized water to obtain soaking solution A; soaking solution B, soaking solution C, soaking solution D, and soaking solution E are the same as in Example 1;

[0050] (3) Using the equal volume impregnation metho...

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Abstract

The invention relates to a multi-level porous catalyst, which is composed of active components accounting for 30% to 60% of the total mass and the balance being SiO with three-dimensional ordered multi-level channels. 2 Carrier is made; In parts by weight, the active component consists of 17.66g / 35.32g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 0.25g NH 4 VO 3 , 0.42g Cu(CH 3 C00) 2 2H 2 O, 0.48g SbCl 3 , 0.30g H 3 AsO 4 , 1.09g H 3 PO 4 , 0.35g La(CH 3 COO) 3 1.5H 2 O, 0.45g Ce(NO 3 ) 3 ·6H 2 O and 2.12g CsOH·H 2 O composition. At the same time, the invention also discloses the preparation method and application of the catalyst. The present invention can significantly improve the catalytic activity of the reaction, and it can be used to catalyze the oxidative dehydrogenation of isobutyraldehyde to prepare methacrylic acid, which can be carried out under normal pressure conditions with air as the oxidizing agent, and can obtain higher formazan under lower reaction temperature conditions. Acrylic acid yield and lower CO X generation rate.

Description

technical field [0001] The invention relates to the field of conversion and utilization of isobutyraldehyde, in particular to a multi-level porous catalyst and its preparation method and application. Background technique [0002] Methacrylic acid (MAA) is the basic raw material for the production of methyl methacrylate (MMA) and other higher esters. MAA and methanol are esterified to obtain MMA monomer. The product of MMA monomer polymerization is commonly known as plexiglass. It has superior transparency, mechanical strength, machinability and weather resistance. It is the largest output and most widely used in acrylate products. varieties. [0003] The production of methacrylic acid (MAA) from isobutyraldehyde is the most economical process route for the production of plexiglass monomers. The process route is mainly developed by Japan Chemical Pharmaceutical Co., Ltd. (Japanese Patent Application No. 50-149611). Jilin University and others have carried out one-step oxida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/199B01J23/887B01J35/10B01J37/02C07C57/04C07C51/235
CPCB01J27/199B01J23/8877B01J23/002B01J35/10B01J35/1004B01J37/0201B01J37/024C07C51/235B01J2523/00C07C2527/199C07C2523/887B01J2523/15B01J2523/17B01J2523/3706B01J2523/3712B01J2523/41B01J2523/52B01J2523/53B01J2523/55B01J2523/68C07C57/04
Inventor 丑凌军闫亮唐卫兵王晓军赵华华张富强宋焕玲周钱
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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