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Catalyst for preparing methylacrolein through isobutene oxidation and preparation and application of catalyst

A methacrolein and catalyst technology, which is used in physical/chemical process catalysts, carbon-based compound preparation, organic compound preparation, etc. question

Active Publication Date: 2021-06-01
DALIAN 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

[0005] At present, the catalyst for the reaction of isobutene oxidation to methacrolein is mainly Mo-Bi-Fe-Co composite oxide catalyst. This composite metal catalyst has two problems that are difficult to overcome. One is that the oxidation of isobutene to methacrolein is an exothermic process. reaction, the local overheating of the catalyst bed will lead to the sublimation loss of the active component Mo in the catalyst, resulting in a decrease in catalyst activity and selectivity; the second is that the metal clusters in the metal composite oxide are difficult to uniform, resulting in less active site exposure, resulting in catalyst activity and selectivity is difficult to improve

Method used

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  • Catalyst for preparing methylacrolein through isobutene oxidation and preparation and application of catalyst
  • Catalyst for preparing methylacrolein through isobutene oxidation and preparation and application of catalyst
  • Catalyst for preparing methylacrolein through isobutene oxidation and preparation and application of catalyst

Examples

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Effect test

Embodiment 1

[0019] Mix and stir 46g of pyridine and 10g of phthalocyanine evenly, keep it under nitrogen atmosphere at 120°C for 2 hours, program the temperature at 2°C / min to 500°C for 3 hours, then program the temperature at 2°C / min to 900°C for 3 hours to obtain black powder carbon nitrogen material Precursor.

[0020] 1.4g ammonium molybdate was dissolved in 8.0g water to obtain solution A;

[0021] 0.5g bismuth nitrate, 0.3g iron nitrate, 1.6g cobalt nitrate, 0.01g nickel nitrate, 0.05g cesium nitrate, 0.01g potassium nitrate were dissolved in 2.0g 10wt% nitric acid aqueous solution to obtain solution B;

[0022] Dissolve 5.5g of F127 in 55g of absolute ethanol at 45°C to obtain solution C.

[0023] The carbon-nitrogen material precursor was added to 105 g of absolute ethanol and stirred evenly to obtain a solid-liquid mixture D.

[0024] Add 65 g of ethanol to solution B and stir to obtain solution E, then add solution A to solution E dropwise, adjust the pH between 1 and 2 with a...

Embodiment 2

[0039] The carbon-nitrogen ligands pyridine and phthalocyanine in Example 1 were replaced with urea, the calcination temperature was 1000°C, and the catalyst prepared under other conditions remained unchanged was used for the oxidation reaction of isobutene. The conversion rate of isobutene was 93.5%. Aldehyde selectivity was 87.3%.

Embodiment 3

[0041] The template agent F127 in Example 1 was replaced with CTAB, and the catalyst was prepared for the oxidation of isobutene while other conditions remained unchanged. The conversion rate of isobutene was 96.5%, and the selectivity of methacrolein was 90.1%.

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Abstract

The invention relates to a preparation method of a catalyst for preparing methylacrolein through isobutene oxidation. The preparation method comprises the following steps: roasting a carbon-nitrogen ligand to prepare a carbon-nitrogen material precursor, and fully mixing precursors of molybdenum, bismuth, cobalt, nickel, iron and alkaline metal with a mesoporous carbon-nitrogen material precursor and a template agent; and finally roasting to obtain the catalyst with molybdenum, bismuth, cobalt, nickel, iron and alkaline metal loaded on the mesoporous carbon nitrogen material skeleton, and the catalyst has high activity and product selectivity, and has good industrial application value.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for isobutene oxidation to prepare methacrolein, in particular to a catalyst in which molybdenum, bismuth, cobalt, nickel, iron and basic metals are supported on a mesoporous carbon-nitrogen material skeleton. [0002] technical background [0003] Isobutene oxidation to methacrolein is a key step in the preparation of methyl methacrylate (referred to as isobutene oxidation). Compared with the traditional ACH method, isobutene oxidation has better technical and economical efficiency. This production process is energy-saving, environmentally friendly and economically beneficial. The advantages. However, in the oxidation process of isobutene, because hydrocarbon raw materials and more active reaction products are prone to oxidation under the reaction conditions, controlling the depth of oxidation and improving the selectivity of the target product are always the most challenging technical problems...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C07C45/35C07C47/22
CPCB01J27/24C07C45/35B01J35/615C07C47/22
Inventor 高爽张毅王连月张科张大洲乔昱焱胡四斌卢文新肖敦峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI