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Catalyst as well as preparation method and application thereof

A catalyst and alumina technology, applied in the field of catalysis, can solve the problems of lowering reaction temperature, low selectivity of methacrolein, prolonging the service life of catalyst, etc., and achieves the effects of optimizing electronic structure, improving redox process and increasing selectivity

Active Publication Date: 2019-06-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a kind of catalyst and its preparation method and application, and described catalyst is applied to catalyzing the selective oxidation of isobutene and / or tert-butanol to prepare methacrolein, and it passes through in traditional molybdenum-bismuth based catalyst basis Adding elements such as copper, cerium and alkali metal elements to solve the problem of low selectivity to methacrolein in the catalytic process of traditional catalysts, and apply it to catalyze the selective oxidation of isobutene and / or tert-butanol to prepare methacrylic acid The reaction temperature in the process is also reduced, so that the service life of the catalyst is extended

Method used

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  • Catalyst as well as preparation method and application thereof
  • Catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Catalyst preparation method:

[0060] (1) 700g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 1.9g CsNO 3 , 6.7g KNO 3 Dissolve in 2000g of water at a temperature of 50°C and stir to obtain material A;

[0061] (2) 269.5g Fe(NO 3 ) 3 9H 2 O, 240g Bi(NO 3 ) 3 ·5H 2 O and 288g Co(NO 3 ) 2 ·6H 2 O is dissolved in 2000g concentration and is the nitric acid aqueous solution of 5wt.%, obtains material B;

[0062] (3) 31g Cu(NO 3 ) 2 and 58g Ce(NO 3 ) 3 ·3H 2 O is dissolved in water to obtain material C;

[0063] (4) Under stirring, sequentially add material B and material C to material A dropwise, then keep the temperature at 50°C and stir to obtain a mixed slurry, then mature at 120°C for 6 hours, evaporate the solvent at 90°C and dry, Finally, calcining at 550° C. for 4 h to obtain the catalyst powder, the composition of the catalyst is Mo 12 Bi 1.5 Fe 2 co 3 Cu 0.5 Ce 0.4 Cs 0.05 K 0.2 o h .

[0064] The above catalyst powder is granulated by a granulator to o...

Embodiment 2

[0066] Catalyst preparation method:

[0067] (1) 700g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 26g CsNO 3 , 6.7g KNO 3 Dissolve in 2000g of water at a temperature of 50°C and stir to obtain material A;

[0068] (2) 135g Fe(NO 3 ) 3 9H 2 O, 258g Bi(NO 3 ) 3 ·5H 2 O and 776g Co(NO 3 ) 2 ·6H 2 O is dissolved in 2000g concentration and is the nitric acid aqueous solution of 5wt.%, obtains material B;

[0069] (3) 6.2g Cu(NO 3 ) 2 , 58g Ce(NO 3 ) 3 ·3H 2 O is dissolved in water to obtain material C;

[0070] (4) Under stirring, sequentially add material B and material C to material A dropwise, and then keep stirring at 50°C to obtain a mixed slurry, then mature at 100°C for 6 hours, evaporate the solvent at 80°C, and dry. Finally, calcining at 450° C. for 8 h to obtain the catalyst powder, the composition of the catalyst is Mo 12 Bi 1.6 Fe 1 co 8 Cu 0.1 Ce 0.4 Cs 0.4 K 0.2 o h .

[0071] The above catalyst powder was compressed into tablets (3mm×3mm cylinder shap...

Embodiment 3

[0073] Catalyst preparation method:

[0074] (1) 700g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 26g CsNO 3 , 6g KNO 3Dissolve in 2000g of water at a temperature of 50°C and stir to obtain material A;

[0075] (2) 135g Fe(NO 3 ) 3 9H 2 O, 258g Bi(NO 3 ) 3 ·5H 2 O and 776g Co(NO 3 ) 2 ·6H 2 O is dissolved in 2000g concentration and is the nitric acid aqueous solution of 5wt.%, obtains material B;

[0076] (3) 3.1g Cu(NO 3 ) 2 , 58g Ce(NO 3 ) 3 ·3H 2 O is dissolved in water to obtain material C;

[0077] (4) Under stirring, sequentially add material B and material C to material A dropwise, and then raise the temperature to 80°C and stir to obtain a mixed slurry, and then ripen at 80°C for 6 hours, and the cured slurry Spray drying is carried out to obtain a solid powder, and finally roasted at 500° C. for 6 hours to obtain the catalyst powder, the composition of the catalyst is Mo 12 Bi 1.6 Fe 1 co 8 Cu 0.05 Ce 0.4 Cs 0.4 K 0.2 o h .

[0078] The above catalyst ...

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Abstract

The invention relates to a catalyst as well as a preparation method and application thereof, the catalyst is prepared by co-doping Cu and Ce on the basis of a traditional molybdenum-bismuth catalyst,so that the methylacrolein selectivity of the catalyst is obviously improved while a high conversion rate is kept, and the methylacrolein yield is obviously improved; and meanwhile, alkali metal elements (such as cesium, potassium and the like) are added, so that the methylacrolein selectivity of the catalyst is further obviously improved, Y element contained in the catalyst further optimizes theelectronic structure of the catalyst, and the catalytic performance of the catalyst is improved. The methylacrolein selectivity of the catalyst can reach 91.2%, and the methylacrolein yield can reach90.5% when the catalyst is used for preparing the methylacrolein by selectively oxidizing isobutylene.

Description

technical field [0001] The invention relates to the field of catalysis, in particular to a catalyst and its preparation method and application. Background technique [0002] Methyl methacrylate (MMA) is a very important organic chemical raw material and bulk chemical product, mainly through polymerization to prepare polymethyl methacrylate, polyvinyl chloride additives and acrylic fibers, and can also be used to produce adhesive agents, lubricants and coatings etc. The traditional production method of MMA is the acetone cyanohydrin method using acetone and hydrocyanic acid as raw materials. The hydrocyanic acid and sulfuric acid used in this process are highly toxic and highly corrosive, and a large amount of ammonium bisulfate by-products will be produced simultaneously. Therefore, The process has strict requirements on equipment and has a great impact on the environment. Since the 1980s, the MMA production process using isobutene or tert-butanol as raw material has been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887C07C45/38C07C45/35C07C47/22
Inventor 李春山张国梁何宏艳李杰王蕾闫瑞一张笑颖孟涛张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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