A catalyst for preparing methacrolein by oxidation of isobutylene and its preparation and application

Abstract

A method for preparing methacrolein catalysts for the oxidation of isobutylene, using precursor solutions of molybdenum, bismuth, cobalt, nickel, iron, manganese and basic metals and carrier 1 to fully mix to form a slurry, and then mix the obtained The slurry and the carrier 2 are fully mixed and roasted to obtain a catalyst with a core-shell morphology. The catalyst with this morphology solves the technical problems of local overheating of the catalyst, sublimation loss of the active component Mo, and deep oxidation during the oxidation process. At the same time, the morphology The catalyst has good mechanical strength, good hydrothermal stability, high selectivity to products, and good industrial application value.

Description

technical field

[0001] The present invention relates to a preparation method for the preparation of methacrolein catalyst for the oxidation of isobutene, in particular to the method of fully mixing the precursor solution of molybdenum, bismuth, cobalt, nickel, iron, manganese and basic metal with the carrier 1 to form a slurry , and then fully mixed the obtained mixed slurry with the carrier 2 and then roasted to obtain a catalyst with a core-shell morphology. Background technique

[0002] Methacrolein (MAL) is an important intermediate for the synthesis of methacrylic acid (MAA) and methyl methacrylate (MMA), and is also an important fine chemical intermediate for the synthesis of pharmaceuticals and pesticides. Isobutene oxidation to MAL is a key step in the preparation of MAA and MMA (referred to as isobutene oxidation). Compared with the traditional ACH method, the isobutene oxidation method for the preparation of MAA has better technical and economical efficiency. This ...

Examples

Embodiment 1

[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] 40g of alumina and 50g of water were evenly stirred at 45°C to obtain solution C.

[0023] Add solution B and solution A to solution C at the same time, stir evenly to obtain solution D.

[0024] Solution D and 6 g of spherical silica were stirred and mixed uniformly to obtain solution E.

[0025] Stir and age solution E for 0.1-24 hours, dry at 90-110°C for 3-24 hours, and dry at 180-300°C for 3-6 hours to obtain a solid powder, then roast the solid powder at 500°C for 3.5 hours, and analyze it by scanning electron microscope and BET specific surface area , to obtain a specific surface area of ​​122m 3 / g of core-shell catalysts.

[0026] Take 1ml of core-shell catalys...

technical field

[0001] The present invention relates to a preparation method for the preparation of methacrolein catalyst for the oxidation of isobutene, in particular to the method of fully mixing the precursor solution of molybdenum, bismuth, cobalt, nickel, iron, manganese and basic metal with the carrier 1 to form a slurry , and then fully mixed the obtained mixed slurry with the carrier 2 and then roasted to obtain a catalyst with a core-shell morphology. Background technique

[0002] Methacrolein (MAL) is an important intermediate for the synthesis of methacrylic acid (MAA) and methyl methacrylate (MMA), and is also an important fine chemical intermediate for the synthesis of pharmaceuticals and pesticides. Isobutene oxidation to MAL is a key step in the preparation of MAA and MMA (referred to as isobutene oxidation). Compared with the traditional ACH method, the isobutene oxidation method for the preparation of MAA has better technical and economical efficiency. This ...

Examples

Embodiment 1

[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] 40g of alumina and 50g of water were evenly stirred at 45°C to obtain solution C.

[0023] Add solution B and solution A to solution C at the same time, stir evenly to obtain solution D.

[0024] Solution D and 6 g of spherical silica were stirred and mixed uniformly to obtain solution E.

[0025] Stir and age solution E for 0.1-24 hours, dry at 90-110°C for 3-24 hours, and dry at 180-300°C for 3-6 hours to obtain a solid powder, then roast the solid powder at 500°C for 3.5 hours, and analyze it by scanning electron microscope and BET specific surface area , to obtain a specific surface area of ​​122m 3 / g of core-shell catalysts.

[0026] Take 1ml of core-shell catalys...