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Preparation method of molybdenum oxide catalyst with hydrotalcite-like structure and application thereof in synthesis of methacrylic acid from isobutyraldehyde

A hydrotalcite structure, catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, organic compound preparation, physical/chemical process catalyst, etc. The effect of rich specific surface area and high selectivity

Inactive Publication Date: 2021-09-17
RUNTAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, this method also has the characteristics of long life, high catalyst activity, no polluti

Method used

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  • Preparation method of molybdenum oxide catalyst with hydrotalcite-like structure and application thereof in synthesis of methacrylic acid from isobutyraldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare the ammonium molybdate solution with a concentration of 0.2mol / L, the zinc nitrate solution with a concentration of 2mol / L, and the aluminum nitrate solution with a concentration of 2mol / L, mix and stir in equal volumes, and the stirring rate is 500r / min, and then the excess concentration is 1mol / L sodium carbonate solution (the addition of sodium carbonate is 1.5 times the total molar weight of ammonium molybdate, zinc nitrate and aluminum nitrate), using a liquid phase pump to slowly drop into the mixed solution at a flow rate of 1mL / min, continue to stir after dropping 5h, then aged for 6h, filtered after aging, washed the solid, and dried in an oven at 120°C to obtain the precursor.

[0027] Put the prepared precursor into a muffle furnace, the heating rate of the muffle furnace is 5°C / min, the calcination temperature is 450°C, and the calcination time is 5h, to obtain Mo 2 o 3 / Al 2 o 3 @ZnO Catalyst.

[0028] React the prepared catalyst in a fixed-bed...

Embodiment 2

[0034] Prepare the ammonium molybdate solution with a concentration of 1mol / L, the zinc nitrate solution with a concentration of 1.5mol / L, and the aluminum nitrate solution with a concentration of 3mol / L, mix and stir in equal volumes, and the stirring rate is 500r / min, and then make the excess concentration 1mol / L / L sodium carbonate solution (the addition of sodium carbonate is 1.4 times the total molar weight of ammonium molybdate, zinc nitrate and aluminum nitrate), using a liquid phase pump to slowly drop into the mixed solution at a flow rate of 3mL / min, continue stirring after dropping 4h, then aged for 10h, filtered after aging, washed the solid, and dried in an oven at 120°C to obtain the precursor.

[0035] Put the prepared precursor into a muffle furnace, the heating rate of the muffle furnace is 3°C / min, the calcination temperature is 600°C, and the calcination time is 3h, to obtain Mo 2 o 3 / Al 2 o 3@ZnO Catalyst.

[0036] React the prepared catalyst in a fixe...

Embodiment 3

[0038] Prepare the ammonium molybdate solution with a concentration of 0.5mol / L, the zinc nitrate solution with a concentration of 2mol / L, and the aluminum nitrate solution with a concentration of 2mol / L, mix and stir in equal volumes, and the stirring rate is 500r / min, and then the excess concentration is 1mol / L sodium carbonate solution (the molar addition of sodium carbonate is 1.4 times the total molar weight of ammonium molybdate, zinc nitrate and aluminum nitrate), using a liquid phase pump to slowly drip into the mixed solution at a flow rate of 2mL / min, continue to Stir for 3 hours, then age for 7 hours, filter after aging, wash the solid, and dry it in an oven at 120°C to obtain a precursor.

[0039] Put the prepared precursor into a muffle furnace, the heating rate of the muffle furnace is 3°C / min, the calcination temperature is 550°C, and the calcination time is 4h, to obtain Mo 2 o 3 / Al 2 o 3 @ZnO Catalyst.

[0040] React the prepared catalyst in a fixed-bed ...

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Abstract

The invention belongs to the technical field of catalysis, and discloses a preparation method of a molybdenum oxide catalyst with a hydrotalcite-like structure and application thereof in the synthesis of methacrylic acid from isobutyraldehyde. Ammonium molybdate, zinc salt and aluminum salt are used as raw materials to prepare the catalyst which has a hydrotalcite-like structure and contains molybdenum oxide, and according to the characteristics of methacrylic acid products, isobutyraldehyde is adsorbed by empty holes in an alumina-zinc oxide carrier to increase the trend of generation of carbonyl carbocations; and by combining the oxygen activation capability of molybdenum oxide and the oxyphilic characteristic of zinc oxide, the adsorbed oxygen is activated into single atoms, then the activated oxygen attacks carbocations, and finally methacrylic acid is generated. According to the method disclosed by the invention, high-selectivity methacrylic acid can be produced by oxidizing isobutyraldehyde in the continuous reactor by utilizing a synergistic effect between components in hydrotalcite and molybdenum oxide. The catalyst prepared by the method is low in cost, high in activity and good in stability, and has a very good industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for preparing methacrylic acid by molybdenum oxide having a similar hydrotalcite structure and catalyzing the oxidation of isobutyraldehyde, as well as its preparation method and application. Background technique [0002] Methacrylic acid is a colorless crystal or transparent liquid with a pungent odor. Soluble in hot water, soluble in most organic solvents such as ethanol and ether. Easy to polymerize into water-soluble polymers. It is combustible, and it may burn in case of high heat or open flame. It can produce toxic gas when heated and decomposed. It is used in organic synthesis and polymer preparation, and can be used as a raw material for synthetic rubber. Manufacture of thermosetting coatings, synthetic rubber, fabric treatment agents, etc. It is a monomer for the manufacture of acrylate solvent-based and emulsion-based adhesives to improve th...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J35/10C07C51/235C07C57/04
CPCB01J23/28B01J23/007B01J35/1004C07C51/235C07C57/04
Inventor 曹秀梅卢小松张世元
Owner RUNTAI CHEM CO LTD
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