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Preparation method of supported phosphorus-vanadium catalyst and method for synthesizing methyl acrylate by use of supported phosphorus-vanadium catalyst

A technology of phosphorus vanadium catalyst and methyl acrylate, which is applied in the preparation of organic compounds, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reduced catalytic activity and easy deactivation of catalysts, and achieve the goal of increased yield Effect

Active Publication Date: 2014-12-31
QIQIHAR UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the catalytic activity of the catalyst prepared by the existing method is easily deactivated, and the technical problem of lowering the catalytic activity is provided. Methods

Method used

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  • Preparation method of supported phosphorus-vanadium catalyst and method for synthesizing methyl acrylate by use of supported phosphorus-vanadium catalyst
  • Preparation method of supported phosphorus-vanadium catalyst and method for synthesizing methyl acrylate by use of supported phosphorus-vanadium catalyst
  • Preparation method of supported phosphorus-vanadium catalyst and method for synthesizing methyl acrylate by use of supported phosphorus-vanadium catalyst

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specific Embodiment approach 1

[0027] Specific embodiment one: the preparation method of the supported phosphorus vanadium catalyst of the present embodiment is carried out according to the following steps:

[0028] 1. Dissolve 0.3-0.8g of lactic acid in 5ml of 70-80℃ water, then add 0.3-0.8g of NH 4 VO 3 , making a vanadyl lactate solution, and then adding 0.5-2 g of phosphoric acid to the vanadyl lactate solution to obtain an impregnation solution;

[0029] Second, the macroporous SiO 2 Add it into 20ml of water and stir to obtain a suspension, then stir the suspension and impregnation solution under microwave conditions at 60-100°C for 10-20 minutes, then evaporate to dryness in a water bath, and then dry at 80-120°C , and then burned at 200°C for 2-3 hours, at 300°C for 1-3 hours, and at 450°C for 2-4 hours, then pulverized and sieved to obtain a particle size of 20-40 mesh supported phosphorus vanadium catalyst, the atomic ratio of phosphorus atoms, vanadium atoms and silicon atoms in the supported ...

specific Embodiment approach 2

[0033] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the preparation method of supported phosphorus vanadium catalyst is carried out according to the following steps:

[0034] 1. Dissolve 0.5g of lactic acid in 5ml of 70°C water, then add 0.5g of NH 4 VO 3 , making a vanadyl lactate solution, and then adding 1.3 g of phosphoric acid to the vanadyl lactate solution to obtain an impregnation solution;

[0035] Second, the macroporous SiO 2Add it into 20ml of water and stir to obtain a suspension, then stir the suspension and impregnation solution under microwave conditions at 91°C for 20 minutes, then evaporate to dryness in a water bath, and then dry at 100°C to obtain a powder. Burning at 200°C for 2 hours, burning at 300°C for 1 hour, burning at 450°C for 3 hours, then crushing and sieving to obtain supported phosphorus vanadium with a particle size of 20-40 mesh In the catalyst, the atomic ratio of phosphorus atoms, va...

specific Embodiment approach 3

[0037] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 2, the suspension and the impregnating liquid are stirred under the microwave condition of 90°C. Others are the same as in the first embodiment.

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Abstract

The invention discloses a preparation method of a supported phosphorus-vanadium catalyst and a method for synthesizing methyl acrylate by use of the supported phosphorus-vanadium catalyst, and relates to a preparation method of a catalyst and a method for synthesizing methyl acrylate by use of the catalyst. Through the invention, the technical problem that a catalyst prepared by an existing method is easily deactivated and consequently the catalytic activity is reduced is solved. The preparation method of the catalyst comprises the following steps of: (I) preparing steeping liquid; and (II) preparing a suspension, mixing the suspension with the steeping liquid, evaporating to dryness, firing, grinding and screening to obtain the catalyst. According to the invention, the supported phosphorus-vanadium catalyst prepared by taking three-dimensional ordered macroporous silicon dioxide as a carrier of a supported phosphorus-vanadium active component has a three-dimensional ordered cage structure, and the active center is uniformly supported on the catalyst; the V species in the active component of the catalyst is in amorphous phase and contains species V<4+> and V<5+>; and the aldol condensation reaction is facilitated under the synergistic effect of the species V<4+> and V<5+>. Through the invention, the prepared catalyst is applied to the field of synthesis of methyl acrylate.

Description

technical field [0001] The invention relates to a preparation method of a catalyst and a method for synthesizing methyl acrylate using the same. Background technique [0002] Through gas-solid phase reaction, methyl acetate and formaldehyde can undergo aldol condensation reaction to generate methyl acrylate when silica supports alkali metal as a catalyst. As the source of formaldehyde, formalin (formaldehyde aqueous solution) is a commonly used low-cost raw material, but a large amount of water vapor brought in by the reactant has a hindering effect on the reaction, and it will also make the catalyst with the reaction time. Prolonged and the loss of active components will lead to the phenomenon of catalyst deactivation, and the catalytic activity is low. Contents of the invention [0003] The purpose of the present invention is to solve the technical problem that the catalytic activity of the catalyst prepared by the existing method is easily deactivated and the technical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/198C07C69/54C07C67/343
Inventor 荆涛田景芝郑永杰赵云鹏
Owner QIQIHAR UNIVERSITY
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