Preparation method and application of Mo-V-Te-Nb-O catalyst

A technology of mo-v-te-nb-o and catalyst, which is applied in the field of preparation of Mo-V-Te-Nb-O catalyst, can solve the problems of poisoning of experimental workers and further improvement of catalytic performance, and achieve good stability The effect of high reliability and repeatability, low price and simple process flow

Inactive Publication Date: 2019-04-05
SHANDONG YUHUANG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing the Mo-V-Te-Nb-O catalyst using the existing method, it is often necessary to use highly toxic substances, which may cause greater toxicity to the experimental workers and the environment, which is not conducive to the industrial scale-up of the method, and The catalytic performance of the Mo-V-Te-Nb-O catalyst prepared by the existing method needs to be further improved

Method used

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  • Preparation method and application of Mo-V-Te-Nb-O catalyst

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preparation example Construction

[0052] According to one aspect of the present invention, the preparation method of Mo-V-Te-Nb-O catalyst is provided, comprising the following steps:

[0053] Provide reduced metal tellurium obtained by reducing high-valent tellurium compounds with reducing agents;

[0054] Put the reduced tellurium metal, molybdenum source, vanadium source, and niobium source in a solvent to react, dry the product obtained by the reaction, and roast to obtain the Mo-V-Te-Nb-O catalyst;

[0055] Wherein, the reducing agent includes any one or a combination of at least two of sodium borohydride, potassium borohydride, ascorbic acid, sodium citrate or potassium citrate; the high-valent tellurium compound is Te 4+ compound or Te 6+ compound.

[0056] Specifically, different from the use of telluric acid as the source of tellurium in the preparation method of the existing Mo-V-Te-Nb-O catalyst, in the present invention, the reduced metal tellurium obtained by reducing the high-valent tellurium c...

Embodiment approach

[0074] As an optional embodiment of the present invention, the molybdenum source includes any one or a combination of at least two of ammonium dimolybdate, ammonium tetramolybdate or ammonium paramolybdate;

[0075] And / or, the vanadium source includes vanadyl sulfate and / or ammonium metavanadate;

[0076] And / or, the source of niobium includes niobium oxalate and / or ammonium niobium oxalate.

[0077] By limiting the specific types of molybdenum source, vanadium source and niobium source, each raw material has a good coordination relationship, so that the performance of the prepared Mo-V-Te-Nb-O catalyst is at a better level.

[0078] As an optional embodiment of the present invention, the preparation method of Mo-V-Te-Nb-O catalyst comprises the following steps:

[0079] Mix the reducing agent, high-valent tellurium compound and water, and reduce at 30-200°C for 0.5-72 hours to obtain reduced metal tellurium;

[0080] Mix the reduced metal tellurium with the molybdenum sour...

Embodiment 1

[0105] The present embodiment provides a kind of preparation method of Mo-V-Te-Nb-O catalyst, comprises the following steps:

[0106] (a) Mix 0.74g of reducing agent, 1.50g of high-valent tellurium compound with water, reduce at 40°C for 5h, and then wash to obtain reduced metal tellurium; wherein, the reducing agent is sodium borohydride, the high-valent tellurium compound is telluric acid, borohydrogenated The molar ratio of sodium to telluric acid is 3:1;

[0107] (b) Mix the reduced metal tellurium with 5.00 g of ammonium paramolybdate, 1.39 g of vanadyl sulfate and water, place it in an oscillating ultrasonic instrument for 0.5 h, and then carry out a reaction at 130 ° C for 8 h under stirring conditions to obtain a mixed solution;

[0108] Mix the mixed solution with 1.83g of niobium oxalate, and carry out the secondary reaction for 5h under the condition of stirring at 130°C. After aging the product obtained by the reaction for 5h at 50°C, carry out spray drying, and th...

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Abstract

The invention provides a preparation method and application of an Mo-V-Te-Nb-O catalyst, and relates to the technical field of catalysts. Compared with an existing process in which tellurate is takenas a tellurium source, the preparation method, in which reducing metal tellurium obtained by reducing a high-valent tellurium compound by a reducing agent is taken as a tellurium source and then is mixed with and reacts with a molybdenum source, a vanadium source and a niobium source before drying and calculating to obtain the Mo-V-Te-Nb-O catalyst, has the advantages that the Mo-V-Te-Nb-O catalyst obtained by the preparation method has high catalytic activity; the reducing agent used in the preparation process is stable and easy to operate, has no toxic effect on experimenters and the environment, and is inexpensive and suitable for industrial scale. The Mo-V-Te-Nb-O catalyst prepared by the preparation method is applied to reactions of producing acrylic acid through dimethylmethane oxidation.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a preparation method and application of a Mo-V-Te-Nb-O catalyst. Background technique [0002] Acrylic acid is an important petrochemical, light industry and pharmaceutical raw material, which can be used to produce adsorbents, purifiers, fibers, pulp additives, adhesives, plastics, coatings, etc., and its application range is still expanding. [0003] At present, the main production method of acrylic acid is the propylene two-stage method, that is, propylene and oxygen react to form acrolein in the presence of a catalyst, and acrolein reacts with oxygen to form acrylic acid under the action of another catalyst. In terms of raw material costs, the price of propylene is higher than that of propane, and with the expansion of the use of propylene, the price of propylene will continue to rise, and the price gap between the two will further widen. In recent years, due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J37/16C07C57/04C07C51/215
CPCB01J23/002B01J27/0576B01J37/16B01J2523/00C07C51/215B01J2523/55B01J2523/56B01J2523/64B01J2523/68C07C57/04
Inventor 刘长城景文崔春生侯红霞王金书
Owner SHANDONG YUHUANG CHEM CO LTD
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