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Mo-V-Te-Nb-O catalyst and preparation method and application thereof

A technology of mo-v-te-nb-o and catalysts, which is applied in chemical instruments and methods, preparation of organic compounds, physical/chemical process catalysts, etc., can solve problems such as price impact, and improve selectivity and yield , Improve stability and catalytic activity, and reduce manufacturing costs

Active Publication Date: 2021-07-09
宁波昊祥新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But tellurium dioxide has competition for other uses, and price remains one of the factors affecting the catalyst

Method used

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  • Mo-V-Te-Nb-O catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0020] A method for preparing a Mo-V-Te-Nb-O catalyst provided by an aspect of the embodiments of the present invention includes:

[0021] Heating and oxidizing low-grade tellurium raw materials to obtain tellurium oxides;

[0022] reducing the tellurium oxide with a reducing agent to obtain a sub-micron tellurium source;

[0023] React sub-micron tellurium sources, molybdenum sources, vanadium sources, and niobium sources in a solvent to obtain catalyst precursors;

[0024] The catalyst precursor is dried and calcined to prepare a Mo-V-Te-Nb-O catalyst.

[0025] In some embodiments, the preparation method specifically includes: heating low-grade tellurium powder in the presence of oxygen, thereby oxidizing to obtain tellurium oxide.

[0026] Further, the raw material used in the present invention may be low-grade metal tellurium powder, and the particle size of the low-grade metal tellurium powder may be below 5.0 μm, preferably below 2.0 μm. The purity of low-grade metal ...

Embodiment 1

[0085] A kind of Mo-V-Te-Nb-O series catalyst of this embodiment is prepared by following steps 1)~step 3):

[0086] 1) Mixing and drying: add 370.8g ammonium tetramolybdate and 65.4g ammonium metavanadate in 900g distilled water, stir and dissolve at 80°C, then add liquid A and 576g concentration of ammonia water of 2.0wt%, continue stirring for 2 hours, When the temperature of the reaction system drops to 50°C, keep stirring, and add liquid B to obtain a viscous precipitate, keep stirring for 5 minutes, then add 960g of ammonium nitrate to the reaction system, continue stirring, and finally spray the obtained slurry Dry to powder.

[0087] Wherein liquid A and liquid B can be prepared by the following methods, including:

[0088] 35.5 g of tellurium metal powder with a purity of 99% and an average particle size of 3.0 μm was charged into a crucible, and heated at 300° C. for 10 hours in a muffle furnace to obtain 45.8 g of gray powder. The obtained gray powder was added to...

Embodiment 2

[0095] The preparation process of a kind of Mo-V-Te-Nb-O series catalyst of this embodiment is basically the same as that of Example 1, the difference is:

[0096] In step 1), the heating temperature of the metal tellurium powder is 350°C.

[0097] The conversion rate of propane and the yield of acrylic acid of the prepared catalyst were evaluated under the same reaction conditions, and the results are shown in Table 1.

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Abstract

The invention discloses a Mo-V-Te-Nb-O catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: heating and oxidizing a low-grade tellurium raw material to obtain tellurium oxide; reducing the tellurium oxide by using a reducing agent to obtain a sub-micron tellurium source; and reacting the sub-micron tellurium source, a molybdenum source, a vanadium source and a niobium source in a solvent to obtain a catalyst precursor, and drying and roasting the catalyst precursor. The preparation method of the Mo-V-Te-Nb-O catalyst provided by the invention not only reduces the manufacturing cost, but also can improve the stability and catalytic activity of the catalyst. The catalyst can significantly improve the selectivity and yield of acrylic acid when applied to the reaction of preparing acrylic acid from propane.

Description

technical field [0001] The present invention relates to a metal oxide catalyst, in particular to a Mo-V-Te-Nb-O catalyst and its preparation method, and its application in the production of acrylic acid by gas-phase contact oxidation with propane-containing gas raw materials, belonging to The technical field of preparation of gas-phase oxidation catalysts. Background technique [0002] Acrylic acid is an important raw material for petrochemical, light industry and pharmaceutical production. It can be used to produce superabsorbent resin, synthetic resin and flocculant, and its application range is still expanding. Generally speaking, in the presence of Mo-Bi catalyst, acrolein and oxygen are produced by catalytic oxidation reaction of propylene and oxygen at about 400°C, and then, in the presence of Mo-V catalyst, acrolein and oxygen are catalyzed at around 300°C The oxidation reaction produces acrylic acid. [0003] In comparison, propane is a cheaper raw material than pr...

Claims

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Application Information

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IPC IPC(8): B01J23/28C07C51/215C07C57/04
CPCB01J23/28C07C51/215C07C57/04
Inventor 王成光黄庆
Owner 宁波昊祥新材料科技有限公司
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