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Method for preparing catalyst used in selective oxo-synthesis of crylic acid from propane

A technology for selective oxidation and acrylic acid, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low propane reactivity and achieve high acrylic acid selectivity and yield effects

Inactive Publication Date: 2010-01-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Propane has low reactivity under most reaction conditions

Method used

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  • Method for preparing catalyst used in selective oxo-synthesis of crylic acid from propane
  • Method for preparing catalyst used in selective oxo-synthesis of crylic acid from propane
  • Method for preparing catalyst used in selective oxo-synthesis of crylic acid from propane

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Experimental program
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Effect test

Embodiment 1

[0023] The Mo-V-Te-Nb-O catalyst was prepared by the in-situ hydrothermal synthesis method, and the stoichiometric ammonium molybdate, vanadyl sulfate, telluric acid and niobium oxalate were respectively dissolved in hot deionized water, heated and stirred for 30min~ After 60 minutes, slowly mix the solutions together one by one, continue to stir for 30 minutes to 60 minutes, then pour all the mixed solutions into the reaction kettle, and put them in an oven for in-situ aging. The aging temperature is 170-230°C and the aging time is 40 minutes. ~70 hours. Then, it is taken out, filtered, dried, calcined at 500-700° C. for 2-5 hours, and crushed into 20-60 meshes. The catalyst sample prepared by this in-situ hydrothermal synthesis method was carried out by XRD powder diffraction method, and the results were as follows: figure 1 As shown, the electron microscope photos are as figure 2 shown.

Embodiment 2

[0025] The Mo-V-Te-Nb-O catalyst prepared in Example 1 was used in the reaction of propane to acrylic acid. Weigh about 2g of 20-60 mesh catalyst, and the reaction raw material gas ratio V(C 3 h 8 ): V(air): V(vapor)=1:15:12, the reaction pressure is normal pressure, the reaction temperature is 380°C, and the reaction space velocity is 800L Kg -1 h -1 , the reaction time is 2 hours. The conversion of propane was 63.7%, the selectivity of acrylic acid was 73.6%, and the yield was 46.9%.

Embodiment 3

[0027] Different batches of Mo-V-Te-Nb-O catalysts prepared in Example 1 were used in the reaction of propane to acrylic acid. Weigh about 2g of 20-60 mesh catalyst, and the reaction raw material gas ratio V(C 3 h 8 ): V(air): V(vapor)=1:15:12, the reaction pressure is normal pressure, the reaction temperature is 400°C, and the reaction space velocity is 800L Kg -1 h -1 , the reaction time is 2 hours. The result of the reaction is as image 3 As shown, the yield of acrylic acid is not much different, and the results of the two repetitions are very similar. It is proved that the catalyst prepared by the in situ hydrothermal synthesis method has very good repeatability of catalytic activity.

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Abstract

The invention provides a method for preparing catalyst used in selective oxo-synthesis of crylic acid from propane. The method comprises the following steps: adopting ammonium molybdate, vanadyl sulfate, hydrogen tellurate and niobium oxalate as raw materials, wherein the molar ratio of active components in form of Mo, V. Te and Nb is 1:0.2-1.0:0.2-1.0:0.1-0.5; mixing the ammonium molybdate, the vanadyl sulfate, the hydrogen tellurate and the niobium oxalate in a ratio to prepare mixed solution, putting the mixed solution into a stainless steel reaction kettle with polyfluortetraethylene lining, and placing the resulting product in an oven for in-situ aging; and taking the aged product out and subjecting the aged product to suction filtration, drying, baking and crushing to prepare the catalyst. Mo-V-Te-Nb-O catalyst prepared by adopting an in-situ hydrothermal synthesis method has high activity and product selectivity in the reaction for selective oxo-synthesis of the crylic acid from the propane with propane conversion rate equal to 63.7 percent, crylic acid selectivity equal to 73.6 percent and yield equal to 46.9 percent; moreover, the preparation method has ideal repeatability and simple synthesis process.

Description

technical field [0001] The invention relates to a method for preparing a catalyst used in the synthesis of acrylic acid by using propane as a raw material, and specifically provides a method for preparing a catalyst for the selective oxidation of propane to synthesize acrylic acid. Background technique [0002] Acrylic acid is an important petrochemical, light industry and pharmaceutical raw material. It can be used to produce adsorbents, purifiers, fibers, pulp additives, adhesives, plastics, coatings, etc., and its new uses are still expanding. At present, the industrial production of acrylic acid is mainly based on the oxidation of propylene. In terms of raw material costs, the price of propylene is higher than that of propane. With the expansion of the use of propylene, the price of propylene will rise, and the price gap will be further widened. . If the process of producing acrylic acid from propane can be industrialized, the cost of raw materials will be greatly reduc...

Claims

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Application Information

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IPC IPC(8): B01J23/16B01J23/28C07C57/05
Inventor 杨维慎楚文玲邓忠华王红心
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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