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

A catalyst, the technology of mo-v-te-nb-o, is used in the preparation of carboxylic acids by oxidation, chemical instruments and methods, catalysts for physical/chemical processes, etc. It can solve the problems of low propane reaction activity and achieve high catalytic activity. Effect

Active Publication Date: 2009-12-30
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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  • Mo-V-Te-Nb-O catalyst, preparation method and application thereof
  • Mo-V-Te-Nb-O catalyst, preparation method and application thereof
  • Mo-V-Te-Nb-O catalyst, preparation method and application thereof

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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 temperature-programmed 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 30~ After 60 minutes, slowly and sequentially mix the solutions together, continue to stir for 30 to 60 minutes, then pour all the mixed solutions into a special stainless steel reaction kettle (such as figure 1 Shown), the temperature was programmed from room temperature to 190-200 °C at a rate of 2-10 °C / min, the holding time was 16-20 hours, and then naturally cooled to room temperature. Then take it out, filter, dry, bake at 500-700°C for 2-5 hours, and grind it into 20-40 meshes. The catalyst sample prepared by this hydrothermal synthesis method is carried out XRD powder diffraction method measurement, and the result is as follows figure 2 Shown; The scanning electron microscope photo of the catalys...

Embodiment 2

[0025] The Mo-V-Te-Nb-O catalyst prepared in Example 1 was used in the selective oxidation of propane to acrylic acid. Weigh about 2g of 20-40 mesh catalyst, 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 360°C, and the reaction space velocity is 800L Kg -1 h -1 , reacted for 2 hours. The conversion of propane was 67.3%, the selectivity of acrylic acid was 60.1%, and the yield was 40.4%.

Embodiment 3

[0027] An effective catalyst preparation method, if it is to be practical, must first ensure that the activity of any catalyst prepared by this method is similar in the reaction. In order to investigate the reproducibility of the activity of the Mo-V-Te-Nb-O catalyst prepared by the temperature-programmed hydrothermal synthesis method, we selected any two batches of catalysts synthesized by the in-situ hydrothermal synthesis method. Under the same reaction conditions, their catalytic performance in the selective oxidation of propane to acrylic acid was tested respectively. The result of the reaction is as Figure 5 shown. It can be seen from the figure that whether it is the selectivity of acrylic acid or the conversion rate of propane, the results of the two repetitions are very similar. It is proved that the catalyst prepared by the temperature-programmed hydrothermal synthesis method has very good activity repeatability.

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Abstract

The invention provides a Mo-V-Te-Nb-O catalyst, a preparation method and application thereof. The catalyst takes ammonium molybdate, vanadyl sulfate, telluric acid and niobium oxalate as raw materials, and comprises the active ingredients of Mo, V, Te and Nb in a molar mixture ratio of 1:0.2-1.0:0.2-1.0:0.1-0.5. The method comprises the steps of preparing the ammonium molybdate, the vanadyl sulfate, the telluric acid and the niobium oxalate into mixed solution according to the mixture ratio, placing the mixed solution in a specially-made stainless steel reactor, raising the temperature from room temperature to between 160 and 230 DEGC through a program at a heating rate between 2 and 10 DEG C per minute, preserving heat for 2 to 20 hours, naturally cooling to room temperature, aging, taking out, performing pumping filtration, drying, roasting, grinding the obtained product to be 20 to 40 meshes and obtaining the catalyst. The Mo-V-Te-Nb-O catalyst prepared by adopting a temperature-programmed hydrothermal synthesis method shows high catalytic activity, catalyst stability and acrylic acid selectivity in reaction for preparing acrylic acid through propane selective oxidation.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and an application for the selective oxidation of propane to acrylic acid, and specifically provides a Mo-V-Te-Nb-O catalyst, a preparation method and an application thereof. Background technique [0002] Acrylic acid and its ester series monomers are the most attractive monomers for synthetic polymers, mainly used for the synthesis of acrylate and polyacrylic acid, and polyacrylic acid is used for the production of sanitary materials, detergents, dispersants, flocculants and thickeners Acrylic esters are used in synthetic coatings, adhesives, textile, paper, leather and plastic additives. 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. ....

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/16C07C57/04C07C51/16
Inventor 杨维慎邓忠华楚文玲王红心
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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