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Composite oxide catalyst and its preparation method and use

A composite oxide and catalyst technology, which is applied in the field of preparation of the catalyst, can solve the problems of reduced catalyst selectivity, incapable of high yield of acrylic acid, etc.

Active Publication Date: 2020-06-23
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Although the catalysts mentioned in the above patents have improved catalytic activity, there is still room for further improvement in the catalytic activity
In addition, the prominent problem existing in the existing catalysts is that although many catalysts have high activity, the selectivity of the catalyst decreases with the increase of the activity, which cannot make propylene maintain a high yield of acrylic acid stably at high space velocity for a long time

Method used

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  • Composite oxide catalyst and its preparation method and use
  • Composite oxide catalyst and its preparation method and use
  • Composite oxide catalyst and its preparation method and use

Examples

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preparation example Construction

[0066] The method of preparing the catalyst of the present invention involves forming a catalyst blank followed by firing. The catalyst blank of the present invention can be prepared by common methods known in the art.

[0067] In one example of the present invention, the preparation method includes mixing precursor compound solutions of the catalyst elements to form a mixed solution, adjusting the pH of the mixed solution to cause co-precipitation, and then drying to obtain a catalyst blank.

[0068] In another example of the present invention, the preparation method comprises dissolving Mo, V and W sources or precursor compounds in water at 70-100°C to obtain A solution, and dissolving Cu, X and Y sources or precursor compounds Dissolve in water at 60-80°C to obtain solution B, pour solution B into solution A at 40-80°C to obtain solution C, directly add component Z to the solution, stir and mix evenly to obtain solution D, and dissolve solution D Dry to obtain catalyst gre...

Embodiment 1

[0104] The first step: 60g of the above-prepared catalyst blank particles were calcined at 300°C for 5 hours in oxygen, then

[0105] Step 2: Baking at 380° C. for 5 hours in an atmosphere of 5% oxygen (the balance being nitrogen).

[0106] The performance of the catalyst was evaluated by the above method, and the results are shown in Table 1.

Embodiment 2～6

[0108] Adopt the roasting method identical with embodiment 1, just change the roasting atmosphere of the first step into nitrogen, steam, methyl alcohol, ethanol, ethylene glycol respectively.

[0109] The performance of the catalyst was evaluated by the above method, and the results are shown in Table 1.

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Abstract

The invention discloses a composite oxide catalyst as well as a preparation method and an application thereof. The catalyst is prepared by the following method: (i) a Mo, V and W source and a Cu, X and Y source and a Z component which are metered by stoichiometry are mixed in order to obtain a catalyst blank material; (ii) the catalyst blank material is calcinated in mixed gas which is formed by gas from oxygen, nitrogen, water vapor, methanol, ethanol, and glycol or one or several kinds of substances from nitrogen, water vapor, methanol, ethanol and glycol according to any proportion at 100-350 DEG C for 1-24 hours; (iii) the catalyst obtained by calcination is calcinated in an oxygen-containing atmosphere at 350-410 DEG C for 1-24 hours.

Description

technical field [0001] The present invention relates to a composite oxide catalyst having improved properties. The invention also relates to a method for the preparation of the catalyst. The catalyst prepared by the method of the invention is especially suitable for the reaction of oxidizing propylene (or isobutene) to produce acrolein (or isobutyraldehyde) or further oxidizing to produce acrylic acid (or methacrylic acid), and the catalyst has improved performance. Background technique [0002] Since the 1980s, the world's acrylic acid production equipment mainly adopts the two-step oxidation method of propylene, which has mature technology and good economy. Up to now, it is still the mainstream process in the acrylic acid industry. [0003] Catalysts for the two-step oxidation of propylene to acrylic acid have undergone a process of continuous improvement and performance improvement. At present, the space velocity of propylene in almost all industrial production units ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/888C07C51/235C07C57/055
CPCB01J23/002B01J23/8885B01J37/08B01J2523/00C07C51/235B01J2523/17B01J2523/24B01J2523/25B01J2523/53B01J2523/55B01J2523/68B01J2523/69B01J2523/56C07C57/04
Inventor 冯世强李雪梅吴通好蔡敏庄岩马建学褚小东季金华
Owner SHANGHAI HUAYI NEW MATERIAL