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Composite oxide catalyst and its preparing method and use

A composite oxide and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem that the active components cannot be uniformly dispersed in small grains, the product selectivity cannot be improved, and the The problem of uneven crystal structure of the catalyst can reduce energy consumption, avoid deep oxidation, and prevent excessive oxidation.

Inactive Publication Date: 2004-02-11
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

The traditional catalyst preparation technology adopts the method of co-precipitation to prepare composite oxides. This method often leads to uneven crystal structure of the catalyst and small catalyst surface area, which affects the reactivity of the catalyst.
Although the supported catalyst synthesized by the traditional impregnation method has a large specific surface area, the active components cannot be uniformly dispersed in small grains on the surface of the carrier, and the loading capacity cannot reach a high level, so the selectivity of the target product of the reaction cannot be achieved. be improved

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0052] Embodiment 1-6 (adopting sol mixing technology to prepare Ag-Bi-V-Mo-O / γ-Al 2 o 3 composite oxide catalyst)

[0053] These examples use the attached figure 1 According to the process flow shown, Ag-Bi-V-Mo-O / γ-Al with active component contents of 10%, 20%, 35%, 40%, 60%, and 80% were prepared 2 o 3 composite oxide catalyst.

[0054] (1) Preparation of stable Ag, Bi, V, Mo ion solutions.

[0055] Add 40.5 grams of EDTA acid (A.R.) to 62.5 milliliters of concentrated ammonia water, stir to obtain a clear and transparent solution, slowly add 41.23 g of Bi(NO 3 ) 3 ·5H 2 O(A.R.) into the solution, stirred until dissolved, then added 0.17 g AgNO 3 Stir to dissolve to obtain solution A.

[0056] Add 20.5 grams of EDTA acid (A.R.) and stir in 70.4 milliliters of concentrated ammonia water to obtain a clear and transparent solution, then add 4.9 grams of V 2 o 5 (A.R.), heated and stirred until completely dissolved to obtain solution B.

[0057] Add 7.94g (NH) 6 Mo...

Embodiment 7

[0064] Embodiment 7 (adopting sol mixing technology to prepare Ag-Bi-V-Mo-Te-O / γ-Al 2 o 3 composite oxide catalyst)

[0065] Weigh 10.0 g H 6 TeO 6 (A.R.) was dissolved in 30ml of distilled water at 80°C and stirred until dissolved. After cooling, it was prepared into 0.1M H with a 100ml volumetric flask. 6 TeO 6 The solution. Prepare Ag by embodiment 1 method, Bi, V, the mixed solution of Mo ion, then 5ml H 6 TeO 6 Add the solution into the mixed solution of Ag, Bi, V, Mo ions and stir, slowly add 40ml of γ-AlOOH sol and stir for 2 hours, evaporate to dryness at 150°C to obtain a black precursor, then bake at 350°C for 6 hours, and then calcine at 600°C Roast for 6 hours.

Embodiment 8

[0066] Embodiment 8 (adopting sol mixing technology to prepare Ag-Bi-Nb-Mo-O / γ-Al 2 o 3 composite oxide catalyst)

[0067] 10g NbCl 5 (A.R.) was dissolved in water, adjusted with ammonia water (1:1) to make the pH value 3-4, and a white precipitate was obtained, which was washed with distilled water until there was no Cl ion. Then dissolve with hot oxalic acid solution (30%) to obtain Nb ion solution. Get 40.5 grams of EDTA acid (A.R.) and add it to 62.5 milliliters of concentrated ammonia water, add 41.23g of Bi(NO 3 ) 3 ·5H 2 O(A.R.) into the solution, stirred until dissolved, then added 0.17 g AgNO 3 Stir to dissolve. After mixing the above two solutions, add 7.94g (NH 4 ) 6 Mo 7 o 24 4H 2 O (A.R.) and 9.5g EDTA acid (A.R.), adjust the pH value to about 9 with ammonia water, slowly add 40ml γ-AlOOH sol and stir for 2 hours, evaporate to dryness at 150°C to obtain a black precursor. Precursor at 350°C Calcined for 6 hours, after calcined at 600℃ for 6 hours, Ag-...

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Abstract

The present invention provides a kind of composite oxide catalyst for partial oxidation of propane to prepare acrylic acid. The preparation process includes following steps: dissolving or peptizing active catalyst component precursor to prepare homogeneous dispersion; dissolving or peptizing catalyst carrier component precursor to prepare homogeneous dispersion; mixing the two kinds of dispersion obtained in the previous steps to obtain stable mixed sol; drying; and roasting the composite oxide precursor to prepare the composite oxide catalyst. The composite oxide catalyst has great specific surface area, large void volume and homogeneous dispersion of the active component inside the carrier compound.

Description

technical field [0001] The invention relates to a composite oxide catalyst and its preparation method and application. Background technique [0002] Acrylic acid is an important chemical raw material. It and its ester series derivatives are widely used in coatings, chemical fibers, textiles, light industry, oil exploration, oil additives, etc. There are many processes for producing acrylic acid, and now the industry is dominated by propylene oxidation. The method is realized through two-step reactions: first, propylene is oxidized with oxygen to produce acrolein in the first reactor; in the second step, acrolein is oxidized to acrylic acid in the second reactor. The disadvantage of this reaction process is that the price of propylene is relatively high, and it includes a two-step reaction, which leads to a relatively complicated structure of the reaction system. Propane is a major component of oilfield gas, natural gas, and refinery gas, and its price is about 1 / 3 of that ...

Claims

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Application Information

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IPC IPC(8): B01J37/03
Inventor 李洪波朱红娟佟建华朱百春杨维慎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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