Composite multi-metal oxide catalyst and preparation method thereof

A composite metal and catalyst technology, applied in the field of manufacturing the composite oxide catalyst, can solve the problems of fragility, decrease in catalyst strength, increase in pressure drop in a reaction tube, and the like

Inactive Publication Date: 2016-07-20
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this change will also lead to a decrease in the strength of the catalyst and cause some problems: for example, the catalyst is easily broken during the loading process, and the bottom of the reaction tube is broken under high pressure, causing an increase in the pressure drop of the reaction tube

Method used

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  • Composite multi-metal oxide catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] 1. Catalyst Preparation

[0113] Add 450ml of water into the beaker and heat it to 65°C, add 148.64g of ammonium molybdate, 0.81g of potassium nitrate, and 1.89g of antimony trioxide, stir and dissolve to obtain solution A, and keep the temperature of solution A at 70°C. Then add 130ml of water to another beaker and heat it to 60°C, then add 56.90g of ferric nitrate, 104.98g of cobalt nitrate, 51.19g of nickel nitrate, 1.47g of cerium nitrate, and 1.07g of calcium acetate, stir and mix thoroughly, then add 3ml of nitric acid, Then slowly add 49.02g of bismuth nitrate, fully stir and dissolve to obtain solution B, and keep the temperature of solution B at 60°C. Prepare 30ml of ammonia water. Under vigorous stirring at 70°C, drop (B) solution into (A) solution, and add ammonia water to maintain the pH value of the slurry, and continue stirring until the mixture is uniform after adding. Pour the slurry into a disk, and dry it in an oven at 200° C. for 20 hours. The dried...

Embodiment 2

[0120] 1. Preparation of Catalyst

[0121] Add 450ml of water into the beaker and heat it to 65°C, add 148.64g of ammonium molybdate and 0.81g of potassium nitrate, stir and dissolve to obtain solution A, and keep the temperature of solution A at 70°C. Then add 130ml of water to another beaker and heat it to 60°C, then add 56.90g of iron nitrate, 104.98g of cobalt nitrate, and 51.19g of nickel nitrate in sequence, stir and mix thoroughly, then add 3ml of nitric acid, and then slowly add 49.02g of bismuth nitrate, Thoroughly stir to dissolve to obtain solution B, and keep the temperature of solution B at 60°C. Prepare 30ml of ammonia water. Under vigorous stirring at 70°C, drop (B) solution into (A) solution, and at the same time add ammonia water to maintain the pH value of the slurry, and continue stirring until the mixture is uniform after the addition. The slurry liquid was poured into a disk, and dried in an oven at 150° C. for 20 hours, and the dried product was pulveri...

Embodiment 3

[0135] 1. Preparation of Catalyst

[0136] The preparation method of the catalyst active precursor is the same as in Example 1. Get active phase precursor powder 200g, carry out pre-calcination under the air condition of leading 300ml / min, pre-calcination procedure is with embodiment 1, the catalyst precursor powder 100g after cooling down mixes with 10g hydroxypropyl cellulose, molding, roasting obtains catalyst.

[0137] The lateral compressive strength and wear resistance of the catalyst were measured, and the results are listed in the following table.

[0138] 2. Catalytic reaction

[0139] The catalyst prepared above was used for the partial oxidation of propylene to produce acrolein. The reaction conditions for the selective oxidation of propylene are: absolute pressure 0.1MPa, the volume space velocity of olefin relative to the catalyst is 120h -1 (STP), O 2 The molar ratio to propylene is 1.6, and the molar ratio of water vapor to propylene is 1.5.

[0140] Deter...

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Abstract

The invention discloses a composite multi-metal oxide catalyst and a preparation method thereof. The catalyst is used in a gas phase catalytic oxidation reaction for preparing acrolein from propylene or preparing methacrolein from isobutylene or tertiary butanol. The catalyst comprises the component of Mo12.5 Bib Coc Nid Fee Af Bg Ch De Oj. According to the invention, a mixed slurry of raw material salt solutions of the necessary components of the catalyst is subjected to heating treatment, such that a catalyst precursor with a weight loss of 20-37% is prepared; the catalyst precursor and / or mixed carrier is subjected to pre-roasting, such that catalyst precursor powder is obtained, wherein the weight loss of the catalyst precursor powder at a temperature of 150-520 DEG C is 3-5%; based on the weight of the precursor powder, the catalyst precursor is mixed with 18-38wt% of a binding agent (water) and / or 5-15wt% of a pore-expanding agent; and molding and roasting are carried out, such that the catalyst is obtained. The catalyst provided by the invention has good mechanical strength. The activity of the catalyst and the selectivity upon target product are substantially improved. The preparation method of the composite multi-metal oxide catalyst has high industrial application value.

Description

technical field [0001] The invention relates to a composite oxide catalyst, which is used for the gas-phase catalytic oxidation reaction of producing acrolein from propylene, isobutene or tert-butanol to produce methacrolein. The catalyst of the invention has good mechanical strength, catalyst activity and selectivity to target products. The present invention also relates to a method for producing the composite oxide catalyst. Background technique [0002] Acrylic acid and methacrylic acid are important organic chemical raw materials and intermediates of polymers. They are mainly prepared industrially by two-step gas-phase catalytic oxidation of propylene or isobutylene (tert-butanol), that is, after mixing olefins with air and water vapor in a certain proportion , into the first-stage reactor equipped with a catalyst suitable for oxidizing olefins to aldehydes, and the first-stage catalyst is a Mo-Bi composite oxide catalyst. In order to improve the production capacity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/883C07C47/22C07C45/35C07C45/37
Inventor 唐晓林李雪梅庄岩秦春华马建学褚小东季金华
Owner SHANGHAI HUAYI NEW MATERIAL
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