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A kind of preparation method of multi-metal composite oxide catalyst and its prepared catalyst and its application

A composite oxide and catalyst technology, which can be used in metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, preparation of carbon-based compounds, etc. Thermal control, catalyst strength, insufficient catalyst life, etc.

Active Publication Date: 2018-06-12
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the above patented methods can improve certain performances of the catalyst to a certain extent, it is still obvious that toxic waste gas will be released during the preparation process, and the catalyst prepared by using the above method can improve the effective utilization rate of unsaturated olefins and device operability (exothermic control, catalyst strength, catalyst life, etc.) are still insufficient

Method used

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  • A kind of preparation method of multi-metal composite oxide catalyst and its prepared catalyst and its application

Examples

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Effect test

Embodiment 1

[0051] (1) Preparation of catalyst

[0052] 400g ammonium heptamolybdate (NH 4 ) 6 Mo 7 o 24 .4H 2 O, 4.8g cesium carbonate Cs 2 CO 3 Put it into 800g of deionized water at 80°C and completely dissolve to obtain solution A. 260g bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, 432g cobalt nitrate Co (NO 3 ) 2 ·6H 2 O, 100g iron nitrate Fe(NO 3 ) 3 9H 2 O, 23.5g nickel nitrate Ni (NO 3 ) 2 ·6H 2 O was dropped into 800g of nitric acid solution with a mass concentration of 3.5%, and stirred until a clear and transparent solution B was obtained; under the condition of continuous stirring at 80°C, solution B was added to solution A within 30 minutes to obtain a khaki-yellow slurry C, and then Add ammonia water to control the pH value of the slurry to be about 2.5, keep stirring and aging for 24 hours, then cool down to room temperature to obtain slurry D; add 15g of gum arabic powder and 200.5g of silica sol with a mass concentration of 20% to slurry D in sequence , to obtai...

Embodiment 2

[0057] (1) Preparation of catalyst

[0058] 400g ammonium heptamolybdate, 3g potassium nitrate KNO 3Put it into 800g of deionized water at 70°C and completely dissolve to obtain solution A. Put 260g of bismuth nitrate, 350g of cobalt nitrate, 100g of iron nitrate, and 100g of nickel nitrate into 600g of nitric acid solution with a mass concentration of 3.5%, and stir until a clear and transparent solution B is obtained; under the condition of continuous stirring at 70°C, dissolve the solution within 60min Add B to solution A to obtain khaki slurry C, then add ammonia water to control the pH value of the slurry to about 2.5, keep stirring and aging for 24 hours, then cool down to room temperature to obtain slurry D; add 15g to slurry D in turn Starch, 200g of silica sol with a mass concentration of 20%, was stirred evenly to obtain slurry E. Slurry E was spray-dried at an inlet temperature of 250°C and an outlet temperature of 120°C to obtain a spray-dried powder (average par...

Embodiment 3

[0067] Put 400g of ammonium heptamolybdate and 6.2g of cesium carbonate into 1000g of deionized water at 80°C, and completely dissolve to obtain solution A. With 238.6g bismuth nitrate, 453.6g cobalt nitrate, 86.2g ferric nitrate, 27.6g nickel nitrate drop into 900g mass concentration and be in the nitric acid solution of 3.5%, stir until obtaining clear and transparent solution B; Under the situation of continuous stirring at 80 ℃, Add solution B to solution A within 90 minutes to obtain khaki-yellow slurry C, then add ammonia water to control the pH value of the slurry to about 3.0, keep stirring and aging for 10 hours, then cool down to room temperature to obtain slurry D; Adding 20g gum arabic powder successively in, 100g mass concentration is the silica sol of 20%, and 50g mass concentration is 20% (as Al 2 o 3 Calculate) the aluminum sol, obtain slurry E after stirring evenly. Slurry E was spray-dried at an inlet temperature of 250°C and an outlet temperature of 130°C ...

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Abstract

The invention relates to a preparation method of a multi-metal composite oxide catalyst, the prepared catalyst and its application. The catalyst preparation process includes 2 drying steps, adding inorganic binder and organic binder to the slurry before the first drying, and washing the dried body after the first drying to remove water-soluble substances , and then carry out the second drying, and the resulting dried body is molded and calcined to obtain the final catalyst. No toxic gas is produced during the preparation of the catalyst. The catalyst contains at least molybdenum and bismuth elements, and the peak area of ​​the peak at 2θ=13-15° on the X-ray diffraction structure is 0.1-2.0 times that of the peak at 2θ=26-27°. The catalyst wear index is less than or equal to 2%, has high service strength, and has the advantages of less heat release, high selectivity and long service life when catalyzing the selective oxidation of olefins to produce unsaturated aldehydes and / or carboxylic acids.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a multi-metal composite oxide catalyst used for oxidizing saturated olefins to prepare unsaturated aldehydes (acids) and a preparation method thereof. Background technique [0002] Preparation of unsaturated aldehydes and / or carboxylic acids by selective oxidation of olefins, such as the selective oxidation of propylene to acrolein and / or acrylic acid, the selective oxidation of isobutene (or tert-butanol) to methacrolein and / or methacrylic acid It is known that industrialized catalysts are mainly composed of composite metal oxides with molybdenum and bismuth as essential elements. These catalysts usually also contain at least one of elements such as iron, cobalt, nickel, copper and zinc. The nitric acid used in the preparation of the catalysts Salt will produce a large amount of toxic waste gas during the roasting process, which will pollute the environment and increase the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J23/888C07C45/35C07C47/22
CPCB01J23/002B01J23/8876B01J23/8885B01J2523/00C07C45/35B01J2523/15B01J2523/41B01J2523/54B01J2523/68B01J2523/842B01J2523/845B01J2523/847B01J2523/13B01J2523/31B01J2523/27B01J2523/72B01J2523/12B01J2523/17B01J2523/56B01J2523/69B01J2523/44C07C47/22
Inventor 易光铨初乃波于海彬万毅曹传宗王磊黎源华卫琦
Owner WANHUA CHEM GRP CO LTD