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Modified copper-zinc-aluminum catalyst suitable for AWS reaction as well as preparation method and application of modified copper-zinc-aluminum catalyst

A copper-zinc-aluminum catalyst and modification technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, heterogeneous catalyst chemical elements, etc., can solve the problem of low activity and achieve simple equipment, easy large-scale production, low cost effect

Active Publication Date: 2021-01-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency that the activity of the copper-zinc-aluminum catalyst is not high when the aldehyde undergoes an aldehyde-water shift reaction to make acid, and improve the copper-zinc-aluminum catalyst to increase the catalytic activity of the catalyst

Method used

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  • Modified copper-zinc-aluminum catalyst suitable for AWS reaction as well as preparation method and application of modified copper-zinc-aluminum catalyst
  • Modified copper-zinc-aluminum catalyst suitable for AWS reaction as well as preparation method and application of modified copper-zinc-aluminum catalyst
  • Modified copper-zinc-aluminum catalyst suitable for AWS reaction as well as preparation method and application of modified copper-zinc-aluminum catalyst

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preparation example Construction

[0049] In a preferred embodiment, the above-mentioned method for preparing an X-Cu-Zn-Al catalyst applied to the oxidation of aldehydes into carboxylic acids comprises the following steps:

[0050] Step 1: Take a certain amount of nitric acid X, copper nitrate, zinc nitrate and aluminum nitrate respectively, dissolve these nitrates in an appropriate amount of distilled water to make a nitrate solution; weigh a certain amount of sodium hydroxide and sodium carbonate to prepare into a mixed aqueous solution of sodium hydroxide and sodium carbonate as a precipitating agent;

[0051] Step 2: Slowly add the prepared precipitant solution drop by drop to X by co-precipitation method 2+ 、Cu 2+ , Zn 2+ 、Al 3+ In the nitrate mixed solution, until the mixed solution reacts completely, stir rapidly at the same time;

[0052] Step 3: During the whole dropping process, the pH of the solution is controlled to be about 9, and the temperature is controlled at about 50°C, then stirred at co...

Embodiment 1

[0070] Prepare Mg-doped copper-zinc-aluminum catalyst, the process is as follows:

[0071] (1) Weigh 1.2g of copper nitrate, 3g of zinc nitrate hexahydrate, 3.7g of aluminum nitrate nonahydrate, and 0.2g of magnesium nitrate, add them into 30mL of water to make a mixed aqueous solution, prepare 2.4g of sodium hydroxide and 3g of sodium carbonate and add them to 30mL of water A mixed solution of sodium hydroxide and sodium carbonate was used as a precipitating agent.

[0072] (2) Put the mixed aqueous solution in a constant temperature water bath, control the temperature to 50°C, add the mixed aqueous solution of sodium hydroxide and sodium carbonate to the mixed aqueous solution at a rate of 1 drop per second, and stir at a speed of 450rpm at the same time until the pH is 9 , continue to stir at a speed of 450rpm for 1h, let stand for 4h aging, and obtain a precipitate.

[0073] (3) Suction filter the precipitate, wash with water, dry at 110°C for 12h, put it into a muffle fu...

Embodiment 2

[0075] Prepare Ni-doped copper-zinc-aluminum catalyst, the process is as follows:

[0076] (1) Take by weighing 4.8g copper nitrate, 6g zinc nitrate hexahydrate, 7.5g aluminum nitrate nonahydrate, 4.8g nickel nitrate, add 80% water, be mixed with mixed aqueous solution, prepare 6g sodium hydroxide and 8g sodium carbonate and add in 150mL water A mixed solution of sodium hydroxide and sodium carbonate was used as a precipitating agent.

[0077] (2) The mixed aqueous solution is placed in a constant temperature water bath, the pH is controlled to be 9, and the temperature is 50 ° C. The mixed aqueous solution of sodium hydroxide and sodium carbonate is added in the mixed aqueous solution at a rate of 1 drop per second, while stirring at a speed of 500 rpm. Continue to stir at 500 rpm for 1 h until the reaction is complete, and let stand for 4 h to age to obtain a precipitate.

[0078] (3) Suction filter the precipitate, wash it with water, dry it at 110°C for 12h, put it into a...

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Abstract

The invention relates to a modified copper-zinc-aluminum catalyst suitable for an AWS reaction and a preparation method and an application thereof, the copper-zinc-aluminum catalyst comprises a dopingelement, the doping element is selected from magnesium, nickel, manganese or cobalt, and the molar ratio of the doping element to the total amount of the copper element and the doping element is (0.15-0.75): 1; the preparation method comprises the following steps: (1) respectively preparing a copper source, a zinc source, an aluminum source and a doping element source into a mixed aqueous solution, adding a precipitant aqueous solution, and carrying out neutralization reaction to obtain a precipitate; and (2) roasting the precipitate to obtain the copper-zinc-aluminum catalyst. The obtained catalyst is high in yield, copper surface dispersity is high, catalyst activity is greatly improved, the catalyst is suitable for an AWS reaction, acid-base and organic solvents do not need to be added, and the catalyst is low in cost, easy to separate, green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a modified copper-zinc-aluminum catalyst suitable for AWS reaction and its preparation method and application. Background technique [0002] Copper-zinc-aluminum catalyst is an important hydrogenation and dehydrogenation catalyst in industry, and its preparation method usually adopts coprecipitation method. At present, most of the aldehyde-to-acid reactions use oxygen as the oxidant. Although water is used as the oxidant to produce carboxylic acid through the aldehyde-water shift reaction, there are few reports. Among them, the process of preparing acid from aldehyde through aldehyde-water reaction mainly depends on the active components containing Cu, Zn, etc., and the modification of the catalyst mainly depends on the activity, selectivity and stability of the catalyst. The addition of Zn, Al, Cr and other elements can stabilize the active components and improve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/889B01J37/03B01J37/08B01J35/10C07C51/16C07C53/122
CPCB01J23/80B01J23/8892B01J23/002B01J37/03B01J37/082C07C51/16B01J2523/00B01J35/613B01J35/633B01J35/615B01J35/647B01J2523/17B01J2523/22B01J2523/27B01J2523/31B01J2523/847B01J2523/845B01J2523/72C07C53/122Y02P20/52
Inventor 叶同奇艾悦陈宝李鑫姚鑫史高杨
Owner HEFEI UNIV OF TECH
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