Method for preparing catalyst for acrolein and acrylic acid

A catalyst, acrylic technology, applied in catalyst activation/preparation, preparation of organic compounds, chemical instruments and methods, etc., can solve problems such as poor catalyst stability

Inactive Publication Date: 2010-04-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method is to solve the problem of poor catalyst stability by changing the c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (Preparation of composite oxide catalyst)

[0036] Dissolve 339g of ammonium paramolybdate in 2400ml of pure water, add 520ml of 25% ammonia solution; dissolve 242g of cobalt nitrate and 130g of nickel nitrate in 300ml of pure water; In water, in addition, 116g of ferric nitrate is dissolved in 300ml of water, and the bismuth nitrate solution is mixed with the ferric nitrate solution evenly. At 50°C, add the mixed solution of cobalt nitrate and nickel nitrate to the vigorously stirred ammonia solution of ammonium molybdate, then add the mixed solution of bismuth nitrate and iron nitrate, and add ammonia water or nitric acid during the addition to make the pH of the system The value is kept between 1-6, so that the suspension described above is obtained. After heating and drying the suspension, heat treatment at 2°C / min to 300°C for 1 hr in an air atmosphere, then heat treatment at 4°C / min to 460°C for 3 hr to obtain the above primary calcined powder. Add crystalline c...

Embodiment 2

[0046] (Preparation of composite oxide catalyst)

[0047] Dissolve 339g of ammonium paramolybdate in 2400ml of pure water, add 520ml of 25% ammonia solution; dissolve 242g of cobalt nitrate and 130g of nickel nitrate in 300ml of pure water; In water, in addition, 116g of ferric nitrate is dissolved in 300ml of water, and the bismuth nitrate solution is mixed with the ferric nitrate solution evenly. At 50°C, add the mixed solution of cobalt nitrate and nickel nitrate to the vigorously stirred ammonia solution of ammonium molybdate, then add the mixed solution of bismuth nitrate and iron nitrate, and add ammonia water or nitric acid during the addition to make the pH of the system Keep it between 1-6, so that the above mentioned suspension can be obtained. After heating and drying the suspension, heat treatment at 2°C / min to 300°C for 1 hr in an air atmosphere, then heat treatment at 4°C / min to 460°C for 3 hr to obtain the above primary calcined powder. Add crystalline cellulo...

Embodiment 3

[0053] (Preparation of composite oxide catalyst)

[0054] Dissolve 339g of ammonium paramolybdate in 2400ml of pure water, add 520ml of 25% ammonia solution; dissolve 242g of cobalt nitrate and 130g of nickel nitrate in 300ml of pure water; In water, in addition, 116g of ferric nitrate is dissolved in 300ml of water, and the bismuth nitrate solution is mixed with the ferric nitrate solution evenly. At 50°C, add the mixed solution of cobalt nitrate and nickel nitrate to the vigorously stirred ammonia solution of ammonium molybdate, then add the mixed solution of bismuth nitrate and iron nitrate, and add ammonia water or nitric acid during the addition to make the pH of the system Keep it between 1-6, so that the above mentioned suspension can be obtained. After heating and drying the suspension, heat treatment at 2°C / min to 300°C for 1 hr in an air atmosphere, then heat treatment at 4°C / min to 460°C for 3 hr to obtain the above primary calcined powder. Add crystalline cellulo...

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PUM

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Abstract

The invention discloses a method for preparing a catalyst for acrolein and acrylic acid, which is characterized in that: the catalyst consists of an active component supporter and an inert alumina carrier; the main composition elements of the active component are selected from Mo, Bi, Co and/or Ni and Fe, and the active component also contains trace elements such as K, Na, Rb, Cs, Mg, Ca, Zn, B, P and W; the active component supported on the carrier accounts for 5 to 70 percent of the total weight of the catalyst; and the active component supporter is not prepared by coprecipitation, instead, initial raw materials of the elements of the above expression formula containing the active component are precipitated in aqua ammonia of ammonium molybdate step by step to prepare an active component precursor with core-shell distribution, and the active component precursor is dried and baked to prepare the active component.

Description

Technical field: [0001] The invention relates to gas-phase catalytic oxidation of propylene by gas containing molecular oxygen, and provides a method for preparing a catalyst with high activity and long life for preparing acrolein and acrylic acid. Background of the invention: [0002] Regarding the catalyst for the partial oxidation of propylene to acrolein, there have been many patent reports at home and abroad in recent years. As far as the catalyst composition is concerned, almost all of them are molybdenum-based multi-component catalysts. Many manufacturers have industrially produced such catalysts for the preparation of acrolein, or further oxidation for the preparation of acrylic acid. The main components in the catalyst include Fe 2 (MoO 4 ) 3 , α-Bi 2 (MoO 4 ) 3 、CoMoO 4 and NiMoO 4 , where α-Bi 2 (MoO 4 ) 3 It is a surface active center and acts as a selective oxidation; Fe 2 (MoO 4 ) 3 Promote redox; CoMoO 4 and NiMoO 4 play a structural stabilizi...

Claims

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Application Information

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IPC IPC(8): B01J37/03B01J37/025B01J23/887C07C47/22C07C45/35C07C57/055C07C51/235
Inventor 孙彦民于海斌李晓云曾贤君姜雪丹苗静张天壤马月谦
Owner CHINA NAT OFFSHORE OIL CORP
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