Preparation method of catalyst for preparing acrolein through propylene oxidation

A technology for propylene oxidation and catalyst, applied in the field of catalysis, can solve the problems of high hot spot in the bed, adverse effects of catalyst selectivity and life, restricted specific surface area, etc., and achieve the effects of reducing emissions, avoiding strength reduction, reducing energy consumption and pollution

Pending Publication Date: 2022-04-08
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spherical coated catalysts are conducive to uniform bed loading, but limited by the specific surface area, the hot spots of the bed are still high, which has an adverse effect on the selectivity and life of the catalyst

Method used

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  • Preparation method of catalyst for preparing acrolein through propylene oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Weigh 1035g of deionized water, add 292g of ammonium heptamolybdate to stir and dissolve after being heated to 50°C to obtain an ammonium molybdate solution; weigh 100.4g of ferric nitrate, dissolve it in 150g of deionized water to obtain a ferric nitrate solution; The iron solution is added to the ammonium molybdate solution for co-precipitation, after the co-precipitation is completed, nitric acid is added to the system to adjust the pH of the slurry to 1, and a suspension containing iron molybdate as the core and molybdate precipitation as the shell precipitate is obtained;

[0036] 2) Mix the above suspension with 67g cobalt hydroxide and 35.8g nickel hydroxide, add 10g ethanol and transfer to a ball mill to grind for 2h to obtain a homogeneous slurry;

[0037] 3) Weigh 138g of deionized water and add 20mL of nitric acid for acidification, then add 113.8g of bismuth nitrate for dissolution. Add the bismuth nitrate solution to the above ball-milled homogeneous slu...

Embodiment 2

[0040] The amount of silica sol added in step 3) of Example 1 was adjusted to 25 g, and the catalyst calcination temperature in step 4) was adjusted to 530° C., and the others were the same as in Example 1.

Embodiment 3

[0042] The coating rate is adjusted to 50wt% in embodiment 1 step 4), other is the same as embodiment 1.

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Abstract

The invention provides a catalyst for preparing acrolein through propylene oxidation and a preparation method of the catalyst. The catalyst is of an annular coating type structure. The invention relates to a preparation method of a catalyst. The method comprises the following steps: firstly, coprecipitating ferric nitrate and ammonium molybdate to obtain ferric molybdate precipitate with molybdic acid deposited on the surface; then adding cobalt hydroxide and nickel hydroxide, and carrying out ball milling to enable cobalt, nickel and molybdic acid to react; adding bismuth nitrate to deposit bismuth on the surface layer of the composite oxide; filtering to remove ammonium nitrate in the liquid phase, pulping the precipitate, and mixing with an adhesive; and finally, spraying the slurry on the surface of the annular carrier, and firing and activating to obtain the final catalyst. Compared with the existing catalyst, the catalyst prepared by the method provided by the invention can enable the composite oxide to present layered distribution and be immobilized on the surface of the annular carrier, has better reaction performance and higher mechanical strength, and is long in service life.

Description

technical field [0001] The invention relates to the technical field of catalysis, and relates to a preparation method of a high-strength and high-activity catalyst for catalytically oxidizing gas-phase propylene into acrolein by using air or a gas containing molecular oxygen as an oxidant. Background technique [0002] At present, the industrial production of acrolein mostly adopts the gas phase contact process with propylene as the raw material. At present, the catalysts used for the oxidation of propylene to produce acrolein are mostly composite oxide systems with Mo-Bi as the main active element, and doped with Co and Ni. The activity and selectivity of the catalyst can be tuned by additive elements such as catalysts. However, due to the large heat release in the gas-phase oxidation of acrolein, the catalyst accumulates heat in the bed to generate a higher hot spot temperature, which in turn leads to the thermal sublimation of the Mo element in the active component, reduc...

Claims

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Application Information

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IPC IPC(8): B01J23/887C07C45/35C07C47/22
Inventor张利杰李贺孙雪峰张安姚烁曾贤君孙彦民
OwnerCNOOC TIANJIN CHEM RES & DESIGN INST