Anti-poisoning blast furnace gas hydrolysis catalyst with high specific surface area and preparation method thereof

A high specific surface area, hydrolysis catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc., can solve problems such as decreased desulfurization efficiency, increase the proportion of macropores, and promote low-temperature hydrolysis. The effect of increasing activity and specific surface area

Pending Publication Date: 2022-05-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the desulfurization mechanism of this catalyst is mainly adsorption and oxidation. When the activated carbon reaches adsorption saturation, the desulfurization efficiency will drop rapidly.

Method used

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  • Anti-poisoning blast furnace gas hydrolysis catalyst with high specific surface area and preparation method thereof
  • Anti-poisoning blast furnace gas hydrolysis catalyst with high specific surface area and preparation method thereof
  • Anti-poisoning blast furnace gas hydrolysis catalyst with high specific surface area and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The catalyst raw materials are: 5g of aluminum nitrate, 0.036g of polyvinyl alcohol, 0.043g of holmium nitrate, and 0.216g of potassium carbonate.

[0035] making process:

[0036] First, dissolve aluminum nitrate, potassium carbonate, and holmium nitrate in 50mL of deionized water, add polyvinyl alcohol, and stir until completely dissolved; then, under ultrasonic conditions of 80kHz, slowly add 5ml of ammonia water, ultrasonic for 10min, until the solution is uniform Then add 5ml of ammonia water again, and circulate until the pH reaches 10. After standing at 40°C for 24h, the obtained emulsion was stirred in a magnetic stirrer at a speed of 60r / min for 4h at 60°C, dried in an oven at 110°C for 24h, taken out and ground to below 100 mesh. Calcined in a furnace at 700°C for 6 hours to produce polyvinyl alcohol, Ho, K, Al 2 o 3 A hydrolysis catalyst with a mass ratio of 0.05:0.001:0.05:1.

Embodiment 2

[0038] The catalyst raw materials are: 5g of titanium dioxide, 0.072g of polyacrylamide, 0.214g of neodymium nitrate and 0.562g of sodium carbonate.

[0039]First, dissolve aluminum nitrate, sodium carbonate and neodymium nitrate in 50mL of deionized water, add polyacrylamide, and stir until completely dissolved; then, under ultrasonic conditions of 100kHz, slowly add 10ml of ammonia water, ultrasonic for 8min, until the solution is uniform Then add 10ml of ammonia water again, and circulate until the pH reaches 10. After the obtained emulsion was left to stand at 50°C for 24h, it was stirred in a magnetic stirrer at a speed of 60r / min at 70°C for 4h, dried in an oven at 120°C for 24h, taken out and ground to below 100 mesh. Calcined at 650°C for 6h in the furnace to produce polyacrylamide, Nd, Na, Al 2 o 3 A hydrolysis catalyst with a mass ratio of 0.10:0.005:0.10:1.

Embodiment 3

[0041] The preparation steps are the same as in Example 1, except that the catalyst raw materials are: 5g of titanium dioxide, 0.036g of dodecylbenzenesulfonic acid, 0.212g of lanthanum nitrate and 0.806g of calcium acetate.

[0042] The prepared catalyst is dodecylbenzenesulfonic acid, La, Ca, Al 2 o 3 A hydrolysis catalyst with a mass ratio of 0.05:0.005:0.15:1.

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Abstract

The invention discloses an anti-poisoning blast furnace gas hydrolysis catalyst with high specific surface area and a preparation method thereof, the catalyst takes gamma alumina as a carrier, takes an oxide of alkali metal as an active component, takes an oxide of rare earth metal as an auxiliary agent, and a plurality of pore-forming agents are added in the preparation process; the preparation method comprises the following steps: dissolving a precursor of aluminum, a precursor of alkali, a precursor of rare earth metal and a pore-enlarging agent in deionized water, uniformly stirring, slowly adding ammonia water in batches in the ultrasonic stirring process to adjust the pH until the precipitation is complete, standing, heating and stirring, drying, grinding and calcining to obtain the COS hydrolysis catalyst. The COS hydrolysis catalyst prepared by adding the pore-enlarging agent, the rare earth metal and the alkali metal has the advantages of higher specific surface area and more macroporous structures, higher COS hydrolysis conversion rate and H2S yield can be realized at 75 DEG C, and the service life is long; meanwhile, the preparation method is simple, convenient and easy to operate.

Description

Technical field: [0001] The invention belongs to the field of hydrolysis catalysis of blast furnace gas, and in particular relates to a high specific surface area, low temperature anti-poisoning blast furnace gas COS hydrolysis catalysis and a preparation method thereof. Background technique: [0002] With the promulgation of the "Opinions on Promoting the Implementation of Ultra-low Emissions in the Iron and Steel Industry" and other regulations, the iron and steel industry has officially entered the stage of ultra-low emission transformation. The regulations clearly state that blast furnace gas hydrogen sulfide (H 2 S)Concentration≤20mg / Nm 3 , and encourage decarbonyl sulfide (COS). Monitoring statistics show that the inorganic sulfur in blast furnace gas is mostly hydrogen sulfide, accounting for about 30%, and the organic sulfur is mostly carbonyl sulfide (COS), accounting for about The removal is the main difficulty. [0003] Hydrolysis catalytic method has become th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/04B01J35/10C10K1/00C10K1/10
CPCB01J23/10B01J23/002B01J35/1019B01J35/1038B01J35/1061C10K1/10C10K1/002C10K1/004B01J2523/00B01J2523/13B01J2523/31B01J2523/3768B01J2523/12B01J2523/3725B01J2523/23B01J2523/3706
Inventor 张亚平吴鹏沈凯刘羿良胡亚琴
Owner SOUTHEAST UNIV
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