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Nitrogen-doped hydrotalcite-like derivative composite oxide material, preparation method thereof, and application of material in low-temperature carbonyl sulfide hydrolysis reaction

A composite oxide, hydrotalcite technology, applied in catalyst activation/preparation, chemical/physical process, catalytic conversion gas purification of impurities, etc., can solve the problems of uneven distribution and easy loss of alkali metal groups, and achieve excellent catalytic activity. Effect

Active Publication Date: 2020-12-18
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the loaded alkali metal group will have the problem of uneven distribution and easy loss

Method used

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  • Nitrogen-doped hydrotalcite-like derivative composite oxide material, preparation method thereof, and application of material in low-temperature carbonyl sulfide hydrolysis reaction
  • Nitrogen-doped hydrotalcite-like derivative composite oxide material, preparation method thereof, and application of material in low-temperature carbonyl sulfide hydrolysis reaction
  • Nitrogen-doped hydrotalcite-like derivative composite oxide material, preparation method thereof, and application of material in low-temperature carbonyl sulfide hydrolysis reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] N-Mg 2 - Preparation of Al-LDO catalyst

[0037] Weigh 17.45g Mg(NO 3 ) 2 ·6H 2 O, 7.50g Al(NO 3 ) 3 9H 2 Dissolve O in distilled water to form solution A; weigh 6.40g NaOH, 15.38g NaCO 3 Dissolve in distilled water to make solution B; transfer solutions A and B into a separatory funnel, drop them into a beaker filled with 50 mL of distilled water at room temperature and under mechanical stirring, and control the pH to 10.0 during the process. After the dropwise addition, the stirring was continued for 3 h to obtain a suspension, and the suspension was aged for 12 h. The aged suspension was filtered and washed three times with distilled water, and the filter cake was dried at 70° C. for 12 hours, and then dried at 120° C. for 12 hours to obtain a Mg-Al hydrotalcite precursor. The Mg-Al hydrotalcite precursor was placed in a tube furnace and calcined at 650 °C for 4 h in an ammonia atmosphere, and then the calcined product was baked in an oven at 100 °C for 1 h. ...

Embodiment 2

[0040] Nitrogen-doped Zn 2 - Preparation of Al-LDO catalyst

[0041] Weigh 17.45g Zn(NO 3 ) 2 ·6H 2 O, 7.50g Al(NO 3 ) 3 9H 2 Dissolve O in distilled water to make solution A; weigh 6.40g NaOH, 15.38g NaCO 3Dissolve in distilled water to make solution B; transfer solutions A and B into a separatory funnel, drop them into a beaker filled with 50 mL of distilled water at room temperature and under mechanical stirring, and control the pH to 10.0 during the process. After the dropwise addition, the stirring was continued for 3 h to obtain a suspension, and the suspension was aged for 12 h. The aged suspension was filtered and washed three times with distilled water, and the filter cake was dried at 70° C. for 12 hours, and then dried at 120° C. for 12 hours to obtain a Zn—Al hydrotalcite precursor. The Zn-Al hydrotalcite precursor was placed in a tube furnace and calcined at 450 °C for 4 h in an ammonia atmosphere, and then the roasted product was baked in an oven at 100 °...

Embodiment 3

[0044] Catalyst activity evaluation

[0045] Fill the catalyst prepared above in the quartz reaction tube, and use a mass flow meter to control a certain amount of COS gas and N passing through the steam generator. 2 The gas is passed into the catalyst bed for reaction (water vapor concentration / COS concentration (volume concentration percentage)=1.2), and the reacted gas is connected to a gas chromatograph for detection to investigate the composition and concentration of the reacted gas. The volume of the catalyst is 0.5mL; the particle size is 40-60 mesh; the catalyst bed temperature is 90°C; the COS concentration is 1000ppm, the water vapor concentration is 1200ppm, the total reaction gas flow rate is 50mL / min, and the reaction pressure is normal pressure.

[0046] Carbonyl sulfide conversion rate = (concentration of COS gas in the inlet gas - concentration of remaining COS gas in the outlet gas) / concentration of COS gas in the inlet gas * 100%.

[0047] Hydrogen sulfide y...

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Abstract

The invention belongs to the technical field of sulfur resource recovery, and particularly relates to a nitrogen-doped hydrotalcite-like derivative composite oxide material, a preparation method thereof and an application of the material in low-temperature carbonyl sulfide hydrolysis reaction. The nitrogen-doped hydrotalcite-like derivative composite oxide catalyst is prepared by calcining a hydrotalcite precursor in ammonia gas, and the calcining temperature is 450-750 DEG C. The nitrogen-doped hydrotalcite-like derivative composite oxide can be used for hydrolyzing carbonyl sulfide at low temperature to remove or recover carbonyl sulfide (COS) in industrial waste gas, has excellent catalytic activity, and can continuously operate for 1400 minutes without any inactivation (90 DEG C).

Description

technical field [0001] The invention relates to a nitrogen-doped hydrotalcite-like derived composite oxide material and its preparation and application in low-temperature carbonyl sulfide hydrolysis reaction, belonging to the technical field of sulfur resource recovery. Background technique [0002] Carbonyl sulfide (COS) is a poisonous and harmful sulfur-containing organic gas widely present in natural gas, water gas and industrial exhaust. The existence of COS will cause catalyst poisoning and deactivation in the subsequent production process, production equipment and instrument corrosion; in addition, if it is discharged into the atmosphere without treatment, COS will react with oxygen to form SO 2 , promote photochemical reactions, pollute the environment, and endanger human health. COS due to chemical properties than H 2 S is inactive, and its acidity and polarity are weaker than H 2 S, therefore, is generally used to remove H 2 The method of S cannot completely rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01D53/86B01D53/48B01D53/94C10L3/10C10K1/34
CPCB01J27/24B01J37/08B01D53/8606B01D53/485B01D53/94C10L3/103C10K1/34B01D2257/308
Inventor 张鑫
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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