Carbonyl sulfur hydrolyst prepared by using binary type hydrotalcite as precursor and method for preparing same

A hydrolysis catalyst, hydrotalcite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve low operating temperature, high desulfurization accuracy, and energy saving. Effect

Inactive Publication Date: 2010-06-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] According to literature reports, the COS hydrolysis reaction is a base-catalyzed reaction, and the composite oxide after high-temperature calcination of hydrotalcite-like has a high specific surface area, dispersion and strong alkalinity, but the derivative composite oxide of hydrotalcite-like is applied to COS Hydrolysis studies have not been reported

Method used

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  • Carbonyl sulfur hydrolyst prepared by using binary type hydrotalcite as precursor and method for preparing same
  • Carbonyl sulfur hydrolyst prepared by using binary type hydrotalcite as precursor and method for preparing same
  • Carbonyl sulfur hydrolyst prepared by using binary type hydrotalcite as precursor and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 12.8205gMg(NO 3 ) 2 ·6H 2 O and 9.3782gAl(NO 3 ) 3 9H 2 O was dissolved in distilled water to make solution A, so that the total metal mole was 0.075mol, and n(Mg 2+ ):n(Al 3+ )=2. Take NaOH, Na 2 CO 3 As a precipitating agent, take 5.2995gNa 2 CO 3 (0.05mol) and 7g NaOH were dissolved in distilled water to form solution B.

[0027] (2) Move the prepared A solution to a separatory funnel and drop the A solution into the B solution at a rate of 3.6 mL / min under room temperature and mechanical stirring, and control the pH of the solution at the end of the addition to be 10. After the dropwise addition, the stirring was continued for 30 min, and finally a suspension was obtained.

[0028] (3) Crystallize the suspension obtained in step (2) in a water bath at 50° C. for 12 hours.

[0029] (4) The product obtained by crystallization is suction-filtered, and washed with distilled water to make it neutral. The obtained product was put into an oven and d...

Embodiment 2

[0032] (1) Weigh 16.3575gNi(NO 3 ) 2 ·6H 2 O and 7.575gFe(NO 3 ) 3 9H 2 O was dissolved in distilled water to make solution A, so that the total metal mole was 0.075mol, and n(Ni 2+ ):n(Fe 3+ )=3. Take NaOH, Na 2 CO 3 As a precipitating agent, take 5.2995gNa 2 CO 3 (0.05mol) and 6.75g NaOH were dissolved in distilled water to form solution B.

[0033] (2) Move the prepared A solution to a separatory funnel and drop the A solution into the B solution at a rate of 3.6 mL / min under room temperature and mechanical stirring, and control the pH of the solution at the end of the addition to be 9. After the dropwise addition, the stirring was continued for 30 min, and finally a suspension was obtained.

[0034] (3) Crystallize the suspension obtained in step (2) in a water bath at 50° C. for 12 hours.

[0035] (4) The product obtained by crystallization is suction-filtered, and washed with distilled water to make it neutral. The obtained product was put into an oven and ...

Embodiment 3

[0038] (1) Weigh 14.4231gMg(NO 3 ) 2 ·6H 2 O and 7.575g Fe(NO 3 ) 3 9H 2 O was dissolved in distilled water to make solution A, so that the total metal mole was 0.075mol, and n(Mg 2+ ):n(Fe 3+ )=3. Take NaOH, Na 2 CO 3 As a precipitating agent, take 5.2995gNa 2 CO 3 (0.05mol) and 6.75g NaOH were dissolved in distilled water to form solution B.

[0039] (2) Transfer the prepared A solution to a separatory funnel for titration. Under the conditions of room temperature and mechanical stirring, drop solution A into solution B at a rate of 3.6 mL / min, and control the pH of the solution at the end of the addition to be 9. After the dropwise addition, the stirring was continued for 30 min, and finally a suspension was obtained.

[0040] (3) Crystallize the suspension obtained in step (2) in a water bath at 50° C. for 12 hours.

[0041] (4) The product obtained by crystallization is suction-filtered, and washed with distilled water to make it neutral. The obtained produ...

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Abstract

The invention provides a carbonyl sulfur hydrolyst prepared by using binary type hydrotalcite as a precursor and a method for preparing the same. The preparation method comprises the following steps of: at room temperature, dissolving a proper amount of nickel or magnesium and aluminum or iron in distilled water to prepare solution A, and making the mol number of the total metal reach 0.075mol, and n(M2+):n(M3+) equal to 2 to 3; dissolving 0.05mol of Na2CO3 and NaOH serving as precipitators completely reacted with binary metallic ions in the distilled water to prepare solution B; and adding the solution A into the solution B dropwise, controlling a pH value of the mixed solution to be 8 to 10 to obtain suspension liquid, crystallizing the suspension liquid in water bath at the temperature of 50 DEG C for 12 hours, and performing pumping filtration, washing by the distilled water, drying, roasting, grinding, tabletting and screening to obtain the hydrotalcite-typed derivation compound oxide catalyst. The hydrolyst prepared by the method of the invention has the advantages that: COS in the gas can be removed, simultaneously H2S generated in hydrolysis is also removed, and the sulfur removing accuracy is high; and the hydrolyst can be used at a low temperature, the operating temperature is low, and the energy consumption is saved.

Description

technical field [0001] The invention relates to the technical field of catalysts and their preparation, in particular to a carbonyl sulfide hydrolysis catalyst and a preparation method prepared by using binary hydrotalcite as a precursor, and is mainly used for removing carbonyl sulfide (COS) in raw material gas. Background technique [0002] COS is the main form of organic sulfur in industrial gases. Trace amounts of COS in industrial production can easily cause catalyst poisoning and deactivation, and have a corrosive effect on industrial production equipment. In addition, COS emitted to the atmosphere without treatment can form SO 2 , promote photochemical reactions, and eventually transform into sulfate aerosols, causing serious environmental problems. Due to chemical activity ratio H 2 S is much smaller, its acidity and polarity are weaker than H 2 S, generally used to remove H 2 The method of S cannot completely remove COS effectively, so the removal of COS is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/745B01J21/10B01D53/86B01D53/48
Inventor 易红宏王红妍唐晓龙于丽丽何丹赵顺征
Owner KUNMING UNIV OF SCI & TECH
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