Carbonyl sulfide hydrolysis catalyst prepared by using cobalt(Co)-nickel(Ni)-aluminum(Al) hydrotalcites as precursor and preparation method thereof

A hydrolysis catalyst, co-ni-al technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve energy saving and high desulfurization accuracy

Inactive Publication Date: 2010-08-25
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 sulfide hydrolysis catalyst prepared by using cobalt(Co)-nickel(Ni)-aluminum(Al) hydrotalcites as precursor and preparation method thereof
  • Carbonyl sulfide hydrolysis catalyst prepared by using cobalt(Co)-nickel(Ni)-aluminum(Al) hydrotalcites as precursor and preparation method thereof
  • Carbonyl sulfide hydrolysis catalyst prepared by using cobalt(Co)-nickel(Ni)-aluminum(Al) hydrotalcites as precursor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 3.2741gCo(NO 3 ) 2 ·6H 2 O, 13.086gNi(NO 3 ) 2 ·6H 2 O and 7.0337g Al(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(Co 2+ ): n(Ni 2+ )=0.25, n(Co 2+ +Ni 2+ ):n(Al 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.

[0028] (2) Transfer 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.

[0029](3) Crystallize the suspension obtained in step (2) in a water bath at 70° C. for 12 hours.

[0030] (4) The product obtained by crystallization is suction-filtered, and washed with distilled ...

Embodiment 2

[0033] (1) Weigh 3.4924gCo(NO 3 ) 2 ·6H 2 O, 13.9584gNi(NO 3 ) 2 ·6H 2 O and 7.0337g Al(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(Co 2+ ): n(Ni 2+ )=0.25, n(Co 2+ +Ni 2+ ):n(Al 3+ )=4. Take NaOH, Na 2 CO 3 As a precipitating agent, take 5.2995gNa 2 CO 3 (0.05mol) and 6.6g NaOH were dissolved in distilled water to form solution B.

[0034] (2) Transfer 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.

[0035] (3) Crystallize the suspension obtained in step (2) in a water bath at 50° C. for 12 hours.

[0036] (4) The product obtained by crystallization is suction-filtered, and washed with distilled...

Embodiment 3

[0039] (1) Weigh 3.2741gCo(NO 3 ) 2 ·6H 2 O, 13.086gNi(NO 3 ) 2 ·6H 2 O and 7.0337g Al(NO 3 ) 3 9H 2 O was dissolved in distilled water to prepare solution A so that the total metal mole was 0.075 mol. 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.

[0040] (2) Transfer 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.

[0041] (3) Crystallize the suspension obtained in step (2) in a water bath at 50° C. for 12 hours.

[0042] (4) The product obtained by crystallization is suction-filtered, and washed with distilled water to make it neutral. The obtained product was put into a...

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PUM

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Abstract

The invention provides a carbonyl sulfide hydrolysis catalyst prepared by using Co-Ni-Al-like hydrotalcite as a precursor and a preparation method thereof. The preparation method comprises the following steps of: at room temperature, dissolving cobalt nitrate, nickel nitrate and aluminum nitrate in distilled water to prepare solution A, wherein the total metal molar number is 0.75mol, n(Co2+):n(Ni2+) is equal to 0.25 to 1, and n(Co2++Ni2+):n(Al3+) is equal to 1.5 to 4; by using NaOH and Na2CO3 as precipitators, dissolving 0.05 moles of the NaOH and the Na2CO3 in the distilled water to prepare solution B; adding the solution A into the solution B dropwise to obtain suspension; and crystallizing the suspension in water bath, and then performing vacuum filtration, washing the crystals by the distilled, drying the crystals, baking the crystals in air, milling the crystals, tabletting the powder and screening the powder to obtain the hydrotalcite derivational compound oxide catalyst. The hydrolysis catalyst prepared by the method can be remove COS in gases, and simultaneously remove H2S generated in hydrolysis, and the desulfurization precision is high; and the hydrolysis catalyst can be used at the low temperature, the operational temperature is between 30 and 80 DEG C, and the energy consumption is low.

Description

technical field [0001] The invention relates to the technical field of catalysts and their preparation, in particular to a low-temperature carbonyl sulfide (COS) hydrolysis catalyst prepared with Co-Ni-Al hydrotalcite as a precursor and a preparation method thereof, mainly used for removing raw material gas carbonyl sulfide in. 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 remova...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755
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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