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Carbonyl sulfide hydrolysis catalyst, preparation method and application thereof

A technology of hydrolysis catalyst and carbonyl sulfide, which is applied in the field of carbonyl sulfide hydrolysis catalyst and its preparation, which can solve the problems of short catalyst life, difficulty in industrial promotion, and low treatment concentration, and achieve uniform distribution of active components, low requirements for preparation conditions, and preparation The effect of simple process

Inactive Publication Date: 2014-12-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent US 4455466 discloses a 2 o 3 The COS hydrolysis catalyst loaded with platinum sulfide has the disadvantages of high catalyst preparation cost and short service life.
[0005] U.S. Patent US 4444987 discloses a platinum aluminum sulfide catalyst to hydrolyze COS in propylene, but the treatment effect of COS in other gases is not good. This catalyst has limitations and selectivity is not strong
[0006] Chinese patent CN 1069673 discloses a γ-Al 2 o 3 As a carrier, with 2~25% K 2 CO 3 , although the conversion rate is greater than 95%, the disadvantage is that the COS content of the feed gas is relatively low, only 5mg / m 3
[0007] Chinese patent CN 1403197 A uses rare earth hydroxides and rare earth sulfides as COS hydrolysis catalysts. The temperature used for this catalyst is 50-200°C, but the activity is relatively low when the temperature is lower than 100°C, and the COS inlet concentration is less than 300ppm. The concentration is relatively low and the cost is high
[0009] Chinese Patent No. CN 102125850 A discloses a catalyst synthesized from iron salt, zinc salt and nickel salt, which can remove hydrogen sulfide at the same time, but at 50~100°C, the space velocity is 3000h -1 The catalyst life is relatively short
[0010] The shortcomings of the above catalysts mainly include: (1) The cost of catalyst preparation is high, and it is difficult to carry out industrial promotion; (2) The temperature of catalytic hydrolysis is relatively high, and a series of side reactions are prone to occur in the presence of carbon oxides; (3) The applicable concentration range for COS removal is too narrow or the concentration is too low; (4) The preparation process conditions are relatively harsh

Method used

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  • Carbonyl sulfide hydrolysis catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Al(NO 3 ) 3 9H 2 0, Ce (NO 3 ) 3 ·6H 2 0 and Mg (NO 3 ) 2 ·6H 2 0 dissolved in deionized water at a molar ratio of Mg 2+ / (Al 3+ 、Ce 3+ ) 1.3:1, Al 3+ with Ce 3+ Molar ratio 14:1, made into solution A;

[0027] (2) Combine NaOH and Na 2 CO 3 Dissolved in deionized water, NaOH and Na 2 CO 3 The molar ratio of is 1.2:1, is dubbed solution B;

[0028] (3) Add solution B dropwise to solution A at a rate of 0.5ml / s, adjust the pH to 7.5, continue to stir to obtain a suspension, and then place the suspension in water at a temperature of 140°C for 10 hours;

[0029] (4) Filter and wash the precipitate in step (3) until the filtrate pH=7, and dry the obtained filter cake at 60°C for 8 hours;

[0030] (5) Calcinate the product obtained in step (4) for 3 hours under air condition at a temperature of 200°C, press into tablets and sieve, and take 40-60 meshes to obtain the catalyst.

[0031] When using the catalyst prepared in this example to remove COS, the ...

Embodiment 2

[0033] (1) Al(NO 3 ) 3 9H 2 0, Ce (NO 3 ) 3 ·6H 2 0 and Mg (NO 3 ) 2 ·6H 2 0 dissolved in deionized water at a molar ratio of Mg 2+ / (Al 3+ 、Ce 3+ ) 1.7:1, Al 3+ with Ce 3+ Molar ratio 18:1, made into solution A;

[0034] (2) Combine NaOH and Na 2 CO 3 Dissolved in deionized water, NaOH and Na 2 CO 3 The molar ratio of is 2:1, is dubbed solution B;

[0035] (3) Add solution B dropwise to solution A at a rate of 1ml / s, adjust the pH to 8, continue to stir to obtain a suspension, and then place the suspension in water at a temperature of 140°C for 12 hours;

[0036] (4) Filter and wash the precipitate in step (3) until the filtrate pH=7, and dry the obtained filter cake at 100°C for 12 hours;

[0037] (5) Calcinate the product obtained in step (4) for 3 hours under air condition at a temperature of 500°C, press into tablets and sieve, and take 40-60 meshes to obtain the catalyst.

[0038]When using the catalyst prepared in this example to remove COS, the catal...

Embodiment 3

[0040] (1) Al(NO 3 ) 3 9H 2 0, Ce (NO 3 ) 3 ·6H 2 0 and Mg (NO 3 ) 2 ·6H 2 0 dissolved in deionized water at a molar ratio of Mg 2+ / (Al 3+ 、Ce 3+ ) 1.5:1, Al 3+ with Ce 3+ Molar ratio 16:1, made into solution A;

[0041] (2) Combine NaOH and Na 2 CO 3 Dissolved in deionized water, NaOH and Na 2 CO 3 The molar ratio of is 1.5:1, is dubbed solution B;

[0042] (3) Add solution B dropwise to solution A at a rate of 0.8ml / s, adjust the pH to 7.6, continue to stir to obtain a suspension, and then place the suspension in water at a temperature of 140°C for 11 hours;

[0043] (4) Filter and wash the precipitate in step (3) until the filtrate pH=7, and dry the obtained filter cake at 70°C for 9 hours;

[0044] (5) Calcinate the product obtained in step (4) for 3 hours under air condition at a temperature of 300°C, press into tablets and sieve, and take 40-60 meshes to obtain the catalyst.

[0045] When using the catalyst prepared in this example to remove COS, the ...

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Abstract

The invention discloses a carbonyl sulfide hydrolysis catalyst, a preparation method and an application thereof and belongs to the technical field of catalysts. The method includes following steps: (1) preparing a solution A by dissolving a magnesium salt, an aluminium salt and a cerium salt in deionized water and preparing a solution B by dissolving a solid of NaOH and a solid of Na2CO3 in deionized water; (2) adjusting the solution A with the solution B until a pH value of the solution A is 7.5-8; (3) performing hydrothermal process to the solution A at 140 DEG C for 10-12 h; (4) filtering and washing a precipitate until the pH value of a filtrate is 7; (5) drying an obtained filter cake at 60-100 DEG C for 8-12 h; and (6) calcining the dried filter cake for 3h in the presence of oxygen at 200-500 DEG C and performing a piece-pressing process and a sieving process with the object catalyst is obtained within 40-60 meshes. The application includes following steps: (1) enabling COS to pass through a low-temperature temperature-consist tank (a water temperature is 5 DEG C); (2) under a normal pressure condition, feeding the COS to a reaction container filled with the catalyst; and (3) performing desulfurization at a reaction temperature of 30-90 DEG C with the content of the COS being 200-1200 mg / m<3> at a space velocity being 1000-10000 h<-1>. The catalyst is high in catalytic speed and has a COS conversion rate being more than 95% at a low temperature.

Description

technical field [0001] The invention relates to a carbonyl sulfide hydrolysis catalyst and its preparation method and application, belonging to the technical field of catalysts. Background technique [0002] Carbonyl sulfide (COS) widely exists in fossil fuels. The existence of these sulfur compounds will not only cause corrosion of metal pipes, catalyst poisoning, etc., but also cause environmental pollution and pose a threat to human health. Due to the stable chemical properties of COS, it is difficult to use general methods for desulfurization. At present, the hydrolysis method is the main method for removing COS in industry. Its principle is to convert COS into H by using water vapor or raw material gas in the tail gas. 2 S, followed by metal oxides, etc. to remove such as Fe 2 o 3 , ZnO, etc., and this process is a non-catalytic reaction, which is uneconomical in terms of benefits. Therefore, the key technology of hydrolysis is to develop efficient and economical ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/48
Inventor 汤立红郭惠斌李凯宁平关清卿谷俊杰段正洋
Owner KUNMING UNIV OF SCI & TECH
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