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A carbon-based catalyst, carbonyl sulfide technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen sulfide, etc., can solve the problems of high equilibrium conversion rate, high operating cost, waste of energy, etc., and achieve good activity at room temperature and low temperature , low cost effect
Inactive Publication Date: 2010-05-12
KUNMING UNIV OF SCI & TECH
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[0004] USP 4,455,446 discloses a COS that supports platinum sulfide on γ-Al2O3 Hydrolysis catalyst, the disadvantage is that the cost of the catalyst is high, and it needs to be regenerated regularly
[0009] The above-mentioned catalysts have the following disadvantages: (1) the temperature of catalytic hydrolysis is higher, and the hydrolysis reaction is an exothermic process, and the equilibrium conversion rate is lower under high temperature; (2) waste Energy, large investment, and high operating costs. Therefore, it is very meaningful to prepare a catalyst with low applicable temperature, high removal precision, high equilibrium conversion rate, and avoid sulfation poisoning.
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Embodiment 1
[0023] (1) Take 10g of LJ-40 activated carbon, grind it with a bowl, and sieve it to 40-60 mesh, wash it with tap water and distilled water for 3-4 times, then boil it with 1mol / L KOH solution for 1.5h, then wash it with distilled water Wash until the pH is constant, and dry in a constant temperature drying oven at 120°C for 3 hours;
[0024] (2), weigh 0.16g KMnO 4 Add 3ml of distilled water, and take 3g of activated carbon pretreated in step (1) for ultrasonic impregnation for 30min;
[0025] (3), dry the impregnated activated carbon in step (2) in a constant temperature drying oven at 120°C for 3h, then put it into a muffle furnace, and activate it at 300°C for 3h;
[0026] (4) Weigh 0.29g KOH and add it into 3ml distilled water, ultrasonically impregnate the activated carbon activated in step (3) for 30min, and then keep the temperature at 120°C for 3h to obtain the activated carbon-based catalyst. The reaction conditions for the activity test are: temperature 50°C , Air...
Embodiment 2
[0028] According to the method of embodiment 1, change and weigh KMnO 4 The amount of KOH was 0.49g, and 0.55g KOH was weighed to obtain the catalyst. Activity test reaction conditions are: temperature 50°C, space velocity 1000h -1 , COS concentration 1400mg / m 3 , no H was detected at the reaction outlet 2 S, whose activity see figure 2 .
Embodiment 3
[0030] According to the method of embodiment 1, take by weighing 0.1g Na 2 CO 3 , changing the calcination temperature to 700°C to obtain the catalyst. Activity test reaction conditions are: temperature 50°C, space velocity 1000h -1 , COS concentration 1400mg / m 3 , no H was detected at the reaction outlet 2 S, whose activity see image 3 .
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Abstract
The invention relates to a preparation method of a low-temperature carbonyl sulfide hydrolysis activated carbon-supported catalyst. The method comprises the following steps: (1) grinding activated carbon, sieving the ground activated carbon to 40-60 meshes, washing for 3-4 times, then boiling for 1.5 h with l mol / L KOH solution, washing with distilled water until the pH value is constant, and then drying at the temperature of 120 DEG C for later use; (2) ultrasonic immersing the activated carbon in the step (1) with metal oxide immersion liquid with mass content accounting for 1-9 percent of that of the activated carbon for 30 min; (3) keeping the temperature of the activated carbon after immersing treatment in the step (2) constant for 3-6 h at the temperature of 120-170 DEG C, and then activating for 3 h at the temperature of 200-700 DEG C; and (4) ultrasonic immersing the activated carbon after activating in the step (3) with alkali solution with mass content accounting for 3-15 percent of that of the activated carbon for 30 min, and then keeping the temperature of the activated carbon constant for 3 h at the temperature of 110 DEG C to 160 DEG C to obtain the activated carbon-supported catalyst. The preparation method can remove the COS in the gas, simultaneously remove the H2S generated during the hydrolysis, has higher desulfurization precision, can obtain the low-cost raw material easily and also has the advantages of good activity at the normal and low temperature, low cost and the like.
Description
technical field [0001] The invention relates to the technical field of catalysts, in particular to a carbon-based catalyst for low-temperature hydrolysis of carbonyl sulfide (COS) and its preparation method and application. 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 key to realize the fine desulfurization of gas. Only by solving the removal of COS can it b...
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