Low-temperature carbonyl sulfide hydrolysis activated carbon-supported catalyst and preparation method thereof

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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Problems solved by technology

[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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