Catalyst for hydrolyzing carbonyl sulfur and preparation method thereof

Abstract

The invention discloses a catalyst for hydrolyzing active carbon-based COS under the condition of low temperature and a preparation method thereof, wherein a carrier of the catalyst is active carbon, and active compositions of the catalyst are alkali materials and metal oxide. The catalyst can remove COS in air at a low temperature (between 30 and 100 DEG C) and remove H2S generated by hydrolysis together. The preparation method comprises the following steps: firstly, using running water and distilled water to wash the active carbon, and drying the active carbon for 2 to 4 hours at a temperature of between 110 and 180 DEG C, wherein the active carbon can be coal and coconut husks; secondly, using a 1 mol/L KOH solution to boil the washed active carbon for 1.5 to 2 hours, performing modification treatment, and using distilled water to wash the solution until the pH value is approximately 6.0; thirdly, selecting one or more metallic salt solutions to soak the active carbon, performing modification treatment, and performing ultrasonic soakage for 0.5 to 1 hour, wherein the content of a soaking liquid is 10 to 90 percent of the mass ratio of the active carbon, and the volume of the soaking liquid is as follows: 20 milliliters of the soaking liquid is added into 10 grams of the catalyst; fourthly, drying the soaked active carbon for 2 to 6 hours in a 120 DEG C constant-temperature drying cabinet, and activating the catalyst for 2 to 4 hours under the protection of 300 to 600 DEG C N2; and fifthly, performing ultrasonic soakage on the activated catalyst in the fourth step in an alkali solution for 0.5 to 1 hour.

Description

technical field [0001] The invention relates to a catalyst for removing carbonyl sulfide and hydrogen sulfide gas hydrolysis under low temperature conditions and a preparation method thereof, in particular to a catalyst for the low-temperature catalytic hydrolysis of carbonyl sulfide and a preparation method thereof, mainly used for removing carbonyl sulfide in industrial production tail gas carbonyl sulfide and hydrogen sulfide. Background technique [0002] Carbonyl sulfide (COS) and hydrogen sulfide (H 2 S) Widely exists in waste gas from coal, petroleum, and natural gas for synthesis of ammonia, methanol, and viscose fiber industries. Carbonyl sulfide is the main organic sulfur component, and the removal of H 2 It is difficult to remove S by methods such as adsorption method, tannin extraction method, and iron oxide method. Catalyzed hydrolysis string H is now mostly used 2 The method of S absorbent is removed, the process temperature is high and the investment is la...

AI Technical Summary

Problems solved by technology

[0004] The shortcomings of the catalyst invented above mainly include: (1). COS catalytic hydrolysis reaction temperature is high, sulfation poisoning is prone to occur when the oxygen concentration is high, and the catalyst life is short; (2). The application range of COS removal concentration is low, Generally, it needs to be lower than 300ppm; (3) The process flow is long, and the hydrolysis product H of COS 2 S requires subsequent processing; (4) high energy consumption, large investment, high operating costs, and prone to side reactions