Catalyst capable of simultaneously removing COS and H2S in garbage gasification and preparation method thereof

A preparation method of a catalyst capable of simultaneously removing COS and H2S in garbage gasification, successively comprising the following steps:

• S1, taking a mesoporous molecular sieve SBA-15 as a carrier and pretreating the mesoporous molecular sieve SBA-15:
• dissolving the mesoporous molecular sieve SBA-15 in ethanol to be subjected to reflux in a water bath, performing washing and drying, dissolving the dried product in normal hexane, performing ultrasonic dispersion, dropwise adding a modifier to introduce halogen atoms to modify an outer surface of the mesoporous molecular sieve SBA-15, performing ultrasonic dispersion for a period of time, moving the ultrasonically treated mesoporous molecular sieve SBA-15 into a container for refluxing, and performing filtering, washing and drying to obtain the pretreated mesoporous molecular sieve SBA-15;
• S2, preparing an active component solution, wherein the active component solution is one of an MnSn solution, a FeSn solution or a ZnSn solution;
• S3, uniformly mixing the mesoporous molecular sieve SBA-15 pretreated in the step S1 with the active component solution, putting the mixture in a magnetic stirrer to be stirred at a uniform speed for a period of time, allowing the stirred mixture to stand, and performing drying;
• and
• S4, roasting the solid obtained by drying in the step S3 at a temperature of 450-550° C. for 4-6 hours, then naturally cooling the roasted solid to room temperature after roasting is finished, performing grinding and drying, and performing calcining under a N2 atmosphere to obtain the catalyst;
• wherein in the step S1, the mesoporous molecular sieve SBA-15 is dissolved in ethanol, the water bath temperature is set at 60-80° C., the reflux time is 10-13 hours, and a templating agent for the mesoporous molecular sieve SBA-15 is removed by washing and drying;
• and the mass-volume ratio of the mesoporous molecular sieve SBA-15 to ethanol is 1:20 g/mL;
• and
• wherein in the step S1, the modifier is one of chloromethyltrimethylsilane, tert-butyl bromoacetate or hydroiodic acid, and chlorine atoms are introduced by chloromethyltrimethylsilane, bromine atoms are introduced by tert-butyl bromoacetate and iodine atoms are introduced by hydroiodic acid.