Preparation method of catalyst for synergistic removal of hydrogen sulfide and elemental mercury in garbage gasification pollutants

Abstract

The invention discloses a preparation method of a catalyst for synergistic removal of hydrogen sulfide and elemental mercury in garbage gasification pollutants, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps of: selecting an MCM-41 molecular sieve as a raw material, and introducing a hydrophobic group SiH4 to modify the outer surface of the molecular sieve; then removing a template agent by using a certain amount of anhydrous ethanol / HCl; introducing an -SH group to modify the inner surface of the molecular sieve; and then loading a salt solution of lanthanum, cerium and iron in the modified molecular sieve, performing drying, and then conducting high temperature roasting to obtain the multi-metal oxide molecular sieve composite material used for researching the synergistic control of garbage pyrolysis gasification pollutants. The prepared catalyst has good adsorption capacity and regeneration capacity within the temperature range of 150DEG C-200DEG C, H2S and Hg<0> can be efficiently and synergistically removed, and compared with the prior art, multiple pollutants are purified at the same time, and the investment cost and the operation cost can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a preparation method of a catalyst for synergistically removing hydrogen sulfide and elemental mercury in garbage gasification pollutants. Background technique [0002] With the continuous development of the economy, the output of domestic waste in rural areas in my country has increased rapidly. Aiming at the characteristics of small scale of waste treatment in rural areas, relatively close treatment distance, poor treatment effect and less treatment funds, it is necessary to seek a reliable technology, reasonable cost, and ecological Environmentally friendly and flexible pyrolysis gasification technology is an effective way to solve the current problem of rural waste disposal. Garbage gasification is to put domestic garbage into the gasification furnace after pretreatment such as crushing and drying, and the gasification reaction occurs. Gasification synthesis gas ...

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Problems solved by technology

[0005] However, some relevant scholars have also pointed out that when mesoporous molecular sieves in the prior art are loaded with metal oxides, the particles will agglomerate or more likely cannot enter the pores at all by using the traditional impregnation method. Catalyzed Rosin Hydrogenation Reaction, Volume 27, Issue 6, Page 53, pointed out: The transmission characterization diagram of Pd / MCM-41 obtained by traditional impregnation method is as follows Figure 5 shown, from Figure 5 It can be seen that the particles loaded by impregnation method have poor dispersion and obvious aggregation, and the deposition of nanoparticles can be seen on the outer surface of the molecular sieve

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