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

A technology for catalysts and pollutants, applied in the field of catalyst preparation, can solve the problems of poor dispersion and obvious aggregation, particles cannot enter the pores, etc., to avoid deactivation when encountering water, be beneficial to adsorption capacity, and prevent growth and aggregation. Effect

Active Publication Date: 2020-06-02
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The first step, passivation: choose MCM-41 molecular sieve with a mass of 3g, dissolve it in 80mL of n-hexane and perform ultrasonic dispersion for 15min in an ultrasonic disperser, and gradually add 7g of trimethylsilane dropwise under the condition of ultrasonic dispersion To modify, continue ultrasonic dispersion for 20min. The molecular sieve solution was condensed and refluxed at a temperature of 70°C for 12 hours, washed several times with n-hexane, and dried in an oven at a temperature of 80°C for 12 hours;

[0044] The second step, removing the template: choose the above-mentioned molecular sieve with a mass of 3g, dissolve it in 200mL of absolute ethanol, and condense and reflux for 12h at a temperature of 80°C, wash it several times with absolute ethanol, and heat it in an oven at a temperature of Drying is performed at 80°C for 12 hours, and the second step is repeated twice.

[0045] The third step, activation: select the above-mentioned molecular sieve wit...

Embodiment 2

[0050] The difference from Example 1 is:

[0051] The La, Ce, Fe metal molar ratio controlled in the 4th step is the molecular sieve of 1:1:1,

[0052] The simulated garbage pyrolysis gasification synthesis gas was selected for mercury and desulfurization experiments. H during the experiment 2 S concentration is 100mL / min, carrier gas N 2 The flow rate is 900mL / min, and the mercury and desulfurization experiment is carried out. The experimental results show that the mercury removal efficiency is about 97%, and the desulfurization efficiency is about 97%.

Embodiment 3

[0054] The difference from Example 1 is:

[0055] In the 4th step, control La, Ce, the molecular sieve that Fe metal molar ratio is 2:1:1,

[0056] The simulated garbage pyrolysis gasification synthesis gas was selected for mercury and desulfurization experiments. H during the experiment 2 S concentration is 100mL / min, carrier gas N 2 The flow rate is 900mL / min, and the mercury and desulfurization experiment is carried out. The experimental results show that the mercury removal efficiency is about 99%, and the desulfurization efficiency is about 98%. The HRTEM of the molecular sieve with a metal molar ratio of 2:1:1 finally prepared is as follows: figure 2 shown.

[0057] It can be seen from the above-mentioned Examples 1-Example 3 that the most preferred catalyst of the present invention is a molecular sieve with a metal molar ratio of La, Ce, and Fe of 2:1:1. For specific data, see image 3 shown.

[0058] Different contents of water vapor have little effect on the ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J35/10B01D53/52B01D53/64B01D53/86
CPCB01J29/0333B01J35/1004B01D53/8612B01D53/8665
Inventor 张华伟王娟孙英杰陈栋梁鹏
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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