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High-activity flue gas desulfurization catalyst and preparation method thereof

A desulfurization catalyst and high-activity technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of strong interaction and unfavorable uniform dispersion of active components, so as to improve activity, prolong life, No clogging effect

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is also a strong interaction between the active component and the carrier, which is not conducive to the uniform dispersion of the active component on the carrier, vulcanization and further improvement of activity.

Method used

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  • High-activity flue gas desulfurization catalyst and preparation method thereof
  • High-activity flue gas desulfurization catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Add the carbon black powder to the ethanol solution containing tetraethyl orthosilicate (where the solid-liquid mass ratio is 1:8, and the tetraethyl orthosilicate is SiO 2 The mass ratio of meter to carbon black powder is 2:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 0.6kW / L, the temperature of ultrasonic dispersion is 40°C, and the time of ultrasonic dispersion is 1 hour), mix well, filter, The solid phase was dried at 50° C. for 2 hours, and then dried to obtain silicon source-modified carbon black powder;

[0050] (2) Add 54g of carbon black powder (by weight of carbon black powder) obtained in step (1) and 600g of pseudoboehmite dry rubber powder (65wt% on a dry basis of alumina) to 6g of nitric acid, 3g of citric acid, and 3g of field Cyanine powder and 360g of pure water were kneaded and extruded, then treated in nitrogen at 400°C for 3 hours, and then calcined in air at 500°C for 5 hours to obtain a silico...

Embodiment 2

[0054] (1) Add carbon black powder to ethanol solution containing tetraethyl orthosilicate (wherein the solid-to-liquid mass ratio is 1:15, and tetraethyl orthosilicate is SiO 2 The mass ratio of meter to carbon black powder is 3:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 1kW / L, the temperature of ultrasonic dispersion is 50°C, and the time of ultrasonic dispersion is 0.5 hours), mix evenly, filter, and solidify Drying at 50° C. for 2 hours, followed by drying treatment, to obtain silicon source modified carbon black powder;

[0055] (2) Add 160g of carbon black powder obtained in step (1) (based on the weight of carbon black powder), 1000g of pseudoboehmite dry rubber powder (65wt% alumina dry basis), add 10g of nitric acid, 4g of citric acid, 4g Cylindrical powder and 350g of pure water were kneaded and extruded, then treated in nitrogen at 450°C for 3 hours, and then calcined in air at 500°C for 5 hours to obtain a silic...

Embodiment 3

[0059] (1) Add the carbon black powder to the ethanol solution containing tetraethyl orthosilicate (where the liquid-solid mass ratio is 1:25, and the tetraethyl orthosilicate is SiO 2 The mass ratio of meter to carbon black powder is 4:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 2kW / L, the temperature of ultrasonic dispersion is 30°C, and the time of ultrasonic dispersion is 0.5 hours), mix evenly, filter, and solidify Drying at 50° C. for 2 hours, followed by drying treatment, to obtain silicon source modified carbon black powder;

[0060] (2) Add 160g of carbon black powder obtained in step (1) (based on the weight of carbon black powder), 800g of pseudo-boehmite dry rubber powder (65wt% alumina dry basis), add 7g of nitric acid, 3g of citric acid, 3g Cylindrical powder and 350g of pure water were kneaded and extruded, then treated in nitrogen at 400°C for 3 hours, and then calcined in air at 500°C for 5 hours to obtain a...

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Abstract

The invention discloses a high-activity flue gas desulfurization catalyst and a preparation method thereof. The catalyst of the invention contains a silicon-containing alumina carrier, active metal and carbon. With weight of the active metal as the benchmark, content of active metal is 5-20 wt% metered based on oxide, content of carbon is 1-15 wt% metered based on elements and content of the silicon-containing alumina carrier is 70-93 wt%. With weight of the silicon-containing alumina carrier as the benchmark, content of silica is 1-10 wt%. Specific surface area is 160-300 m<2> / g. Pore volume is 0.4-1.2 ml / g. The preparation method comprises the following steps: preparing at least two polyols and / or monosaccharide aqueous solutions with different concentrations, spraying the polyols and / or monosaccharide aqueous solutions onto the silicon-containing alumina carrier from high concentration to low concentration, carrying out hydro-thermal carbonization treatment in a sealed container, drying, immersing the active component, drying, and carrying out anoxic high-temperature treatment to obtain the flue gas desulfurization catalyst. The content of carbon in the catalyst is in graded distribution. The active component is easy to completely vulcanize. Desulfurization activity of the catalyst is remarkably raised, strength of the catalyst is high, and long-term operation can be stabilized.

Description

technical field [0001] The invention relates to a highly active flue gas desulfurization catalyst and a preparation method thereof. Background technique [0002] SO 2 It is the main air pollutant and the main cause of acid rain, which seriously pollutes the environment and is seriously harmful to the human body. The emission of coal-fired flue gas is SO 2 main source of . The traditional flue gas desulfurization is wet desulfurization. This method has complex process, high investment cost and secondary pollution. The dry desulfurization process is simple, but the desulfurization rate is low. Catalytic desulfurization greatly improves the efficiency of dry desulfurization. [0003] SO in flue gas 2 Catalytic reduction technology is currently the most advanced flue gas desulfurization technology in the world. It can be applied to the desulfurization of flue gas from coal-fired or oil-fired boilers. It has the advantages of low operating costs and available by-products (sulf...

Claims

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Application Information

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IPC IPC(8): B01J23/882B01J23/888B01D53/86B01D53/50
Inventor 程明珠王学海刘淑鹤王宽岭陈高升
Owner CHINA PETROLEUM & CHEM CORP
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