Carbon-based desulfurization catalyst for low temperature catalytic oxidation of sulfur dioxide and its preparation and application

A desulfurization catalyst, sulfur dioxide technology, applied in physical/chemical process catalysts, catalyst carriers, inorganic chemistry, etc., can solve the problem of low operating space velocity, large amount of desulfurization agent and equipment area, complex desulfurization-regeneration-desulfurization control, etc. problem, to achieve the effect of improving desulfurization efficiency and superior performance

Active Publication Date: 2016-03-02
成都达奇科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The third object of the present invention is to provide a kind of process that applies this novel high-efficiency carbon-based desulfurization catalyst to remove sulfur dioxide in industrial waste gas and produce sulfuric acid, so as to overcome the limitations of the prior art in removing sulfur dioxide in industrial waste gas and producing sulfuric acid The operating space existing in engineering applications has low speed (-1 ), the amount of desulfurizing agent and the large area occupied by the equipment, the complex control of desulfurization-regeneration-desulfurization, and the frequent replacement of equipment operation processes, etc.

Method used

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  • Carbon-based desulfurization catalyst for low temperature catalytic oxidation of sulfur dioxide and its preparation and application
  • Carbon-based desulfurization catalyst for low temperature catalytic oxidation of sulfur dioxide and its preparation and application
  • Carbon-based desulfurization catalyst for low temperature catalytic oxidation of sulfur dioxide and its preparation and application

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Experimental program
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Effect test

Embodiment 1

[0039] The activated carbon fiber is soaked in a nitric acid solution with a mass concentration of 30%, and the surface is oxidized for about 2 hours by soaking in a constant temperature water bath at 60°C. The reacted activated carbon fibers were rinsed with deionized water to about pH 6, and then dried in an oven at about 105°C overnight. 100 grams of thiourea were dissolved in an 80% ethanol aqueous solution to prepare a 1.0 mol / L thiourea solution. Pour 100 grams of acid-washed activated carbon fibers into the above thiourea solution, mix well, slowly evaporate ethanol and water at about 60°C, and then dry in an oven at about 105°C overnight. The activated carbon fiber loaded with thiourea was placed in a muffle furnace, and under nitrogen protection, the temperature was raised from room temperature to about 900 °C at a heating rate of 5 °C / min, and kept at this temperature for about 0.5 hours, and cooled. Then the activated carbon fiber desulfurization catalyst with nitr...

Embodiment 2

[0043] The activated carbon fiber is soaked in a phosphoric acid solution with a mass concentration of 30%, and the surface is oxidized by soaking in a constant temperature water bath at a temperature of 60°C for about 2 hours. The reacted activated carbon fibers were rinsed with deionized water to a pH of about 7.2, and then dried in an oven at about 105°C overnight. Dissolve 100 g of thiourea in water to prepare a 3.0 mol / L thiourea solution. Pour 10 grams of acid-washed activated carbon fibers into the above thiourea solution, mix well, slowly evaporate the water at about 60°C, and then dry in an oven at about 105°C overnight. The activated carbon fiber loaded with thiourea was placed in a muffle furnace, and under nitrogen protection, the temperature was raised from room temperature to about 600 °C at a heating rate of 1 °C / min, and kept at this temperature for about 3 hours, and cooled. Then the activated carbon fiber desulfurization catalyst with nitrogen and sulfur het...

Embodiment 3

[0045] The activated carbon fibers were placed in a muffle furnace, and air with a flow rate of 300ml / min was introduced, and the temperature was raised from room temperature to about 300°C at a heating rate of 5°C / min, and maintained at this temperature for about 2 hours. Dissolve 10 grams of ammonium thiocyanate in water to prepare a 2.0 mol / L ammonium thiocyanate solution. Pour 100 grams of surface pre-oxidized activated carbon fibers into the above ammonium cyanide solution, mix well, slowly evaporate the water at about 60°C, and then dry in an oven at about 105°C overnight. The activated carbon fiber loaded with ammonium thiocyanate was placed in a muffle furnace, and under nitrogen protection, the temperature was raised from room temperature to about 800 °C at a heating rate of 20 °C / min, and kept at this temperature for about 2 hours. , and after cooling, an activated carbon fiber desulfurization catalyst with nitrogen and sulfur heteroatoms surface-modified with ammoni...

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Abstract

The invention discloses a carbon-based desulfurization catalyst for catalyzing and oxidating sulfur dioxide at the low temperature as well as preparation and application thereof. The carbon-based desulfurization catalyst is a desulfurization catalyst of which the activated carbon material surface is simultaneously modified by nitrogen and sulfur hetero-atoms, and the mass content of nitrogen elements and the mass content of sulfur elements are respectively 0.1%-10% and 0.1%-5% of the total mass of the carbon-based desulfurization catalyst. The preparation of the carbon base desulfurization catalyst comprises the steps as follows: firstly, the activated carbon material surface is subjected to oxidation pretreatment, is impregnated through the adoption of a hetero-atom predecessor, and then is placed into a calcinating furnace for calcination at a temperature ranging from 400 to 1000 DEG C. According to the application of the carbon-based desulfurization catalyst in the preparation of sulfuric acid through desorbing the sulfur dioxide in industrial waste gas, the industrial waste gas containing the sulfur dioxide is quenched and tempered to the state that the powder density is smaller than or equal to 50 mg / m<3>, the temperature is 50-150 DEG C, the oxygen volume content is larger than or equal to 3%, and the water vapor volume content is larger than or equal to 5%, and the industrial waste gas subjected to quenching and tempering passes through the bed layer formed by the carbon-based desulfurization catalyst, and the sulfur dioxide in the waste gas is catalyzed and oxidated into sulfur trioxide under the action of the carbon-based desulfurization catalyst, and the sulfuric acid is further generated through a reaction.

Description

technical field [0001] The invention relates to the technical field of sulfur dioxide catalytic oxidation, in particular to a carbon-based desulfurization catalyst for catalytic oxidation of sulfur dioxide at low temperature, and preparation and application thereof. Background technique [0002] my country SO 2 The pollution is serious, and more than 20 million tons of SO are emitted into the atmosphere every year. 2 , the acid rain formed is very serious to the land pollution. The wet flue gas desulfurization technology represented by the limestone-gypsum method is currently the most widely used desulfurization technology in the world. This method uses limestone as absorbent to absorb SO in flue gas 2 And generate by-product gypsum. However, in practical engineering applications, the desulfurization technology faces problems such as large corrosion and wear of equipment, large investment, large output of by-product gypsum, and low utilization value of by-product gypsum....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J21/18B01J32/00B01D53/50B01D53/86C01B17/50C01B17/74
Inventor 刘勇军尹华强程琰李新王维竹
Owner 成都达奇科技股份有限公司
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