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

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....

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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.

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