Abstract
Selective catalytic oxidation (SCO) method is commonly used in wet denitration technology; NO after the catalytic oxidation can be removed with SO2 together by wet method. Among the SCO denitration catalysts, pyrolysis coke is favored by the advantages of low cost and high catalytic activity. In this paper, SCO method combined with pyrolysis coke catalyst was used to remove NO from flue gas. The effects of different SCO operating conditions and different pyrolysis coke catalyst made under different process conditions were studied. Besides, the specific surface area of the catalyst and functional groups were analyzed with surface area analyzer and Beohm titration. The results are: (1) The optimum operating conditions of SCO is as follows: the reaction temperature is 150°C and the oxygen content is 6%. (2) The optimum pyrolysis coke catalyst preparation processes are as follows: the pyrolysis final temperature is 750°C, and the heating rate is 44°C / min. (3) The characterization analysis can be obtained: In the denitration reaction, the basic functional groups and the phenolic hydroxyl groups of the catalyst play a major role while the specific surface area not.
Highlights
NO is an unwanted by-product of high temperature combustion where N2 from the air combines with O2 to form oxides of nitrogen [1]
Legislation requires the removal of these oxides from exhaust streams in most developed societies [2].At present, the denitration technology of selective catalytic reduction (SCR) has realized industrialization all over the world with the advantage of higher denitration efficiency and higher utilization among numerous flue gas denitration technologies [3]
More NO2 will be decomposed and the removal rate of NO will decrease with the temperature increasing [27]
Summary
NO is an unwanted by-product of high temperature combustion where N2 from the air combines with O2 to form oxides of nitrogen [1]. Legislation requires the removal of these oxides from exhaust streams in most developed societies [2].At present, the denitration technology of selective catalytic reduction (SCR) has realized industrialization all over the world with the advantage of higher denitration efficiency and higher utilization among numerous flue gas denitration technologies [3]. The SCO catalyst types are mainly activated carbon, metallic oxide catalyst, noble metal catalyst, and molecular sieve based catalysts. The activity of activated carbon is high at low temperature, but it began to decline when the temperature is over 100 ̊C [7,8,9]. The metal oxide catalyst is unstable and has low catalytic activity under high temperature condition; In
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