Abstract
Fly ash and bentonite were mixed in a certain proportion as raw materials to prepare a denitration catalyst. In previous studies, it has been concluded that fly ash-type catalysts can provide significant catalytic activity for denitrification after being modified with oxygen. In this study, the effect of plasma conditions on the denitration performance of the catalyst was investigated from the aspects of plasma modification power, modification time, and the flow rate of the gas. Boehm titration and infrared analysis systems were used to characterize the performance of the catalyst. The experimental results show that the optimal modification power is 60 W, the optimal modification time is 20 min, and the optimal gas flow rate is 40 mL/min.
Highlights
In recent years, low-temperature plasma technology has gotten many industrial applications, due to its ability to activate and convert reactive molecules at room temperature, and it is favored in flue gas denitrification
Low-temperature plasma technology can simultaneously remove a variety of pollutants during the denitration reaction, and can effectively reduce the secondary pollution caused to the environment
The experimental raw material for this study was fly ash from the combustion of circulating fluidized bed (CFB) in the Yulin Thermal Power Plant, and the elemental analysis and the ICP analysis of the raw materials was as shown in Tables 1 and 2 [12]: Table 1
Summary
Low-temperature plasma technology has gotten many industrial applications, due to its ability to activate and convert reactive molecules at room temperature, and it is favored in flue gas denitrification. Low-temperature plasma technology can simultaneously remove a variety of pollutants during the denitration reaction, and can effectively reduce the secondary pollution caused to the environment. Because the modified fly ash has a large specific surface area, it is more conducive to the enrichment of substances, such as pollutants and free radicals on the fly ash surface This improves the energy efficiency of the fly ash, and facilitates the removal of pollutants. Using plasma to modify the surface of fly ash can improve its denitrification effect, so that the fly ash type catalyst has a broader prospect in the field of denitrification. The catalyst performance was characterized by Boehm titration and infrared analysis
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