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Investigation of modified carbon-based catalyst on low-temperature selective reduction of flue gas denitration performance
Pages: 33-38
Year: Issue:  2
Journal: Drying Technology & Equipment

Keyword:  low-temperature SCRmodified activated carbonimmersion precipitationdenitration catalyst;
Abstract: The low-temperature De NOX catalyst(LSCR) based on activated carbon was prepared by immersion precipitation method and investigated in selective catalytic reduction denitration of flue gas at low temperature. The surface structure of activated carbon is modified by oxidation and metal ion exchange, which greatly improves the dispersion and loading of active metal oxide. The added promoter(H-1) shows benefit to uniform distribution and precipitation of metal oxides in the process of immersion precipitation, additionally it can improve carbon adsorption of NH3 and active metal oxide surface in the process of the calcination, and increase the NO removal efficiency. LSCR catalyst has been made based on three kinds of different specifications of carbon materials(C1, C2 and C3). In the flue gas denitration test with different operating temperature range of 90-110 ℃ and space velocities(7500-25000 h-1), the result shows that C1 and C2 have high removal efficiency, and space velocities have great influence on the removal efficiency of activated carbon. This procedure yielded catalysts that, in conditions of high space velocities(15000h-1), shows a high catalytic activity at 100 ℃, with stable NOX conversions close to 86%,and has efficient resistance of low concentration SO2 deactivation; The sequence of ammonia into the device has great influence on denitration efficiency. Prior injection of ammonia contributes to better occupation on adsorption sites of catalyst, and increases denitration reaction rate.
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