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Removal of multi-pollutant from flue gas utilizing ammonium persulfate solution catalyzed by Fe/ZSM-5

Author:
Zhao, Yi, Yuan, Bo, Zheng, Zehui, Hao, Runlong
Source:
Journal of hazardous materials 2019 v.362 pp. 266-274
ISSN:
0304-3894
Subject:
ammonium, catalysts, catalytic activity, flue gas, iron, mercury, nitrates, nitric oxide, pH, sulfur dioxide, temperature, zeolites
Abstract:
A nano-sized iron loaded ZSM-5 zeolite (Fe/ZSM-5) catalyst was firstly used to activate (NH4)2S2O8 solution for the simultaneous removal of multi-pollutant from flue gas. The simultaneous removal efficiencies 100% of SO2, 72.6% of NO and 93.4% of Hg° were achieved under the condition that the catalyst dose was 0.8 g/L, concentration, pH and temperature of (NH4)2S2O8 solution were 0.03 mol/L, 5 and 65 °C, respectively. The stability of catalyst was checked by a continuous test, proving that the catalytic activity was maintained for 4 h and the leached iron reached low levels. Based on the catalyst characterizations, product analysis and literatures, the removal mechanism was speculated preliminarily, during which, OH and SO4⁻ played key roles for oxidizing NO and Hg° into NO3⁻ and Hg²⁺.
Agid:
6144778