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Conversion of NOx by Plasma-hydrocarbon Selective Catalytic Reduction Process

플라즈마-탄화수소 선택적 촉매환원공정을 이용한 질소산화물 저감 연구

  • Jo, Jin-Oh (Department of Chemical and Biological Engineering, Jeju National University) ;
  • Mok, Young Sun (Department of Chemical and Biological Engineering, Jeju National University)
  • 조진오 (제주대학교 생명화학공학과) ;
  • 목영선 (제주대학교 생명화학공학과)
  • Received : 2017.12.02
  • Accepted : 2017.12.23
  • Published : 2018.02.10

Abstract

A plasma-catalytic combined process was used as an attempt to improve the conversion efficiency of nitrogen oxides ($NO_x$) over a wide temperature range ($150{\sim}500^{\circ}C$) to cope with the exhaust gas whose temperature varies greatly. Since the catalytic $NO_x$ reduction is effective at high temperatures where the activity of the catalyst itself is high, the $NO_x$ reduction was carried out without plasma generation in the high temperature region. On the other hand, in the low temperature region, the plasma was created in the catalyst bed to make up for the decreased catalytic activity, thereby increasing the $NO_x$ conversion efficiency. Effects of the types of catalysts, the reaction temperature, the concentration of the reducing agent (n-heptane), and the energy density on $NO_x$ conversion efficiency were examined. As a result of comparative analysis of various catalysts, the catalytic $NO_x$ conversion efficiency in the high temperature region was the highest in the case of the $Ag-Zn/{\gamma}-Al_2O_3$ catalyst of more than 90%. In the low temperature region, $NO_x$ was hardly removed by the hydrocarbon selective reduction process, but when the plasma was generated in the catalyst bed, the $NO_x$ conversion sharply increased to about 90%. The $NO_x$ conversion can be maintained high at temperatures of $150{\sim}500^{\circ}C$ by the combination of plasma in accordance with the temperature change of the exhaust gas.

Keywords

nitrogen oxides;plasma;catalyst;hydrocarbon selective catalytic reduction

Acknowledgement

Supported by : 한국연구재단

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