Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Effects of Concentration of Precipitants and Aging Time on Synthesis of Mn-Substituted Barium Hexaaluminates by Homogeneous Precipitation

균일용액침전법을 이용한 침전제의 농도와 합성 시간에 따른 Mn이 대체된 바륨 헥사알루미네이트의 합성의 영향

  • Park, Ji Yun (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Jung, You Shick (GN TNS Co., Ltd.) ;
  • Rhee, Young Woo (Graduate School of Energy Science and Technology, Chungnam National University)
  • 박지윤 (충남대학교 에너지과학기술대학원) ;
  • 정유식 ((주)지엔티엔에스) ;
  • 이영우 (충남대학교 에너지과학기술대학원)
  • Received : 2017.12.12
  • Accepted : 2018.01.03
  • Published : 2018.06.01
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Abstract

$BaMnAl_{11}O_{19}$ was prepared by urea-induced homogeneous precipitation and characterized by X-ray diffraction and scanning electron microscopy. At increased precipitant concentrations, AlOOH replaced $Al(OH)_3$ as an Al precursor. $BaMnAl_{11}O_{19}$ exhibited enhanced catalytic combustion performance and inhibited CO generation. Catalytic performance was also enhanced by the presence of $BaAl_2O_4$ and $BaMnAl_{11}O_{19}$. Compared to $BaAl_2O_4$, $BaMnAl_{11}O_{19}$ exhibited superior catalytic combustion activity.

$BaMnAl_{11}O_{19}$는 요소를 이용한 균일용액침전법으로 제조되었으며, X선 회절분석과 장방출 주사현미경으로 분석되었다. 침전제의 농도가 증가하면서 Al 종은 $Al(OH)_3$에서 AlOOH로 변화되었으며, 소성과정에서 $BaMnAl_{11}O_{19}$ 상으로 쉽게 변화하였다. 합성시간이 증가하면서 $BaMnAl_{11}O_{19}$ 상의 비율은 크게 증가하지 않는 반면 $BaAl_2O_4$ 상의 비율은 급격하게 증가하였다. 금속염 전구체의 반응속도는 Al, Ba, Mn 순으로 빨라, 침전제의 농도와 합성시간에 따라 $BaMnAl_{11}O_{19}$ 상의 비율이 달라진다. $BaAl_2O_4$와 $BaMnAl_{11}O_{19}$는 촉매 연소 성능을 향상시키고, $BaMnAl_{11}O_{19}$ 만이 CO 배출을 억제시키는 것을 확인하였다.

Keywords

References

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