Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Effects of Composition in P-V-Mo Catalysts Supported on Activated Carbon for Vapor Formaldehyde Reaction

기상 포름알데히드 반응을 위한 활성탄에 담지한 P-V-Mo 촉매의 조성에 따른 영향

  • Lee, So-eun (Climate Change Research Division, Korea Institute of Energy Research (KIER)) ;
  • Kim, Seong-Soo (Climate Change Research Division, Korea Institute of Energy Research (KIER)) ;
  • Jeong, Do-Young (Quantum Optics Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Kang, Yong (Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Lee, Seung-Jae (Climate Change Research Division, Korea Institute of Energy Research (KIER))
  • 이소은 (한국에너지기술연구원 기후변화연구본부) ;
  • 김성수 (한국에너지기술연구원 기후변화연구본부) ;
  • 정도영 (한국원자력연구원 양자광학연구부) ;
  • 강용 (충남대학교 응용화학공학과) ;
  • 이승재 (한국에너지기술연구원 기후변화연구본부)
  • Received : 2019.08.01
  • Accepted : 2019.08.21
  • Published : 2019.12.01
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Abstract

In this study, heteropoly acid PVMo catalysts were supported on activated carbon with various composition of phosphoric acid ($H_3PO_4$), vanadium (V) pentoxide ($V_2O_5$) and molybdenum (VI) trioxide ($MoO_3$). Catalytic performance was examined at $140^{\circ}C$ for 1hour in vapor formaldehyde. XRD and BET analyses were carried with the catalysts before and after the reaction. Formaldehyde conversion was increased with decreasing Mo and $H_3PO_4$ content and increasing $V_2O_5$ content. Acidity of the catalysts was investigated with $NH_3-TPD$. Crystallinity of the catalysts was relatively low, and surface area was decreased after the reaction. In $NH_3-TPD$ result, the ratio of strong acid site corresponding to $NH_3$ desorption between $400^{\circ}C$ and $500^{\circ}C$ was increased by decreasing $MoO_3$ and $H_3PO_4$ content and increasing $V_2O_5$ content. Therefore, it was found that the strong acid site could affect the catalytic reactivity in vapor formaldehyde conversion.

본 연구에서는 Phosphoric acid ($H_3PO_4$)와 Vanadium (V) pentoxide ($V_2O_5$), Molybdenum (VI) trioxide ($MoO_3$)으로 부터 조성을 달리하여, heteropoly acid의 PVMo 촉매를 활성탄 지지체에 담지하였다. 촉매의 반응성 조사를 위해, 기상의 포름알데히드를 $140^{\circ}C$의 온도에서 1시간 동안 반응시켰다. 반응전후의 촉매는 XRD와 BET 분석을 수행하였으며, 촉매의 산도 측정을 위해 $NH_3-TPD$을 수행하였다. 포름알데히드의 전환율은 $MoO_3$와 $H_3PO_4$ 성분이 감소하고 $V_2O_5$ 성분이 증가함에 따라 증가하였다. 대부분의 촉매에서 비교적 낮은 촉매 결정성이 관찰되었으며, 비표면적은 반응후 다소 감소하는 것으로 나타났다. $NH_3-TPD$ 분석 결과, $400^{\circ}C{\sim}500^{\circ}C$에 해당하는 강한 산점의 비율이 $MoO_3$와 $H_3PO_4$ 성분의 함량이 감소하고 $V_2O_5$ 성분의 함량이 증가함에 따라 증가하였다. 이러한 강한 산점의 비율이 포름알데히드의 전환율에 영향을 미치는 것으로 나타났다.

Keywords

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