화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.22, No.1, 9-15, March, 2016
DOI10.7464/ksct.2016.22.1.009  Export Citation
Al-Zr 혼합산화물 촉매의 제조 및 특성분석
Preparation and Characterization of Al-Zr Mixed Oxide Catalysts
박정현, 윤현기1, 신채호†
  • 충북대학교 화학공학과, 28644 충북 청주시 서원구 충대로 1
  • 1충북대학교 산학협력단, 28644 충북 청주시 서원구 충대로 1
Jung-Hyun Park, Hyun Ki Youn1, and Chae-Ho Shin†
  • Department of Chemical Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju-si, Chungbuk 28644, Korea
  • 1Industry-University Cooperation Foundation, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju-si, Chungbuk 28644, Korea
E-mail:
초록
Al/(Al+Zr)의 몰 비를 달리하여 xAl-yZr 산화물 촉매를 공침법으로 제조하였고, 모델반응으로 이소프로판올 탈수반응을 수행하였다. 제조된 촉매는 X-선 회절분석, 시차 열분석법, 질소 흡착법, 암모니아 승온탈착법, 이소프로판올 승온탈착법 등의 특성분석을 수행하였다. 지르코니아에 알루미늄 종을 첨가하면 상대적으로 넓은 비표면적을 갖는 작은 입자를 얻을 수 있으며 지르코니아의 결정상변화를 억제시켰다. 암모니아 승온탈착으로 알루미늄의 몰 비가 증가함에 따라 상대적인 산양이 증가함을 확인하였고, 이소프로판올탈수반응에서 촉매 활성 또한 증가하였다. 이러한 촉매활성은 촉매의 비표면적, 산점, 상대적으로 용이한 이소프로판올의 탈착과 연관시킬 수 있었다.
xAl-yZr mixed oxide catalysts with different molar ratios of Al/(Al+Zr) were prepared by a co-precipitation method and its catalytic performance was compared in the iso-propanol dehydration as a model reaction. The catalysts were characterized by X-ray diffraction (XRD), differential thermal analysis (DTA), N2 adsorprion-desorption, NH3 temperature programmed desorption (NH3-TPD), and iso-propanol TPD analyses. The addition of Al into ZrO2 promoted the formation of relatively small particles with large surface areas and retarded the transformation of teragonal phase to monoclnic phase. NH3-TPD results revealed that the relative acidity of the catalysts increased along with the increase of Al molar ratio. The catalytic activity for the dehydration of iso-propanol to propylene was also increased with the same tendency. The catalytic activity could be correlated with high surface area, acidity and easy desorption of iso-propanol.
Keywords:Al-Zr mixed oxide;Iso-propanol;Dehydration;Acidity;Phase transformation;IPA-TPD
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