화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.32, No.3, 305-311, June, 2021
DOI10.14478/ace.2021.1018  Export Citation
키토산을 이용한 메조 세공 SAPO-34 촉매의 합성 및 DTO 반응
Synthesis of Mesoporous SAPO-34 Catalyst Using Chitosan and Its DTO Reaction
윤영찬, 송 강, 임정현, 박주식1, 김영호†
  • 충남대학교 응용화학공학과
  • 1한국에너지기술연구원
Young-Chan Yoon, Kang Song, Jeong-Hyeon Lim, Chu-Sik Park1, and Young-Ho Kim†
  • Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea
  • 1Korea Institute of Energy Research, Daejeon 34129, Republic of Korea
E-mail:
초록
DTO (dimethyl ether to olefins) 반응에서 촉매의 성능 향상을 목적으로 SAPO-34 촉매의 메조 세공 유도제로서 키토산의 효과를 연구했다. 합성된 촉매의 특성은 XRD, SEM, N2 adsorption-desorption isotherm 및 NH3-TPD로 분석하였다. 키토산 첨가량을 변수로 하여 개조된 SAPO-34 촉매는 기존의 SAPO-34 촉매와 동일한 입방체 형태와 카바자이트 구조를 나타내었다. 키토산의 첨가량을 3 wt%까지 증가함에 따라 제조된 촉매의 표면적 및 메조 세공 부피는 향상되었으며 약산 점의 농도 또한 증가하는 것으로 나타났다. 개조된 SAPO-34 촉매는 DTO 반응에서 향상된 촉매 수명과 높은 경질 올레핀 선택도를 나타냈다. 특히, SAPO-CHI 3 촉매(3 wt%)는 기존의 SAPO-34 촉매 수명(82 min)과 비교하여 가장 우수한 촉매 수명(140 min)을 나타냈다. 따라서 키토산이 SAPO-34 촉매의 비활성화를 억제하기 위한 메조 세공 유도제로 사용하기에 적합한 물질임을 확인했다.
Effects of chitosan as a mesopore directing agent of SAPO-34 catalysts were investigated to improve the catalytic lifetime in DTO reaction. The synthesized catalysts were characterized by XRD, SEM, N2 adsorption-desorption isotherm and NH3-temperature programmed desorption (TPD). The modified SAPO-34 catalysts prepared by varying the added amount of chitosan showed the same cubic morphology and chabazite structure as the conventional SAPO-34 catalyst. As the added amount of chitosan increased to 3 wt%, the surface area, mesopore volume and concentration of weak acid sites of modified SAPO-34 catalysts increased. The modified SAPO-34 catalysts showed enhanced catalytic lifetime and high selectivity for light olefins in the DTO reaction. In particular, the SAPO-CHI 3 catalyst (3 wt%) exhibited the longest catalytic lifetime than that of the conventional SAPO-34. Therefore, it was confirmed that chitosan was a suitable material as a mesopore directing agent to delay deactivation of the SAPO-34 catalyst.
Keywords:SAPO-34;Chitosan;Mesopore directing agent;DTO reaction
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