Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Conversion of DME to Light Olefins over Mesoporous SAPO-34 Catalyst Prepared by Carbon Nanotube Template

탄소 나노튜브 주형물질에 의해 제조된 메조 세공 SAPO-34 촉매상에서 경질 올레핀으로의 DME 전환 반응

  • Kang, Eun-Jee (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Lee, Dong-Hee (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Kim, Hyo-Sub (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Choi, Ki-Hwan (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Park, Chu-Sik (Hydrogen and fuel cell department, Korea Institute of Energy Research) ;
  • Kim, Young-Ho (Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University)
  • 강은지 (충남대학교 정밀응용화학과) ;
  • 이동희 (충남대학교 정밀응용화학과) ;
  • 김효섭 (충남대학교 정밀응용화학과) ;
  • 최기환 (충남대학교 정밀응용화학과) ;
  • 박주식 (한국에너지기술연구원 수소연료전지연구단) ;
  • 김영호 (충남대학교 정밀응용화학과)
  • Received : 2013.08.21
  • Accepted : 2013.10.29
  • Published : 2014.02.10
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Abstract

Mesoporous SAPO-34 catalyst was successfully synthesized by the hydrothermal method using carbon nanotube (CNT) as a secondary template. The effects of CNT contents (0.5, 1.5, 2.5, and 4.5 mol%) on catalytic performances were investigated. The synthesized catalysts were characterized with XRD, SEM, nitrogen physisorption isotherm and $NH_3$-TPD. Among the synthesized catalysts, SAPO-34 catalyst prepared by the addition of 1.5 mol% CNT (1.5C-SAPO-34) observed not only the largest amounts of mesopore volume but also acid sites. However, the mesopore volume was relatively decreased by further increasing of CNT contents due to the formation of small crystalline. The catalytic lifetime and the selectivity of light olefins ($C_2{\sim}C_4$) were examined for the dimethyl ether to olefins reaction. As a result, the 1.5C-SAPO-34 catalyst showed an improvement of ca. 36% in a catalytic lifetime and a better selectivity to light olefins as compared with the general SAPO-34 catalyst.

메조 세공을 갖는 SAPO-34 촉매를 2차 주형 물질로서 탄소 나노튜브(CNT)를 이용한 수열 합성 방법에 의해 성공적으로 합성했으며, CNT 첨가량(0.5, 1.5, 2.5 및 4.5 mol%)이 촉매 성능에 미치는 영향을 조사하였다. 합성된 촉매들은 X-선 회절 분석(XRD), 주사 전자 현미경(SEM), 질소 흡탈착 등온선 및 암모니아 승온 탈착($NH_3$-TPD)을 통해 특성분석을 수행하였다. 합성된 촉매 중에서 1.5 mol% CNT를 첨가하여 제조된 SAPO-34 (1.5C-SAPO-34)가 가장 큰 메조 세공부피를 나타냈을 뿐만 아니라 총 산점의 양도 가장 높은 것으로 관찰되었다. 그러나 CNT의 함량을 그 이상 첨가하여 제조한 촉매들의 경우 결정의 크기가 너무 작아 오히려 메조 세공의 부피가 감소하는 것으로 나타났다. 제조된 촉매들의 dimethyl ether to olefins 반응에서 CNT 함량에 따른 촉매 수명과 경질 올레핀($C_2{\sim}C_4$)의 선택성을 연구하였다. 그 결과 1.5C-SAPO-34 촉매는 기존의 SAPO-34 촉매와 비교하여 더 우수한 경질 올레핀 선택도와 약 36%의 향상된 촉매수명을 나타났다.

Keywords

References

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