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Received December 29, 2010
Accepted February 21, 2011
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피페리딘 구조유도분자를 이용한 알루미노포스페이트 제올라이트 합성: 피페리딘 구조유도분자가 결정구조 형성에 미치는 영향
Synthesis of Aluminophosphate using Structure Directing Agent containing Piperidine Moiety: Effect of SDA on Crystal Structure
전남대학교 응용화학공학부, 500-757 광주광역시 북구 용봉동 300
School of Applied Chemical Engineering and the Institute of Catalysis Research, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Korea
sjcho@chonnam.ac.kr
Korean Chemical Engineering Research, October 2011, 49(5), 657-663(7), NONE Epub 30 September 2011
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Abstract
피페리딘 구조가 포함된 구조유도분자가 미치는 알루미노포스페이트 제올라이트 합성과 결정구조에 대한 영향을 조사하였다. 피페리딘 구조가 포함된 구조 유도분자는 피페리딘을 포함하여 2-메틸피페리딘, 2,6-디메틸피페리딘, 2,2,6,6-테트라메틸피페리딘을 사용하였다. 제올라이트 합성은 1.0Al2O3:1.0P2O5:0.76SDA:45H2O의 조성으로 170 ℃에서 7일 동안 수열합성을 하였다. 피페리딘을 구조유도분자로 사용한 경우, 층상 구조가 형성되었으며 구조유도분자의 크기가 커질수록 AFI 구조의 AlPO-5가 형성되고 가장 큰 구조 유도분자를 이용한 경우, SAS 구조의 알루미노포스페이트가 형성됨을 리트벨트법으로 확인할 수 있었다. 또한 고체핵자기공명분석법의 결과로부터 미세 다공성 물질인 SAS 골격 구조 내에 알루미늄과 인이 위치함을 알 수 있었다.
Structure directing agent(SDA) containing piperidine moiety such as piperidine(PI), 2-methylpiperidine (MPI), 2,6-dimethylpiperidine(DMPI) and 2,2,6,6,-tetramethylpiperidine(TMPI), respectively has been utilized to synthesize aluminophosphate zeolite using hydrothermal method. The gel composition was 1.0Al2O3:1.0P2O5:0.76SDA:45H2O and the hydrothermal heating was performed in an oven at 443 K and for 7 days at static mode. The obtained zeolitic material contained a lamellar structure when PI was used as the SDA. With a progressive increase of the SDA size, various structures of aluminophosphate including AlPO-5 of AFI structure were obtained. The aluminophosphate of SAS structure was formed when the largest TMPI was utilized as the SDA, which was confirmed by the Rietveld refinement. The result of 27Al and 31P MAS NMR of the sample suggested that Al and P were incorporated into the framework of the aluminophosphate.
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