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Received July 31, 2014
Accepted September 17, 2014
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Dealumination에 의한 NaY zeolite의 개질과 VOCs 흡착특성에 관한 연구
A Study on Dealumination of NaY Zeolite and its VOCs Adsorption Properties
한양대학교 화학공학과, 426-791 경기 안산시 상록구 한양대학로 55
Department of Chem. Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi 426-791, Korea
Korean Chemical Engineering Research, June 2015, 53(3), 339-349(11), 10.9713/kcer.2015.53.3.339 Epub 2 June 2015
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Abstract
본 연구에서는 활성탄을 대체하는 소재로서 재생이 용이하고 열적 안정성이 높은 DAY (Dealuminated Y-type) 제올라이트를 제조하였다. 원료물질로는 NaY 제올라이트를 이용하였으며, 이온교환, 소성, 수증기처리, 산처리의 단계를 거쳐 DAY 제올라이트를 제조하였다. 이때 결정성을 유지하면서 높은 Si/Al ratio를 얻기 위하여 소성 온도, 시간 및수증기 처리 시간에 변화를 주었다. 또한 제조한 DAY 제올라이트, 원료 물질인 NaY 제올라이트 및 상용 제올라이트 인 HISIV 1000에 대하여 상대습도 50%의 공기 흐름 중에서 VOCs 들에 대한 흡착 실험을 하였다. 520 oC에서 4시간 소성 및 7시간의 수증기처리를 통해 제조한 DAY 제올라이트는 결정성이 유지되었고, Si/Al ratio는 80.4이였다. 수분흡착특성은 NaY 제올라이트의 10% 정도로 소수성을 나타내었다. 상용 DAY 제올라이트인 HISIV 1000과 비교한 결과 극성이 강한 MEK에 대해서는 0.8배 정도의 흡착용량을 보였으나, 무극성이거나 극성이 약한 toluene과 EA에 대해서 각각 1.6배, 1.3배 정도 높은 흡착 용량을 보였다.
In this work, DAY (Dealuminated Y-type) zeolites were prepared to be used as easily regenerable and thermally stable adsorbent substituting activated carbon. NaY zeolites were transformed into DAY zeolites through ion exchange, calcination, steaming, and acid leaching. Calcination temperature and time, and steaming time were changed to increase the Si/Al ratio and maintain crystallinity. Adsorption of VOCs were done for prepared DAY, commercial NaY and Hisiv 1000 in air with relative humidity of 50%. The DAY zeolite prepared by calcination at 520 oC for 4 hrs and steaming for 7 hrs had a same structure and a Si/Al ratio of 80.4. Its adsorption capacity for water vapor was 10% of NaY, indicating its hydrophobicity. Its adsorption capacity for MEK was 0.8 times of Hisiv 1000, that for toluene 1.6 times, and that for EA 1.3 times.
Keywords
References
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McDaniel CV, Maher PK, “Molecular Sieves,” Soc. Chem. Ind., London, 186(1967). (1967)
Scherzer J, Bass JL, J. Catal., 28, 101 (1973)
Vedrine JC, Abou-Kais A, Massardier J, Dalmai-Imelik G, J. Catal., 29, 120 (1973)
Scherzer J, ACS Symp. Ser. Am. Chem. Soc., 248 (1984)
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Freude D, Oehme W, Schmiedel H, Staudte B, J. Catal., 32, 137 (1974)
Kliknowski J, et al., Zeolites, 3, 5 (1983)
Fejes P, Hannus I, Kirichi I, Zeolites, 4, 73 (1984)
Seo DN, “Synthesis of NaY Zeolites and Dealumination,”Ms. Thesis, Hanseo Univ., (2001). (2001)
Sherzer J, J. Catal., 54, 285 (1978)
Meininghaus CKW, Prins R, Microporous Mesoporous Mater., 35-36, 349 (2000)
