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Issue
Korean Chemical Engineering Research,
Vol.47, No.5, 608-614, 2009
루테늄이 치환된 SBA-15(Ru-SBA-15)의 질소 및 산소 흡착 거동
Nitrogen and Oxygen Sorption Behaviors of Ruthenium-Substituted SBA 15(Ru-SBA-15)
서윤아, 김형국, 신정훈, 김일, 하창식
본 연구에서는, 비이온성 삼원공중합체 계면활성제인 EO20PO70EO20를 주형으로 사용해, 다양한 Si/Ru 몰 비의 루테늄이 치환된 SBA-15들(Ru-SBA-15)을 합성하였다. 촉매 또는 선택적 흡착제 등으로써의 응용가능성을 검토하기 위해 Ru-SBA-15의 질소 또는 산소 흡착/탈착 거동을 조사하였다. Ru-SBA-15의 기공 크기는 Barrett-Joyner-Halenda(BJH) 및 Broekhoff-de Boer/Frenkel-Halsey-Hill isotherm(BdB-FHH) 방법(D(BdB-FHH))을 이용하여 결정하였다. Si/Ru 비율이 50/1인 Ru-SBA 15의 D(BJH)와 D(Bdb-FHH)는 각각 3.9, 4.7 nm였다. 투과전자현미경(TEM) 관찰에 의해 Si/Ru의 몰비율이 50인 Ru-SBA 15의 기공 크기는 4.7 nm로 나타났고, 이것은 BdB-FHH 방법을 사용한 N2 흡착 결과와 일치하였다. 산소 흡착/탈착 등온선으로부터 얻은 Brunauer-Emmett-Teller(BET) 기공 표면적은 질소의 흡착/탈착 등온선으로부터의 기공 표면적보다 높았는데, 각각 612.7 m2/g, 그리고 573.3 m2/g이었다. X선 회절(XRD) 패턴과 TEM 분석에 의해 본 연구에서 합성한 Ru-SBA-15는 잘 정렬된 육방정계 정렬을 가지는 것을 알 수 있었다.
In this work, ruthenium substituted SBA-15’s(Ru-SBA15’s) of various Si/Ru ratios were prepared using a non-ionic triblock copolymer surfactant, EO20PO70EO20, as template. We investigated the nitrogen or oxygen adsorption/desorption behaviors of the Ru-SBA-15’s for their future applications as catalysts or selective adsorbents, etc. The pore size of the Ru-SBA-15’s was determined by both the Barrett-Joyner-Halenda(BJH)(D(BJH)) and the Broekhoff-de Boer analysis with a Frenkel-Halsey-Hill isotherm(BdB-FFF) method(D(BdB-FHH)). The D(BJH) and D(BdB-FHH) of the Ru-SBA-15 having 50/1 ratio of Si/Ru were 3.9 nm and 4.7 nm, respectively. The transmission electron microscope(TEM) image of the Ru-SBA 15 of the Si/Ru mole ratio of 50 showed that the pore size is 4.7 nm, which is consistent with the N2 adsorption results with the BdB-FHH method. The surface area of pores form oxygen adsorption/desorption isotherm was higher than that from the nitrogen adsorption/desorption isotherm by the Brunauer-Emmett-Teller(BET) method, which were respectively 612.7 m2/g, and 573.3 m2/g. X-ray diffraction(XRD) patterns and TEM analyses showed that the mesoporous materials possess well-ordered hexagonal arrays.
Keywords: Mesoporous Materials; SBA-15; Ruthenium; Nitrogen; Oxygen; Adsorption-Desorption Behavior
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