화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.17, No.1, 130-137, January, 2011
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Optimization of key parameters for effective vanadium substitution into cubic SBA-16 in the presence of co-surfactant at low acidity: Application in the selective oxidation of ethylbenzene
B. Rabindran Jermy1, 2, S.Y. Kim1, D.K. Kim1, and D.W. Park1, †
  • 1Division of Chemical Engineering, Pusan National University, Busan 609-735, Republic of Korea
  • 2Center for Refining and Petrochemicals, King Fahd University of Petroleum and Refining, Dhahran 31261, Saudi Arabia
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Highly ordered three-dimensional V-SBA-16 materials were prepared at mild acidic condition by tuning the key parameters for metal substitution such as molar ratio of silica to 1-butanol (TEOS/BuOH), water to hydrochloric acid (H2O/HCl ratio) and hydrothermal aging time in the initial gel containing 0.0035 F127/0.01 V/0.91-2.00 TEOS/2.08-0.76 BuOH/0.70-1.16 HCl/118.6-120.1 H2O. The extent of mesopore structural ordering was confirmed by small-angle X-ray scattering and nitrogen adsorption isotherms. The presence of incorporated vanadium in a highly dispersed tetrahedral state was confirmed by electron spin resonance (ESR) and Drs-UV spectroscopy. The NH3-TPD profile showed that the materials tend to posses medium-acidic V-OH sites; strong-acidic sites increased with decreasing Si/V ratios. TEM analysis shows that the cubic phase was stable up to 3.6 wt.% vanadium loading. The activity of V-SBA-16 was tested for the selective oxidation of ethylbenzene to acetophenone by studying the effect of temperatures, time on stream, and the mole ratio of ethylbenzene to TBHP.
Keywords:SBA-16;Three-dimensional;Vanadium;Oxidation
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