120th General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code MAT.P-397
Subject RuO2 nanoparticles supported NaY zeolite for aerobic oxidation of benzyl alcohol: Effect of preparation methods on catalytic performances
Authors Dasom Jung, Kyungsu Na*
Department of Chemistry, Chonnam National University, Korea
Abstract RuO2 supported NaY zeolites were prepared via various pathways: (i) simultaneous crystallization of zeolite framework with RuCl3 precursor (Ru(SC)/NaY), (ii) post ion-exchange with Ru(III) cations (Ru(IE)/NaY), and (iii) post support of preformed RuO2 nanoparticles (Ru(PS)/NaY). X-ray diffraction analysis confirmed that RuO2 phase was formed on the NaY zeolite. With TEM and CO chemisorption analyses, it was confirmed that the RuO2 nanoparticles were supported inside or outside the zeolite crystals with uniform dispersion depending on the catalysts. The catalysts were tested in an aerobic oxidation of benzyl alcohol using molecular oxygen under ambient pressure condition at various temperatures. The results revealed that the catalytic performances involving turnover frequency (TOF), activation energy (Ea), rate constant and recyclability were remarkably changed depending on the catalysts. The Ru(PS)/NaY showed the highest TOF (33−48 h-1), whereas the others gave much lower TOFs (9−12 h-1). The Ru(PS)/NaY also had the highest Ea (48.39 kJ mol-1), whereas the Ru(SC)/NaY and Ru(IE)/NaY had smaller Ea values (18.58 and 24.11 kJ mol-1, respectively). Notably, the Ru(PS)/NaY gave remarkably higher pre-exponential factor of 5.22 × 105 h-1, which is about 5 orders of magnitude larger than that of the Ru(SC)/NaY (7.15 × 100 h-1). This suggests that collision between benzyl alcohol and molecular oxygen was very intensive on the Ru(PS)/NaY. The detailed results will be presented in this presentation.
E-mail jds930923@gmail.com