A study of crystal structure and surface chemistry of silicalites |
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| Affiliation: | 1. Department of Physics, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University, Kampus IPB Darmaga, Bogor, West Java 16680, Indonesia;2. Department of Mechanical and Biosystem Engineering, Faculty of Agricultural Technology, Bogor Agricultural University, Kampus IPB Darmaga, Bogor, West Java 16680, Indonesia;3. Department of Physics, Graduate School of Nanoscience & Technology (WCU), KAIST Center for LED Research, and KI for the NanoCentury, KAIST, Daejeon 305-701, Republic of Korea;4. Department of Civil and Environmental Engineering, Faculty of Agricultural Technology, Bogor Agricultural University, Kampus IPB Darmaga, Bogor, West Java 16680, Indonesia;1. Gas-Phase Kinetics Research Laboratory, National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan;2. Department of Chemistry, The University of Lahore, Lahore, Pakistan;3. Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan;4. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan;1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;2. Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China;3. School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | Crystal structure and sorption properties of silicalites, a new microporous crystalline silica, have been studied. The low temperature phase transition of silicalite into α-cristobalite is detected as being promoted by alkali cations. Removal of alkali cations by acid treatment results in higher thermo-stability of the crystals (to over 1150°C) without any change in maximum sorption capacity for n-hexane. Hydroxyl modes are found to be similar between silicalite and isostructural zeolite and were spectroscopically identified (the band at 3680 cm−1) as hydrolyzed sodium-silicate bonds forming on acid treatment and washing the precursor crystals with water. |
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