Effect of various inorganic cations (Li,Na, K and Cs) and silica sources on the synthesis of the silica analogue of zeolite NCL-1 (Si-NCL-1) |
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| Institution: | 1. Division of Haematology, Department of Internal Medicine, Ohio State University James Comprehensive Cancer Center, Columbus, OH 43210, USA;1. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan;2. Aichi Center for Industry and Science Technology, 1267-1 Akiai, Yakusa-cho, Toyota 470-0356, Japan;3. Research Center for Compact Chemical Systems, National Institute of Advanced Industrial Science and Technology, 4-2-1 Miyagino-ku, Sendai 983-8551, Japan;4. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;5. Unizeo Co., Ltd., 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;1. College of Pharmacy, Pharmacology and Toxicology Department, King Saud University, Riyadh, Saudi Arabia;2. College of Pharmacy, Undergraduate Student, Ain Shams University, Cairo, Egypt;3. College of Pharmacy, Pharmacology and Toxicology Department, Al-Azhar University, Cairo, Egypt |
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| Abstract: | The role of various inorganic cations such as Li, Na, K and Cs has been studied in the hydrothermal synthesis of the silica polymorph of zeolite NCL-1 (Si-NCL-1). The crystallization time decreases in the order (Cs + Na) > K > Na> (Li + Na) under otherwise identical gel composition and crystallization conditions. Further, the synthesis has been standardized using different silica sources including various fumed silicas with different surface area and particle size, through optimizing the OH−/Si molar ratio by adding the required amount of alkali hydroxide in the synthesis gel. Among different silica sources (fumed silicas, tetraethyl orthosilicate, silica sol etc.), fumed silicas with smaller particles (~0.007 μn) like Sigma S-5005, S-5130, and Cab-O-Sil-M5 were found to be quite effective and preferable for the synthesis of Si-NCL-1 molecular sieves. These materials were characterized through XRD, IR, SEM, sorption and surface area measurements. |
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