コンノ　ヒロキ   Konno Hiroki   今野　大輝    所属   東邦大学  理学部 生命圏環境科学科    職種   准教授
論文種別	原著
言語種別
査読の有無	査読あり
表題	Microwave-assisted hydrothermal synthesis of submicron ZSM-22 zeolites and their applications in light olefin production
掲載誌名	正式名：Microporous and Mesoporous Materials ISSNコード：1387-1811
巻・号・頁	206(C),136-143頁
著者・共著者	Oki Muraza,Adedigba Abdul-Lateef,Teruoki Tago,Asep B.D. Nandiyanto,Hiroki Konno,Yuta Nakasaka,Zain H. Yamani,Takao Masuda
発行年月	2015/04
概要	© 2014 Elsevier Inc. All rights reserved. There is an increased demand for facile and rapid synthesis of one-dimensional pore zeolites with controlled crystal size in the nanometer range. Here, we report for the first time, the rapid synthesis of ZSM-22 (TON) by using microwave-assisted hydrothermal synthesis (MAHyS) to control nucleation and growth. ZSM-22 crystals were synthesized rapidly in 24 h (instead of 72 h in conventional synthesis). Effect of synthesis time under microwave irradiation on the crystallinity of TON zeolites from 8 to 24 h was investigated. The conventional hydrothermal synthesis was used for comparison. Under microwave-assisted synthesis, uniform crystal size with lower crystal aspect-ratio (length/width) was obtained and high agglomeration was prevented. Surface modification was applied by deposition of silica on the external surface of ZSM-22 using catalytic cracking of diphenyl silane. The protonated H-ZSM-22 prepared by the MAHyS and the surface-modified TON zeolites were applied in catalytic cracking of n-hexane. The modified MAHyS zeolites showed superior selectivity to propylene and lower selectivity to aromatics. Stability against deactivation was clearly observed over surface-modified ZSM-22 zeolites. The physico-chemical properties of modified zeolite-catalysts were characterized by using XRD, FE-SEM, N2 adsorption-desorption, 27Al MAS NMR and NH3-TPD.
DOI	10.1016/j.micromeso.2014.12.025