| 학회 |
한국화학공학회 |
| 학술대회 |
2012년 가을 (10/24 ~ 10/26, 부산 BEXCO) |
| 권호 |
18권 2호, p.2429 |
| 발표분야 |
촉매 및 반응공학 |
| 제목 |
Formation Pathway for LTA Zeolite Crystals in an Organic-Inorganic Hybrid System |
| 초록 |
Despite the great success that zeolites, with channel and cavities of molecular dimensions, have had as industrial adsorbents, ion-exchangers, and catalysts, understanding how they nucleate and grow remains one of the most challenging issues in modern zeolite science. These highly porous crystals are metastable in nature, so their wide structural diversity must rely on the nucleation process which determines the phase selectivity of the crystallization. Here we show that the nucleation of high-silica LTA zeolite in the presence of both organic and inorganic structure-directing agents begins with the formation of lta-cages rather than notably smaller sod- and d4r-cages in the solid phase. We also report that sod-cages are first built around the preorganized lta-cage and d4r-cages in turn constructed by the progressive addition of low molecular weight (alumino)silicate species, which promotes the formation and growth of embryonic LTA zeolite crystals at a higher Si/Al ratio. |
| 저자 |
박민범1, 이유림1, Anmin Zheng2, Feng-Shou Xiao3, Christopher P. Nicholas4, Gregory J. Lewis4, 홍석봉1
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| 소속 |
1포항공과대, 2Chinese Academy of Science, 3Zhejiang Univ., 4UOP LLC |
| 키워드 |
crystal growth; solid-state NMR; zeolites
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| E-Mail |
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| 원문파일 |
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