Consolidation of Metal Oxide Nanocrystals. Reactive Pellets with Controllable Pore Structure That Represent a New Family of Porous, Inorganic Materials
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- 作者：Ryan Richards ; Weifeng Li ; Shawn Decker ; Chet Davidson ; Olga Koper ; Vladimir Zaikovski ; Alexander Volodin ; Thomas Rieker ; and Kenneth J. Klabunde
- 刊名：Journal of the American Chemical Society
- 出版年：2000
- 出版时间：May 24, 2000
- 年：2000
- 卷：122
- 期：20
- 页码：4921 - 4925
- 全文大小：275K
- 年卷期：v.122,no.20(May 24, 2000)
- ISSN：1520-5126
文摘
Nanocrystals of MgO (4 nm) exist as polyhedral structures with high surface concentrations ofedge/corner sites. In powder form the crystallites weakly agglomerate into porous weblike structures ofapproximately 1400 nm according to small-angle X-ray scattering. Upon consolidation of these fine powdersunder pressure, pellets can be readily prepared that maintain their high surface areas, and small crystallitesizes. In addition, large pore volumes and pore size openings can be controllably decreased with pelletizationpressure increase. The pellets retain their voracious adsorbent affinities and capacities for a wide variety oforganic molecules and acid gases. Quantitative measurements on the adsorption of a series of alcohols vspelletization pressure reveal a pattern of molecular size selectivity.