Consolidation of metal oxide nanocrystals. Reactive pellets with controllable pore structure that represent a new family of porous, inorganic materials

Citation
R. Richards et al., Consolidation of metal oxide nanocrystals. Reactive pellets with controllable pore structure that represent a new family of porous, inorganic materials, J AM CHEM S, 122(20), 2000, pp. 4921-4925
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry & Analysis",Chemistry
Journal title
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
ISSN journal
0002-7863 → ACNP
Volume
122
Issue
20
Year of publication
2000
Pages
4921 - 4925
Database
ISI
SICI code
0002-7863(20000524)122:20<4921:COMONR>2.0.ZU;2-8
Abstract
Nanocrystals of MgO (4 nm) exist as polyhedral structures with high surface concentrations of edge/corner sites. In powder form the crystallites weakl y agglomerate into porous weblike structures of approximately 1400 nm accor ding to small-angle X-ray scattering. Upon consolidation of these fine powd ers under pressure, pellets can be readily prepared that maintain their hig h surface areas, and small crystallite sizes. In addition, large pore volum es and pore size openings can be controllably decreased with pelletization pressure increase. The pellets retain their voracious adsorbent affinities and capacities for a wide variety of organic molecules and acid gases. Quan titative measurements on the adsorption of a series of alcohols vs pelletiz ation pressure reveal a pattern of molecular size selectivity.