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Author

Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Tomography and High-Resolution Electron Microscopy Study of Surfaces and Porosity in a Plate-like gamma-Al2O3

Cited 10 times inthomson ciCited 8 times inthomson ci
Title
Tomography and High-Resolution Electron Microscopy Study of Surfaces and Porosity in a Plate-like gamma-Al2O3
Author
Kovarik, LiborGenc, ArdaWang, ChongminQiu, AnniePeden, Charles H. F.Szanyi, JanosKwak, Jahun
Keywords
Desorption characteristics; High-resolution imaging; Low-index surfaces; Metal particle; Nano scale; Surface characteristics; Tomographic
Issue Date
201301
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.117, no.1, pp.179 - 186
Abstract
Morphological and surface characteristics of gamma-Al2O3 are topics of high relevance in the field of catalysis. Using tomography and high-resolution transmission electron microscopy (TEM) imaging, we have studied the surface characteristics of a model gamma-Al2O3 synthesized in the shape of platelets and macroscopically defined by (110)Al2O3 and (111)Al2O3, surface facets. We show that the dominant (110)Al2O3, surface of the synthesized gamma-Al2O3 is not atomically flat but undergoes a significant reconstruction, forming nanoscale (111)Al2O3, facets. In addition to high-resolution imaging, tomographic analysis was carried out, enabling an examination of the pores/voids, which were found to be mostly enclosed within the bulk and inaccessible to gases or solvents carrying precursors for metal particles. Tomographic analysis shows that the surfaces of the pores are defined exclusively by (100)Al2O3 and (111)Al2O3 facets. The importance of these findings is discussed in the context of relative surface energies of low index surfaces and ethanol desorption characteristics.
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DOI
http://dx.doi.org/10.1021/jp306800h
ISSN
1932-7447
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