Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging

Jane Y. Howe; Lawrence F. Allard; Wilbur C. Bigelow; Hendrix Demers; Steven H. Overbury

doi:10.1186/1556-276X-9-614

Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging

Jane Y. Howe, Lawrence F. Allard, Wilbur C. Bigelow, Hendrix Demers, Steven H. Overbury

Nuclear Energy Materials Microanalysis

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

By coupling techniques of simultaneous secondary (SE) and transmitted electron (TE) imaging at high resolution in a modern scanning transmission electron microscope (STEM), with the ability to heat specimens using a highly stable MEMS-based heating platform, we obtained synergistic information to clarify the behavior of catalysts during in situ thermal treatments. Au/iron oxide catalyst 'leached' to remove surface Au was heated to temperatures as high as 700°C. The Fe₂O₃ support particle structure tended to reduce to Fe₃O₄ and formed surface terraces; the formation, coalescence, and mobility of 1- to 2-nm particles on the terraces were characterized in SE, STEM-ADF, and TEM-BF modes. If combined with simultaneous nanoprobe spectroscopy, this approach will open the door to a new way of studying the kinetics of nano-scaled phenomena.

Original language	English
Article number	614
Journal	Nanoscale Research Letters
Volume	9
Issue number	1
DOIs	https://doi.org/10.1186/1556-276X-9-614
State	Published - 2014

Funding

Microscopy research at the Oak Ridge National Laboratory’s High Temperature Materials Laboratory was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office, Propulsion Materials Program. This is a contributed paper and published as part of the Proceedings of the Microscopy and Microanalysis 2010, Portland, OR, USA, August, 2010.

Funders	Funder number
US Department of Energy
Office of Energy Efficiency and Renewable Energy

Keywords

Catalyst
In situ characterization
Phase transformation
Scanning electron microscopy
Scanning transmission electron microscopy

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10.1186/1556-276X-9-614

Cite this

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Understanding catalyst behavior during in situ heating through simultaneous secondary and transmitted electron imaging

Abstract

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Keywords

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