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Unveiling Novel Reaction Processes in Catalysis by Environmentalhrem (EHREM)

Published online by Cambridge University Press:  02 July 2020

Pratibha L. Gai
Pratibha L. Gai*
Affiliation:
Central Research & Development, Science & Engineering Laboratories, DuPont, Experimental Station, Wilmington, DE19880-0356, USA.
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Extract

Dynamic interactions between gas molecule and solid surfaces are central to heterogeneous catalytic processes. Recently, we have developed a novel in-situ environmental high resolution electron microscopy (EHREM) method, capable of probing live gas-catalyst reactions at elevated temperatures directly (in-situ) on the atomic scale1. A Philips CM30 (S)TEM has been modified with an integrated environmental cell maintaining atomic resolution in controlled gas environments, upto ∼ 1000 °C. Using this method, we have studied important real-life catalysts, vanadyl pyrophosphates ((VO)2P2O7, hereafter referred to as VPO), used in n-butane oxidation to maleic anhydride (MA with end uses in furans.

The catalyst samples were prepared using V2O5, anhydrous phosphoric acid in isobutyl alcohol and benzyl alcohol followed by calcination and activation. VPO is orthorhombic with a ∼ 16.59Å, b ∼ 7.76Å and c ∼ 9.58 Å . An EHREM lattice image of the fresh catalyst with electron diffraction (ED) and ‘rose’ morphology, is shown in Fig 1(a).

Type
In Situ Studies in Microscopy
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 617 - 618
Copyright
Copyright © Microscopy Society of America 1997

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References

Boyes, E.D. and Gai, P.L., Ultramicroscopy, 1997 (in press).Google Scholar
Miquel, P. F., Bordes, E., Katz, J.: J. Solid St Chem. 124, 1, 1996.10.1006/jssc.1996.0212CrossRefGoogle Scholar
Gai, P.L., Kourtakis, K., Coulson, D.R. and Sonnichsen, G. in: Catal.for High Temp. Processes, Editors: Ramesh, K.S., Misono, M. and Gai, P.L. : American Ceramic Society, 1997.Google Scholar
Gai, P.L. Acta Cryst. 1997 (in press).Google Scholar
The author gratefully acknowledges technical support from Smith, D.L.Hanna, L.G. and Gooding, F.G..Google Scholar