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Crystal structure of an unusual corrosion deposit, bis(ethylammonium) tetrachloroiron(II)

Published online by Cambridge University Press:  10 January 2013

J. A. Kaduk  and
J. J. Harper
J. A. Kaduk
Affiliation:
BP Amoco p.l.c., Naperville, Illinois 60566
J. J. Harper
Affiliation:
BP Amoco p.l.c., Naperville, Illinois 60566
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Abstract

An Fe-containing deposit isolated from a commercial plant was identified by indexing its powder diffraction pattern, using the NIST Crystal Data Identification File to locate an isostructural Mn compound, and carrying out a successful Rietveld refinement. The principal phase in the deposit was confirmed to be bis(ethylammonium) tetrachloroiron(II). This compound crystallizes in the orthorhombic space group Pbca, with a=7.3291(6), b=7.2603(6), c=21.7544(8) Å, V=1157.59(14) Å, and Z=4. The structure consists of single perovskitelike layers of corner-sharing FeCl6 octahedra parallel to the ab plane, separated by bilayers of ethylammonium cations. The octahedra are tilted 4.4° with respect to the c-axis, and the layers are ruffled. The compound was apparently formed by reaction of the ethylamine corrosion inhibitor with Fe from the steel process vessel and chloride in the process stream.

Type
Research Article
Information
Powder Diffraction , Volume 14 , Issue 4 , December 1999 , pp. 261 - 266
Copyright
Copyright © Cambridge University Press 1999

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