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Coadsorption of Nitriles and Co On Cu-Zsm-5: An In Situ FTIR Spectroscopic Study

Published online by Cambridge University Press:  10 February 2011

J. Szanyi  and
M. T. Paffett
J. Szanyi
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545 LA-UR 96-1239
M. T. Paffett
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545 LA-UR 96-1239
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Abstract

The coadsorption of acetonitrile (ACN) or deuterated acetonitrile (dACN) with CO at Cu-ZSM-5 reveals several interesting features concerning the partial valency of Cu. Specifically, CO binds at Cu+1 and Cu° centers (in the absence of preadsorbed ACN) and exhibits C-O stretching frequencies of 2157 cm−1 and 2112 cm−1, respectively. Carbon monoxide readily adsorbs at an ACN (or dACN) saturated Cu-ZSM-5 and exhibits a C-O stretch of 2122 cm−1, a value more consistent with a partially reduced Cu+1 center. Furthermore, the IR cross section for the CN stretch in a number of nitriles (ACN, dACN, and benzonitrile) coadsorbed with CO displays interesting effects attributed to rehybridization and changes in CN dipole moment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 431: Symposium P – Microporous and Macroporous Materials , 1996 , 153
Copyright
Copyright © Materials Research Society 1996

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