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Solid-state 27Al Nuclear Magnetic Resonance Investigation of Plasma-facilitated NOx Reduction Catalysts

Published online by Cambridge University Press:  31 January 2011

Li-Qiong Wang ,
Christopher L. Aardahl ,
Kenneth G. Rappé ,
Diana N. Tran ,
Marisol A. Delgado  and
Craig F. Habeger
Li-Qiong Wang*
Affiliation:
Pacific Northwest National Laboratory, Box 999, MS K2–44, Richland, Washington 99352
Christopher L. Aardahl
Affiliation:
Pacific Northwest National Laboratory, Box 999, MS K2–44, Richland, Washington 99352
Kenneth G. Rappé
Affiliation:
Pacific Northwest National Laboratory, Box 999, MS K2–44, Richland, Washington 99352
Diana N. Tran
Affiliation:
Pacific Northwest National Laboratory, Box 999, MS K2–44, Richland, Washington 99352
Marisol A. Delgado
Affiliation:
Pacific Northwest National Laboratory, Box 999, MS K2–44, Richland, Washington 99352
Craig F. Habeger
Affiliation:
Caterpillar Inc., Technical Center E/854, PO Box 1875, Peoria, Illinois 61656
*
a)Address all correspondence to this author.
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Abstract

Aluminum coordination distribution for alumina catalysts supported on mesoporous silica was examined. It was shown that aluminum coordination correlates to activity of the catalysts for plasma-enhanced, selective catalytic reduction of NOx with propene. Catalysts were prepared by incorporating aluminum onto the surface of a mesoporous silica support via three different post-synthesis routes to produce varying aluminum coordination. Aluminum trichloride, sodium aluminate, and aluminum isopropoxide precursors were examined. High-resolution, solid state 27Al nuclear magnetic resonance was used to determine aluminum coordination distributions for the resulting catalysts. Unsaturated aluminum sites (i.e., structural defects) correlated with increased activity at high temperatures while tetrahedrally-coordinated aluminum or BrØnsted acid sites correlated with activity at low temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 7 , July 2002 , pp. 1843 - 1848
Copyright
Copyright © Materials Research Society 2002

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