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Acknowledgment. The authors are grateful to K. Kourtakis
and G. Coulston of DuPont Central Research and Development
for synthesis of the catalyst used in these studies and for other
helpful discussions. This work was conducted through the Ames
Laboratory which is operated through the U.S. Department of
Energy by Iowa State University under contract No. W-7405-
Eng-82. Support from the Office of Basic Energy Sciences,
Chemical Sciences Division is also acknowledged.
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