Tuesday, 24 May 2005 - 4:55 PM

This presentation is part of: Surface and Interface Science II

TPR and TEM Study of the Reduction of Cobalt-Silica Catalyst Precursors

Roger Barth, West Chester University, West Chester, PA

The reduction of silica-supported cobalt catalyst precursors is strongly influenced by the interaction of the precursor oxide with the silica support. In previously published work we showed that a fraction of the cobalt is permanently deactivated by support interactions, and that the catalytic activity was due to the cobalt in excess a threshold amount. If the cobalt was applied in two steps instead of all at once, more cobalt was deactivated. In this work, we study the reduction process by temperature programmed reduction (TPR), transmission electron microscopy (TEM), and selected area electron diffraction (SAD) in an effort to determine how a sample prepared in two steps differs from one prepared in a single step. The work has potential implications for many nanostructural materials prepared by reaction of a supported precursor.

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