Correlations of Physical and Chemical Properties of Lanthanide Oxides with Catalytic Behaviors. Progress Report, September 1, 1980-August 31, 1981

摘要

Using the batch reaction/analysis system that has been described in a previous Progress Report, separate characterization of the behaviors of both La sub 2 O sub 3 and Nd sub 2 O sub 3 for ethanol decomposition have been completed. Investigation of the corresponding properties of Pr sub 2 O sub 3 for this reaction is in progress. In spite of their dissimilar cationic electronic/magnetic properties and differing surface basicities, the catalytic behaviors of La sub 2 O sub 3 and Nd sub 2 O sub 3 are virtually identical in all respects for both dehydration and dehydrogenation pathways of the alcohol conversion. This similarity involves not only their initial activity/selectivity parameters, but also their responses to variations in catalyst preparation/pretreatment conditions, crystallographic phase, and poisoning of the differnt kinds of catalytic sites. Preliminary results for Pr sub 2 O sub 3 indicate that its behavior also closely resembles those of La sub 2 O sub 3 and Nd sub 2 O sub 3 . Detailed discussions of the dehydration and dehydrogenation pathways are presented in this report. (ERA citation 06:019024)