Abstract
The hydrogenolysis of glycerol to ethylene glycol and propylene glycol represents an initial system for developing an improved mechanistic understanding of the conversion of the more complex higher polyhydric alcohols. Previous work in our lab demonstrated the effects that pH, product degradation, and competitive adsorption have on the reaction system. This work is an extension that studies the effects of temperature and sulfur loading. Batch reactor studies with ruthenium on carbon catalysts were performed at a temperature range of 205 to 240°C and sulfur loading range of 0-1.0 mol S/Ru. Previous Langmuir-Hinshelwood type models were extended to include the data. Apparent activation energies for the glycerol reaction and the glycol degradation were determined. Previous studies for this system have focused on the aqueous phase scission reactions and metal catalyzed (de)hydrogenation reactions. Analyzing the reaction flux map with and without sulfur; however, leads to the conclusion that catalytic dehydration must also be occurring on the solid catalyst.
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