Abstract
The effects of palladium concentration profile on the selective hydrogenation of isoprene (IP) were investigated by comparing the catalytic performance of well-controlled eggshell and uniform profile catalysts. The catalytic performance test, combined with other complementary characterization techniques, provides the information for fundamental understanding of the relationship between catalyst preparation and performance. Experimental results indicate that the catalyst with an eggshell palladium profile has a higher partial hydrogenation selectivity and less coke formation. The results also indicate that the better activity maintenance for the eggshell catalyst is due to the lower tendency for coke formation from conjugated dienes polymerization. As a result, the eggshell catalyst is much more active, selective and stable than the uniform profile catalyst. In this study, the catalytic reactions were carried out at reaction conditions similar to those of a commercial run: 44°C and 30 atm. The palladium concentration profiles and particle sizes were determined by EPMA (electron probe microanalysis) and TEM (transmission electron microscopy) respectively. The coke deposited on the catalysts was characterized by DSC (differential scanning calorimetry) and the likely coke precursors were identified by GC/MS (gas chromatography/mass spectrometer) spectroscopy.
Published Version
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