Abstract
Isopropanol decomposition has been studied over the spinel solid solutions MgAl 2 − x Cr x O 4 where x = 0 → 2. There are two zones of activity as a function of chromium content. There is an activity minimum at x = 0.4. The active sites on catalysts below x = 0.4 are thought to be electronically isolated, whereas above x = 0.4 they interact electronically. Dehydration activity is high over catalysts very dilute and very concentrated in chromium. Dehydrogenation activity seems to be favored by chromium pair sites.
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