Abstract
Additional evidence has been obtained to support the contention that there are at least two types of active sites on alumina which catalyze different types of reactions and which are quite independent of each other. Two test reactions were employed: 1-butene isomerization, and the exchange of olefinic H atoms in the butene molecules with D atoms from D 2 gas. Small amounts of adsorbed CO 2 (corresponding to coverages of less than 1.6 × 10 13 molecules/cm 2) completely eliminated the exchange reaction but had very little effect on either the absolute rate or the selectivity of the isomerization reaction. When the catalysts were exposed to comparable concentrations of SO 2, HCl, NH 3, or pyridine, at reaction temperature (~25 °C), there was no signficant effect on the rates of either isomerization or exchange. Speculation about the two types of sites for these reactions are discussed.
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