Abstract
The rate of the reaction, H2+D2 → 2HD, is very rapid at −160 °C on the catalyst Cp′2Th-(CH3)2/dehydroxylated Al2O3, activated in H2+D2 and believed to contain supported Cp′2ThH+(Cp′ = η5-pentamethylcyclopentadienyl). Even at −195 °C, the turnover frequency is greater than 0.1 sec−1 at\(P_{H_2 + D_2 } = 1\) atm. Strong evidence is adduced that the exchange proceeds by a Rideal-Eley process, i.e. by a four-center transition state involving Th-H+D-D.
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Gillespie, R.D., Burwell, R.L. & Marks, T.J. Isotopic exchange between H2 and D2 by the Rideal-Eley mechanism. Catal Lett 9, 363–368 (1991). https://doi.org/10.1007/BF00764827
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DOI: https://doi.org/10.1007/BF00764827