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The Activation of CD4 for H/D Exchange Over H-Zeolites

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Abstract

The H/D exchange was studied between CD4 and H-zeolites using pulsed a microcatalytic reactor and MS analysis. Methane-d3 was the only exchange product, while a large fraction of the reactant was retained by the zeolite. The apparent activation energies (Ea) were determined for CHD3 production assuming first-order reaction kinetics. The Ea was close to 80 kJ mol-1 over the H-ZSM-5 and H-mordenite, and about 50 kJ mol-1 over H-beta. Results suggested that, at the low methane loading applied, the H/D exchange was initiated predominantly by heterolytic dissociation of CD4 to CD3 δ- and Dδ+ over Lewis acid-Lewis base pair sites.

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Authors and Affiliations

  1. Institute of Chemistry, Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, H-1525, Budapest, Hungary

    J. Valyon, J. Engelhardt, D. Kalló & M. Hegedüs

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  1. J. Valyon
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  2. J. Engelhardt
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  3. D. Kalló
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  4. M. Hegedüs
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Valyon, J., Engelhardt, J., Kalló, D. et al. The Activation of CD4 for H/D Exchange Over H-Zeolites. Catalysis Letters 82, 29–35 (2002). https://doi.org/10.1023/A:1020579705752

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