Exchange of deuterium with OH groups of HY zeolites |
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Authors: | J Nováková L Kubelková and P Jir |
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Institution: | (1) J. Heyrovsky Institute of Physical Chemistry and Electrochemistry, CSAV, Máchova 7, 121 38 Prague 2, Czehoslovakia |
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Abstract: | The exchange reaction of D2 with OH groups of HY zeolites was followed both in the solid and gas phase by IR and MS. The rates of D2–OH and D2–H2 exchange increase considerably with dehydroxylation of the sample. The active centers are probably vacancies formed by removal of oxygen from the lattice, they catalyze the dissociation of D2. Dehydroxylation of the sample is accompanied by the formation of 3 740 cm–1 hydroxyls, whose exchange with D2 is slower than that with other OH groups and which affect the kinetics in the gas phase.
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