ISSN:
1572-879X
Keywords:
Hydrogen isotope exchange
;
zeolite isotope exchange
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Mass spectrometry and FTIR were employed to monitor the isotopic exchange of various types of zeolite protons with D2 at 21 °C. Discrete groups of protons are differentiated by their exchange kinetics. Protons in close vicinity to Pd particles are exchanged as rapidly as H atoms, adsorbed on Pd. For more remote protons, the interchange of O-H and O-D groups follows first order kinetics, but the rate constant is lower for protons in sodalite cages than for those in supercages; the rates are higher for Pd/HY than for Pd/NaHY. Proton exchange is virtually absent for samples which were reduced at 500 °C for several hours, suggesting that the location of Pd inside zeolite cages is essential and that hydrogen spillover is irrelevant.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00764743
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