Hydrogen oxidation catalysed by X zeolite containing transition metal ions
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 75, 314-322
- https://doi.org/10.1039/f19797500314
Abstract
The catalytic activity of X zeolite for the oxidation of 1% H2/air in a flow system was augmented by the exchange of 20% of the Na+ for transition metal ions. The kinetics were first order in H2 pressure, and from the temperature required to maintain k1= 2.0 × 1013 molecules g–1 s–1 Pa–1 the activity sequence is: Pd,HX Cu,HX > Fe,HX > Ni,HX > Cr,HX > Zn,HX > Mn,HX > Co,HX > HX. The activity of Cu,HX increased with increasing Cu2+ content but was insensitive to the proton content. Close similarities in the kinetics and energetics for catalysis on Cu,HX, CuX, CuX, CuO on SiO2/Al2O3 and for published work on Cu,HY, support Cu–O–Cu bridges as the centres of activity. Temperature programmed reduction measurements suggest that the ease of interaction of H2 with such bridges controls the pattern of catalytic activity.Keywords
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