The Inhibition of propane oxidation by nitric oxide on a Pt/SiO₂ catalyst
- Chambers, Dean C
- Cant, Noel W
DOIAbstract
The effect of nitric oxide on the oxidation of alkanes over Pt/SiO₂ under stoichiometric conditions has been investigated. With propane, 1000 ppm NO lowers the rate by a factor of more than 20 and the effect remains substantial with <1 ppm of NO. The response to the introduction and removal of NO is near instantaneous. Nitric oxide is very weakly adsorbed with ~0.03% coverage under reaction conditions with 1 ppm NO present. Some NO₂ is formed concurrently with alkane oxidation and the oxidation of propane is much slower with NO₂ than with a NO/O₂ mixture. Inhibition by trace NO is best explained in terms of the repeated oxidation of NO to NO₂ and subsequent NO₂ dissociation which induces filling of the empty sites required for alkane oxidat...
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