Abstract
The H2/O2 reaction on a polycrystalline palladium foil has been studied. The experimental methods used were Laser-Induced Fluorescence (LIF) and microcalorimetry. The reaction was also simulated with the Chemkin software package. The water production maximum occurs at 40% H2 and the OH desorption has its maximum at 10% H2, at a total pressure of 100 mTorr (13 Pa) and a catalyst temperature of 1300 K. It is concluded, in agreement with the simulations, that the main water-forming reaction at these experimental conditions is OH+H→H2O. From the water production maximum the quotient of the initial sticking coefficient for hydrogen and oxygen (SH2(0)/SO2(0)) is calculated to be 0.75(±0.1).
Highlights
Catalysis is of great fundamental, practical and economic interest in today's society
The quotient SH2(0)/SO2(0) of the initial sticking coefficients for H2 and O2 can be calculated from the relative hydrogen pressure, αH2, where the production of water reaches a maximum: αH2Omax
The maximum in OH desorption occurs at αH2 = 10%, which is lower than the early results in [2], where it was measured to be αH2 = 20% at 100 mTorr
Summary
Catalysis is of great fundamental, practical and economic interest in today's society. Noble metals, such as palladium and platinum, are widely used as heterogeneous catalysts for reduction of car exhausts. The catalytic properties of platinum have been extensively studied in our group among others ([1], and references therein). We intend to further investigate the palladium metal. The OH desorption has previously been measured with LIF [2]. New in this work is that we have used an im-
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