AMMONIA SYNTHESIS ON SURFACE LAYERS OF MOLYBDENUM NITRIDE By

Abstract

The rate of ammonia synthesis on molybdenum Mo and its interstitial alloys, molyb-denum carbide M02C and oxycarbide MoOxCy was measured in a flow system with simul-taneous gravimetric determination of the nitrogen uptake of the catalysts. On prereduced MozC and MoOxC y the activity went up with time and reached a steady-state value when the catalyst had taken up about one monolayer of nitrogen, corresponding to a stoichiometry of MoN. On Mo the steady-state was reached after take-up of the same monolayer of MoN plus two layers of MozN. In all three cases the steady-state rates were found to be very similar. The small amounts of N taken up to reach similar rates suggest that the catalysis on metals involves localized surface orbitals

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oai:CiteSeerX.psu:10.1.1.920.357Last time updated on 11/1/2017

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