Ammonia decomposition on Co/Mo(112) model surface∗

Abstract

As a model surface of Co-Mo alloy catalysts for ammonia decomposition, Co deposited Mo(112) surface has been investigated by XPS, UPS, LEED, and kinetic measurement using a high-pressure reactor. Co deposition on Mo(112) surface followed by annealing at 1000 K shows a (1×1) LEED pattern with the split along the [¯1¯11] direction and a characteristic emission at −2.9 eV for Co-Mo d-band hybridization. The decomposition of ammonia on Co/Mo(112) surface proceeds accompanied by nitride formation. The reaction rate exhibits half order dependence on ammonia pressure with an activation energy of 101 kJ/mol, which is in good agreement with the results on alumina supported Co-Mo alloy catalysts. [DOI: 10.1380/ejssnt.2018.115]