Abstract
The characterization of cobalt molybdenum nitrides with various cobalt contents has been studied using XRD, TEM, XPS, and temperature-programmed reactions with NH3. The hydrodesulfurization of thiophene on the cobalt molybdenum nitride was carried out using a differential microreactor at atmospheric pressure. The XRD analysis of Co(50)973 indicated that Co3Mo3N was formed from the nitriding of a CoMoO4 precursor prepared from Co(NO3)2·6H2O and (NH4)6Mo7O24·4H2O but not from the mixture of CoO and MoO3. Co(10−25)973 had a high surface area of 120−129 m2 g-1, but Co(50)973 had that of 12 m2 g-1. The BET surface area was related to the molybdenum ions (Mo2+ and Mo3+) and cobalt ion (Co3+) in the bulk sample. The XPS and elemental analyses of Co(50)973 showed that the bulk composition was Co3Mo3N·N0.2 and the surface composition was Co3Mo3N·N2. The cobalt molybdenum nitride Co(0−35)973 was more active than cobalt molybdenum sulfide on basis of catalyst weight in the hydrodesulfurization of thiophene at 623 K.
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