Fraction of the CoMoS phases accessible to NO in Co–Mo hydrodesulfurization catalysts

It is established by using Co–Mo model sulfide catalysts, XAFS and FTIR that Co atoms constituting CoMoS phases are not oxidized by NO adsorption and that only 55% of the CoMoS phases is susceptible to NO adsorption even at the maximum coordinative unsaturation attainable under usual HDS reaction conditions (623–673 K).