CoxPy Catalysts in HDO of Phenol and Dibenzofuran: Effect of P content

Abstract

Cobalt phosphide catalysts supporting on SiO2 presenting different CoxPy stoichiometry were proved in hydrodeoxygenation (HDO) of two different model molecules present in biomass derived bio-oil such as phenol (Ph) and dibenzofuran (DBF). To investigate composition effects a series of cobalt phosphide catalysts presenting different initial P/Co atomic ratio were prepared. The catalysts were characterized by a range of techniques (N2 physisorption, XRD, TEM, NH3-TPD and XPS) and tested for DBF and Ph HDO activity and selectivity. Characterization results evidenced good textural properties, high dispersion of the active phase, as well as the presence of acid sites after P and Co incorporation. The highest activity was observed for catalysts containing an intermediate P/Co content were the CoP phase was the predominat one. Those catalyst containing Co2P or CoP2 phases were less active in these reactions.