Synergistic role of Co and CoP on highly dispersed cobalt nanoparticles embeded in porous carbon for efficient PH3 decomposition

Efficient resourceful treatment of phosphine tail gas is a huge challenge. In this study, a series of cobalt nanoparticles embeded in porous carbon (Co@C) catalysts were obtained via pyrolysis of Co-based MOF as precursor for catalytic decomposition of phosphine (PH 3 ) by regulating the ratio of reactants of MOFs. The composition, morphology and structure of the catalysts were characterized by inductively coupled plasma, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and BET measurement. The effect of Co@C catalysts with different reactant ratio on the catalytic decomposition of PH 3 was tested, and the catalysts before and after the reaction were compared. It was found that the catalyst with MOF as the precursor after pyrolysis can still retain the porosity and large specific surface area of MOF. The metal cobalt nanoparticles and its oxides can be uniformly distributed in time under high loading, which is conducive to the reaction with phosphine to form metal phosphide (CoP), and the rapid and efficient decomposition of PH 3 was completed under the synergistic effect of the two kinds of active sites of Co and CoP. The best catalytic decomposition efficiency is Co@C-5 catalyst, which can achieve 100 % decomposition efficiency at 350 degrees C and has good stability.