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The surface nature of fresh Mo_2N/Al_2O_3,Mo_2C/Al_2O_3 and M0P/Al_2O_3 catalysts,which were synthesized directly in the IR cell to avoid passivation,were characterized by in situ IR spectroscopy with CO as a probe molecule. CO adsorbed on fresh catalysts showed characteristic IR bands at 2045 cm~(-1) for Mo_2N/Al_2O_3 catalyst,2054 cm~(-1) for Mo_2C/Al_2O_3 catalyst and 2037 cm~(-1) for MoP/Al_2O_3 catalyst,respectively.A strong band at 2200 cm~(-1) for Mo_2N/Al_2O_3 catalyst,which could be ascribed to NCO species formed when CO reacted upon surface active nitrogen atoms,and a weak band at 2196 cm~(-1) for Mo_2C/Al_2O_3 catalyst,which could be attributed to CCO species,were also detected.CO adsorbed on fresh Mo_2N/Al_2O_3 catalyst,Mo_2C/Al_2O_3 catalyst and MoP/Al_2O_3 catalyst,showed strong molecular adsorption,just like noble metals.Our experimental results are bolstered by direct IR evidence demonstrating the similarity in surface electronic property between the fresh Mo_2N/Al_2O_3,Mo_2C/Al_2O_3 and MoP/Al_2O_3 catalysts and noble metals.
The surface nature of fresh Mo_2N / Al_2O_3, Mo_2C / Al_2O_3 and MOP / Al_2O_3 catalysts, which were synthesized directly in the IR cell to avoid passivation, were characterized by in situ IR spectroscopy with CO as a probe molecule. CO adsorbed on fresh catalysts showed characteristic IR bands at 2045 cm -1 for Mo_2N / Al_2O_3 catalyst, 2054 cm -1 for Mo_2C / Al_2O_3 catalyst and 2037 cm -1 for MoP / Al_2O_3 catalyst, respectively.A strong band at 2200 cm ~ (-1) for Mo_2N / Al_2O_3 catalyst, which could be ascribed to NCO species formed when reacting with surface active nitrogen atoms, and a weak band at 2196 cm -1 for Mo_2C / Al_2O_3 catalyst, which could be Attributed to CCO species, also also detected. CO adsorbed on fresh Mo_2N / Al_2O_3 catalyst, Mo_2C / Al_2O_3 catalyst and MoP / Al_2O_3 catalyst, showed strong molecular adsorption, just like noble metals. Our experimental results are bolstered by direct IR evidence demonstrating the similarity in surface electronic property between the fresh Mo_2N / Al_2O_3 , Mo_2C / Al_2O_3 and MoP / Al_2O_3 catalysts and noble metals.