MoP with rich species generated via radio frequency thermal plasma for higher alcohols synthesis from syngas

Abstract

In this paper, the molybdenum phosphide (MoP) catalysts (TPR-MoP and TPR-MoP-Pla) were prepared by the traditional method and the RF (radio frequency) thermal plasma technique respectively and characterized by x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), hydrogen temperature-programmed desorption (H 2 -TPD) and carbon monoxide temperature-programmed desorption (CO-TPD) measurements, and their catalytic performance for HAS was evaluated. The results showed that the total and C 2+ alcohols selectivity of the catalyst after plasma treatment (TPR-MoP-Pla) were enhanced. The enhanced catalytic performance could be related to more dislocation defects and the synergistic effect between Mo 0-2+ and Mo 4+ valence species in the TPR-MoP-Pla catalyst. In addition, this work suggests that thermal plasma treatment can be used as a new preparation technique for the synthesis of materials with rich species.

Development of a unique Niδ+ (0 < δ < 2) in NiMoP/Al2O3 catalyst for dry reforming of methane

“…[23][24][25] In the case of 9.74NiMoP sample, the binding energy peaks of oxidized Mo (229.9 eV), Mo (232.8 eV), Ni (856.6 eV) and P (133.9 eV) were accordant with assignments by others to Mo 4+ , Mo 6+ , Ni 2+ and P 5+ species, 25,26 respectively. And the binding energy peaks at 228.2, 853.3 and 129.5 eV were attributed to Mo σ+ (Mo-P), Ni δ+ (Ni-P) and P α− (Mo(Ni)-P) species, [27][28][29] respectively. The binding energy of Ni 2p 3/2 at 853.3 eV was higher than that assigned to Ni 0 (852.6 eV) 30 but lower than that assigned to Ni 2+ (856.6 eV).…”