Abstract：The P2O5-V2O5 catalysts were prepared by using chromatography silica gel and macroporous SiO2 as carriers, respectively. The morphology and structure of the catalysts were characterized by transmittance electron microscopy (TEM), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The effects of different carriers on the catalytic performance were studied by the synthesis of methyl acrylate from methyl acetate and methylal in a fixed bed reactor. The results showed that the P2O5-V2O5 catalyst with macroporous SiO2 as carrier possessed uniformly ordered macroporous/mesoporous structure, and the active component of V2O5-P2O5/SiO2 catalyst with molar ratio of phosphor to vanadium 1.03 was (VO)2P2O7; V2O5-P2O5/SiO2 catalyst was amorphous structure with molar ratio of phosphor to vanadium was 2.60, possessing more V5+, which promoted the synergistic action of V4+ and V5+ and the aldol reaction. When molar ratio of phosphor to vanadium was 2.60, the P2O5-V2O5 catalyst with macroporous SiO2 as carrier had better catalytic performance than that with chromatography silica gel as carrier.
Song Weiming,Jing Tao,Tian Jingzhi. Preparation of Amorphous P2O5-V2O5 Multilevel Porous Structure Catalytic Materials and Its Catalytic Synthesis of Methyl Acrylate[J]. 化学反应工程与工艺, 2014, 30(6): 536-543.
