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Chemical Composition,surface distribution of the elements and crystal structure offresh and deactivated Ag_xSb_yO_z/SiO_2 catalysts were investigated investigated by X-ray photoelectronspectroscopy(XPS),scanning Auger microprobc(SAM),electron microdiffraction(EMD)and atomic absorption spectroscopy(AAS).From the experimental results that in-clude the activity evaluation of model catalyst Sb_2O_4/SiO_2 Which Shows the inertness ofSb_2O_4 in Prins reaction,it is reasonable to infer that the active phase ofAg_xSb_yO_z/SiO_2 catalyst for Prins condensation reaction seems to be cubic AgSbO_3.Thereason of the deactivation of the catalyst was discussed.It is suggested that silver componentseems to be unstable in this catalyst.
Chemical Composition, surface distribution of the elements and crystal structure offresh and deactivated Ag_xSb_yO_z / SiO_2 catalysts were investigated by X-ray photoelectronspectroscopy (XPS), scanning Auger microprobc (SAM), electron microdiffraction (EMD) and atomic absorption spectroscopy (AAS). From the experimental results that in-clude the activity evaluation of model catalyst Sb_2O_4 / SiO_2 Which Shows the inertness of Sb_2O_4 in Prins reaction, it is reasonable to infer that the active phase of Ag_xSb_yO_z / SiO_2 catalyst for Prins condensation reaction seems to be cubic AgSbO_3.Thereason of the deactivation of the catalyst was discussed. It is suggested that silver componentseems to be unstable in this catalyst.