Abstract: The thermal and electric behavior of the "K-V" and "K-Na-V" catalyst series for SO2 oxidation has been studied in the working state by means of gas-flow differential thermal analysis (DTA), thermogravimetric analysis (TGA)and electric conductivity analysis (ECA). Changes in catalyst composition and characterization of catalyst distribution for different kinds of samples have been studied by means of X-ray diffraction(XRD) and scanning electron microscopy (SEM). From changes in catalyst behavior, as observed in different experiments, the reaction mechanism designated as "double temperature range, double vanadium complex and two step" is presented. The simplest model of the mechanism is

摘要： 本文在不同条件下,用热重(TGA)、差热(DTA)、电导(ECA)、X-射线衍射(XRD)和电子显微镜(SEM)等方法,测定和研究了钾钒系和钾钠钒系催化剂的热、电性能及活性组分的组成分布和相态变化.在此基础上讨论了SO_2在两种钒催化剂上的氧化过程,提出了双温双钒两段反应机理: