【摘要】 研究了气固流化床中T iO2渗氮反应的工艺条件。通过小型冷模实验比较了不同气速下包裹型纳米T iO2床层的流化状态和膨胀情况,依据流化情况选择了操作空速;通过热模实验在不同反应温度、反应时间、反应气体等工艺条件下进行了渗氮反应,测试了产品T iO2-xNx对SO2的气相降解率,并进行了XRD,UV-V is分析,据此得到较佳的反应温度为400°C、而反应时间与气体组成对反应的影响不大,并根据XPS结果推测了渗氮机理。更多还原

【Abstract】 The technology of nitrogen-doped reaction in gas-solid fluidized bed has been studied.The fluidized and expanding conditions under various gas velocities were compared in small-scale cold-model （reactor） to choose a proper gas velocity,and a series of TiO_2-xN_x were prepared under different reaction conditions in hot-model reactor,including temperature,time and raw gas.Photocatalytic oxidation activities of the TiO_2-xN_x powders were evaluated by the decomposition of gaseous SO₂ under visible and ultraviolet light irradiations and XRD（X-ray diffraction）.The most proper reaction temperature was 400（°C）,and（reaction） time and gas composition had little effects.The mechanism of the nitrogen doping was also（presumed） according to the XPS（X-ray photoelectron spectroscopy） results.更多还原