文献类型：期刊文献

中文题名：纳米TiO_2的流化床渗氮反应

英文题名：Nitrogen Doping of Nano-TiO_2 in Fluidized Bed

作者：吴娇琦[1];丁百全[1];房鼎业[1]

机构：[1]华东理工大学化工学院,上海200237

年份：2005

卷号：31

期号：5

起止页码：575

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;EI(收录号：2005479497638);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：上海市科委纳米科技专项(0215nm049)

语种：中文

中文关键词：TiO2;光催化剂;流化康;渗氧;降解

外文关键词：titanium dioxide ; photocata｜yst ; fluidized bed ;nitrogen doping; degradation

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。
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 TiO2-xNx were prepared under different reaction conditions in hot-model reactor, including temperature, time and raw gas. Photocatalytic oxidation activities of the TiO2-xNx 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℃, 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.