...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Enhanced Photocatalytic Performance of Titania-Based Binary Metal Oxides: TiO_2/SiO_2 and TiO_2/ZrO_2
【24h】

Enhanced Photocatalytic Performance of Titania-Based Binary Metal Oxides: TiO_2/SiO_2 and TiO_2/ZrO_2

机译：钛基二元金属氧化物TiO_2 / SiO_2和TiO_2 / ZrO_2的光催化性能增强

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sol-gel prepared mixtures of silica or zirconia with titania are shown to have significantly higher activities than pure titania for the complete photo catalytic oxidation of ethylene. These higher activities are only apparent when the respective catalysts are stabilized by sintering. The differences become even more pronounced when the catalysts are used in a tubular reactor. Optimum mixture concentrations are found to be 12 wt% zirconia and 16 wt% silica in titania. Both catalyst types exhibit activity maxima with respect to sintering temperature. It is hypothesized that the maxima arise from opposing effects of den-sification and phase transformation versus beneficial sintering. A comparison of our catalyst compositions with literature in this area suggests that the increase in activity due to the addition of silica or zirconia may be a result of higher surface acidity. However, isoelectric point measurements employing the un-sintered and sintered catalysts show no conclusive increase in surface acidity. The effects of sintering temperature on the surface area, porosity, and crystal structure of the catalysts are also presented.
机译：溶胶或凝胶制备的二氧化硅或氧化锆与二氧化钛的混合物显示出比纯二氧化钛显着更高的乙烯完全光催化氧化活性。这些较高的活性仅在通过烧结使各个催化剂稳定时才明显。当在管式反应器中使用催化剂时，差异变得更加明显。发现在二氧化钛中最佳混合物浓度为12重量％的氧化锆和16重量％的二氧化硅。两种催化剂类型都表现出相对于烧结温度的最大活性。假设最大值是由密实化和相变相对于有益烧结的相反作用引起的。将我们的催化剂组合物与该领域的文献进行比较表明，由于添加了二氧化硅或氧化锆而导致的活性增加可能是表面酸度较高的结果。然而，使用未烧结和烧结的催化剂的等电点测量显示表面酸性没有确定的增加。还介绍了烧结温度对催化剂的表面积，孔隙率和晶体结构的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号