...
首页> 外文期刊>Catalysis science & technology >A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: model and supplier catalysts
【24h】

A deactivation mechanism study of phosphorus-poisoned diesel oxidation catalysts: model and supplier catalysts

机译:失活机理的研究phosphorus-poisoned柴油机氧化催化剂:模型和供应商催化剂

获取原文
获取原文并翻译 | 示例
           

摘要

The effect of phosphorus poisoning on the catalytic behavior of diesel oxidation catalysts was investigated over model and supplier monolith catalysts,i.e., Pd-Pt/Al2O3. The results of ICP and XPS from the vapor-phase poisoning over model catalysts suggested that the temperature of phosphorus poisoning affects both the overall content of phosphorus and the dispersion of phosphorus (i.e., inlet/outlet and surface/bulk). Phosphorus oxide (P2O5), metaphosphate (PO3-), and phosphate (PO43-) were identified in the poisoned model and supplier catalysts. The distribution of these species on poisoned model catalysts was highly dependent on the poisoning temperature,i.e., a higher temperature resulted in a higher concentration of PO43-. The outlets of the monoliths contained more PO(4)(3-)and less P(2)O(5)than the inlets. Both active sites and surface OH groups on model and supplier catalysts were contaminated upon phosphorus poisoning. It is found that PO(4)(3-)had a stronger influence on the active sites than P2O5. One significant finding in this study is that the vapor-phase phosphorus poisoning could be a practical and cost efficient approach to simulate an accelerated aging/poisoning process.
机译:上的磷中毒的效果柴油机氧化催化剂的催化行为研究模型和供应商庞然大物催化剂,即。和XPS从气相中毒模型催化剂建议的温度磷中毒影响整体磷和分散的内容磷(即进口/出口和表面/体积)。偏磷酸氧化磷(P2O5),(警察丙-),和磷酸(PO43 -)是确定的催化剂中毒模型和供应商。这些物种的分布在中毒模型催化剂是高度依赖于中毒温度,即。在更高浓度的PO43 -。巨石的包含更多的PO(4)(3 -)和更少P (2) O(5)的入口。催化剂表面哦组模型和供应商污染在磷中毒。发现阿宝(4)(3)有较强的影响比P2O5在活动网站。在这项研究中发现是气相磷中毒可能是实用模拟一个成本有效的方法加速老化/中毒的过程。

著录项

相似文献

  • 外文文献
  • 中文文献
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