• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Surface Science >The promoting effect of CeO_2@Ce-O-P multi-core@shell structure on SO_2 tolerance for selective catalytic reduction of NO with NH_3 at low temperature
【24h】

The promoting effect of CeO_2@Ce-O-P multi-core@shell structure on SO_2 tolerance for selective catalytic reduction of NO with NH_3 at low temperature

机译：CeO_2 @ Ce-O-P多核@壳结构对SO_2耐受性的促进作用，用于低温下NH_3选择性催化还原NO

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

A series of CeO2@Ce-O-P "multi-core@shell" catalysts were synthesized in this paper for selective catalytic reduction (SCR) of NO with NH3. The experimental results had showed that CeO2@Ce-O-P-30:3 yielded best SO2 tolerance of an over 70% deNO(x) efficiency at 250 degrees C in the presence of 100 ppm SO2 for 20 h, which was much higher compared to pure Ce-O-P and CeO2 samples. Further characterization results indicated that Ce-O-P coating layer could somewhat inhibit sulfur depositing on the catalysts during SCR reaction in the presence of SO2, thereby protecting the active sites from SO2 poisoning. Especially, O-2-TPD results illustrated that a great amount of active oxygen species were retained on used CeO2@CeO-P catalyst after a long term reaction. The synergetic effect of "multi-core@shell" structure could be attributed to such enhanced performances. The "core" CeO2 devoted abundant active oxygen sites to fulfill the SCR reaction. And the "shell" Ce-O-P could not only provide acid sites, but also protect the active oxygen species by avoiding the over-adsorption of SO2 on the catalyst. This work could provide a new way to increase the sulfur resistance for low temperature SCR catalysts. (C) 2018 Elsevier B.V. All rights reserved.
机译：本文合成了一系列CeO2 @ Ce-O-P“多核@壳”催化剂，用于用NH3选择性催化还原NO。实验结果表明，CeO2 @ Ce-OP-30：3在100 ppm SO2存在下持续250 h时，在250摄氏度下产生的SO2耐受性最佳，超过70％的deNO（x）效率，远高于纯Ce-OP和CeO2样品。进一步的表征结果表明，Ce-O-P涂层可以在SO2存在下进行SCR反应过程中抑制硫沉积在催化剂上，从而保护活性部位免受SO2中毒。特别是，O-2-TPD结果表明，经过长期反应后，用过的CeO2 @ CeO-P催化剂上会保留大量的活性氧。 “多核@壳”结构的协同效应可以归因于这种增强的性能。 “核心” CeO2分配了丰富的活性氧位点来完成SCR反应。而且，“壳” Ce-O-P不仅可以提供酸性位置，而且还可以避免SO2在催化剂上的过度吸附，从而保护活性氧。这项工作可以为提高低温SCR催化剂的抗硫性提供一种新方法。 （C）2018 Elsevier B.V.保留所有权利。

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