• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Cerium and tin oxides anchored onto reduced graphene oxide for selective catalytic reduction of NO with NH3 at low temperatures
【24h】

Cerium and tin oxides anchored onto reduced graphene oxide for selective catalytic reduction of NO with NH3 at low temperatures

机译：铈和锡氧化物固定在还原的氧化石墨烯上，用于在低温下用NH3选择性催化还原NO

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A series of cerium and tin oxides anchored on reduced graphene oxide (CeO _(2) –SnO _( x ) /rGO) catalysts are synthesized using a hydrothermal method and their catalytic activities are investigated by selective catalytic reduction (SCR) of NO with NH _(3) in the temperature range of 120–280 °C. The results indicate that the CeO _(2) –SnO _( x ) /rGO catalyst shows high SCR activity and high selectivity to N _(2) in the temperature range of 120–280 °C. The catalyst with a mass ratio of (Ce + Sn)/GO = 3.9 exhibits NO conversion of about 86% at 160 °C, above 97% NO conversion at temperatures of 200–280 °C and higher than 95% N _(2) selectivity at 120–280 °C. In addition, the catalyst presents a certain SO _(2) resistance. It is found that the highly dispersed CeO _(2) nanoparticles are deposited on the surface of rGO nanosheets, because of the incorporation of Sn ~(4+) into the lattice of CeO _(2) . The mesoporous structures of the CeO _(2) –SnO _( x ) /rGO catalyst provides a large specific surface area and more active sites for facilitating the adsorption of reactant species, leading to high SCR activity. More importantly, the synergistic interaction between cerium and tin oxides is responsible for the excellent SCR activity, which results in a higher ratio of Ce ~(3+) /(Ce ~(3+) + Ce ~(4+) ), higher concentrations of surface chemisorbed oxygen and oxygen vacancies, more strong acid sites and stronger acid strength on the surface of the CeSn(3.9)/rGO catalyst.
机译：利用水热法合成了一系列固定在还原氧化石墨烯（CeO _（2）-SnO _（x）/ rGO）催化剂上的铈和锡氧化物，并通过NO的选择性催化还原（SCR）研究了它们的催化活性。 NH _（3）在120–280°C的温度范围内。结果表明，CeO _（2）–SnO _（x）/ rGO催化剂在120–280°C的温度范围内显示出较高的SCR活性和对N _（2）的选择性。质量比为（Ce + Sn）/ GO = 3.9的催化剂在160°C时NO转化率约为86％，在200–280°C的温度下NO转化率高于97％，N _（2以上） ）在120–280°C下的选择性。另外，该催化剂具有一定的SO_（2）抗性。发现由于Sn〜（4+）掺入CeO_（2）的晶格中，高度分散的CeO_（2）纳米颗粒沉积在rGO纳米片的表面上。 CeO _（2）–SnO _（x）/ rGO催化剂的介孔结构提供了大的比表面积和更多的活性位点，以促进反应物的吸附，从而提高了SCR活性。更重要的是，铈和氧化锡之间的协同相互作用导致了出色的SCR活性，这导致Ce〜（3+）/（Ce〜（3+）+ Ce〜（4+））的比例更高， CeSn（3.9）/ rGO催化剂表面化学吸附氧的浓度和氧空位，更强的酸位和更强的酸强度。

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