Copper doped ceria porous nanostructures towards a highly efficient bifunctional catalyst for carbon monoxide and nitric oxide elimination.
Copper doped ceria porous nanostructures towards a highly efficient bifunctional catalyst for carbon monoxide and nitric oxide elimination.
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铜掺杂二氧化铈多孔纳米结构用于消除一氧化碳和一氧化氮的高效双功能催化剂
DOI：
10.1039/c5sc00129c
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发表时间：
2015-04-16
期刊：
影响因子：
8.4
通讯作者：
Zhang Y
中科院分区：
文献类型：
--
作者：
Li S;Wang N;Yue Y;Wang G;Zu Z;Zhang Y
通过焙烧CeCu-MOF纳米晶制备了Cu2+掺杂CeO2多孔纳米材料。它们对CO的氧化和NO的选择性催化还原表现出了优异的双功能催化性能。采用高效、通用的金属有机骨架驱动自模板法制备了具有可调比表面积的铜掺杂CeO2多孔纳米结构。X射线衍射仪、扫描电子显微镜和透射电子显微镜结果表明，Cu2+已成功取代CeO2晶格，并均匀分散在CeO2：Cu2+纳米晶中。CeO2：Cu2+纳米晶对CO氧化和NO选择性催化还原表现出优异的双功能催化性能。有趣的是，CeO2：Cu2+纳米晶上的CO氧化反应活性与Cu2+的掺杂量和比表面积有关。通过选择不同的有机配体来调节Cu2+的含量和BET比表面积，Cecu-BPDC纳米晶热解得到的CeO2：Cu2+纳米晶上CO的100%转化温度可以降低到110℃，即使在5次循环后，多孔纳米材料也表现出高的CO转化率。此外，催化剂的NO还原活性随BET比表面积的增加而增加，这与CO氧化反应的结果一致。
Cu2+ doped CeO2 porous nanomaterials were synthesized by calcining CeCu–MOF nanocrystals. They exhibited a superior bifunctional catalytic performance for CO oxidation and selective catalytic reduction of NO. Copper doped ceria porous nanostructures with a tunable BET surface area were prepared using an efficient and general metal–organic-framework-driven, self-template route. The XRD, SEM and TEM results indicate that Cu2+ was successfully substituted into the CeO2 lattice and well dispersed in the CeO2:Cu2+ nanocrystals. The CeO2:Cu2+ nanocrystals exhibit a superior bifunctional catalytic performance for CO oxidation and selective catalytic reduction of NO. Interestingly, CO oxidation reactivity over the CeO2:Cu2+ nanocrystals was found to be dependent on the Cu2+ dopants and BET surface area. By tuning the content of Cu2+ and BET surface area through choosing different organic ligands, the 100% conversion temperature of CO over CeO2:Cu2+ nanocrystals obtained from thermolysis of CeCu–BPDC nanocrystals can be decreased to 110 °C. The porous nanomaterials show a high CO conversion rate without any loss in activity even after five cycles. Furthermore, the activity of the catalysts for NO reduction increased with the increase of BET surface, which is in accordance with the results of CO oxidation.