Morphological effects of CeO2 nanostructures for catalytic soot combustion of CuO/CeO2
Morphological effects of CeO2 nanostructures for catalytic soot combustion of CuO/CeO2
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DOI：
10.1016/j.cattod.2014.08.005
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发表时间：
2015-05
期刊：
影响因子：
5.3
通讯作者：
Keizo Nakagawa;T. Ohshima;Y. Tezuka;Megumi Katayama;M. Katoh;S. Sugiyama
中科院分区：
文献类型：
--
作者：
Keizo Nakagawa;T. Ohshima;Y. Tezuka;Megumi Katayama;M. Katoh;S. Sugiyama
以胺类表面活性剂自组装体为模板，通过氢氧化碳酸铈的分解制备了棒状和椭球状CeO2纳米结构。不同烷基链长度的胺表面活性剂对产物形貌影响较大。采用常规浸渍法制备了不同形状的CeO2纳米结构负载CuO(CuO/CeO2)催化剂。与形态不受控制的CuO/CeO2相比，CuO/CeO2纳米棒在较低温度下表现出较高的还原性，H2-TPR产生的氧种类较多，并且由于N2吸附而具有较大的外表面积和中孔体积。与形态不受控制的 CuO/CeO2 相比，这些催化剂使用炭黑（CB）作为烟灰颗粒模型，在紧密接触条件下在较低温度下表现出有效的烟灰燃烧。 CuO/CeO2 催化剂较大的外表面积和中孔体积有助于改善 CeO2 催化剂和聚集炭黑之间的物理接触条件。表面还原性和改善的物理接触条件极大地影响了它们对烟灰燃烧的催化活性。
Rod and ellipsoid shaped CeO2nanostructures were prepared using self-assemblies of amine surfactants as templates through the decomposition of cerium carbonate hydroxide. The morphologies of the products were greatly influenced by amine surfactants with different alkyl chain lengths. Different shaped CeO2nanostructures supported CuO (CuO/CeO2) catalysts were prepared by a conventional impregnation method. CuO/CeO2nanorods showed high reducibility at lower temperature, larger amount of oxygen species from H2-TPR and possessed larger external surface area and mesopore volume from N2adsorption as compared with CuO/CeO2with uncontrolled morphology. These catalysts showed effective soot combustion at lower temperature under tight contact condition using carbon black (CB) as a model of soot particle, as compared with CuO/CeO2with uncontrolled morphology. Larger external surface area and mesopore volume of CuO/CeO2catalysts contributed to the improved physical contact condition between CeO2catalysts and aggregated CBs. Surface reducibility and the improved physical contact condition affected greatly their catalytic activity for soot combustion.