Ordered micro/macro porous K-OMS-2/SiO(2) nanocatalysts: Facile synthesis, low cost and high catalytic activity for diesel soot combustion.
Ordered micro/macro porous K-OMS-2/SiO(2) nanocatalysts: Facile synthesis, low cost and high catalytic activity for diesel soot combustion.
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DOI：
10.1038/srep43894
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发表时间：
2017-04-26
影响因子：
4.6
通讯作者：
Liu J
中科院分区：
文献类型：
--
作者：
Yu X;Zhao Z;Wei Y;Liu J
首次设计并合成了一系列具有三维有序大孔（3DOM）和微孔结构的新型氧化物催化剂。在所制备的催化剂中，3DOM SiO2作为载体，微孔K-OMS-2氧化物纳米颗粒负载在SiO2的壁上。3DOM K-OMS-2/SiO2氧化物催化剂首次用于碳烟颗粒氧化反应，表现出很高的催化活性。K-OMS-2/SiO2氧化物催化剂的高活性可归因于3个可能的原因：3DOM结构的大孔效应改善了碳烟与催化剂之间的接触，K-OMS-2的微孔效应吸附了小分子气体，K和Mn的相互作用活化了气体分子。在中高温范围内，催化剂的催化活性与贵金属催化剂相当甚至更高。例如，K-OMS-2/SiO2-50的T50（328 °C）远低于Pt/Al 2 O3和3DOM Au/LaFeO 3的T50（分别为464和356 °C）。此外，催化剂表现出高的催化稳定性。这是由于K+离子被引入到OMS-2的微孔结构中并稳定在催化反应中。同时，K+离子在模板和稳定OMS-2的隧穿框架中起重要作用。
A series of novel oxide catalysts, which contain three-dimensionally ordered macroporous (3DOM) and microporous structure, were firstly designed and successfully synthesized by simple method. In the as-prepared catalysts, 3DOM SiO2 is used as support and microporous K-OMS-2 oxide nanoparticles are supported on the wall of SiO2. 3DOM K-OMS-2/SiO2 oxide catalysts were firstly used in soot particle oxidation reaction and they show very high catalytic activities. The high activities of K-OMS-2/SiO2 oxide catalysts can be assigned to three possible reasons: macroporous effect of 3DOM structure for improving contact between soot and catalyst, microporous effect of K-OMS-2 for adsorption of small gas molecules and interaction of K and Mn for activation of gas molecules. The catalytic activities of catalysts are comparable to or even higher than noble metal catalyst in the medium and high temperature range. For example, the T50 of K-OMS-2/SiO2-50, 328 °C, is much lower than those of Pt/Al2O3 and 3DOM Au/LaFeO3, 464 and 356 °C,respectively. Moreover, catalysts exhibited high catalytic stability. It is attributed to that the K+ ions are introduced into the microporous structure of OMS-2 and stabilized in the catalytic reaction. Meanwhile, the K+ ions play an important role in templating and stabilizing the tunneled framework of OMS-2.