Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, Liaoning, 110034, China.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, 18# Fuxue Road, Chang Ping, Beijing 102249, China.
Sci Rep. 2017 Apr 26;7:43894. doi: 10.1038/srep43894.
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 SiO is used as support and microporous K-OMS-2 oxide nanoparticles are supported on the wall of SiO. 3DOM K-OMS-2/SiO oxide catalysts were firstly used in soot particle oxidation reaction and they show very high catalytic activities. The high activities of K-OMS-2/SiO 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 T of K-OMS-2/SiO-50, 328 °C, is much lower than those of Pt/AlO and 3DOM Au/LaFeO, 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.
首次通过简单的方法设计并成功合成了一系列新型的含有三维有序大孔（3DOM）和微孔结构的氧化物催化剂。在制备的催化剂中，3DOM SiO 用作载体，微孔 K-OMS-2 氧化物纳米颗粒负载在 SiO 的壁上。3DOM K-OMS-2/SiO 氧化物催化剂首次用于烟灰颗粒氧化反应，表现出非常高的催化活性。K-OMS-2/SiO 氧化物催化剂的高活性可归因于以下三个可能的原因：3DOM 结构的大孔效应可改善烟灰与催化剂之间的接触，K-OMS-2 的微孔效应可吸附小分子气体，K 和 Mn 的相互作用可激活气体分子。在中高温范围内，催化剂的催化活性可与贵金属催化剂相媲美，甚至更高。例如，K-OMS-2/SiO-50 的 T 为 328°C，远低于 Pt/AlO 和 3DOM Au/LaFeO 的 464°C 和 356°C。此外，催化剂表现出高的催化稳定性。这归因于 K 离子被引入 OMS-2 的微孔结构中，并在催化反应中稳定存在。同时，K 离子在模板化和稳定 OMS-2 的隧道骨架方面发挥着重要作用。
