On the development of active and stable Pd-Co/γ-Al2O3 catalyst for complete oxidation of methane
On the development of active and stable Pd-Co/γ-Al2O3 catalyst for complete oxidation of methane
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DOI：
10.1016/j.cej.2014.12.099
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发表时间：
2015-04-15
影响因子：
15.1
通讯作者：
Aleksieva, K.
中科院分区：
文献类型：
--
作者：
Stefanov, P.;Todorova, S.;Aleksieva, K.
通过改变Co的负载量和Pd-Co在γ-Al_2O_3上的沉积顺序，开发出高活性和稳定的甲烷燃烧催化剂。用X射线衍射仪(XRD)、X射线光电子能谱(XPS)、电子顺磁共振(EPR)、透射电子显微镜(TEM)和反应动力学测试对催化剂进行了表征。氧化钴相的作用是使钯稳定在氧化态，并作为氧物种的储存库。Pd-Co催化剂上的反应可能通过Marsvan Krevelen机理进行，水分子与甲烷分子竞争PdO的吸附中心。进一步的实验是为了制备和测试基于阳极氧化铝和Fe-Cr-Al合金载体的结构(整体式)催化剂的样品，因此活性相的组成与最有希望的以氧化铝颗粒为载体的相相同。(C)2015爱思唯尔B.V.保留所有权利。
The study is focused on the development of highly active and stable catalyst for combustion of methane by varying the Co loading and sequence of Pd-Co deposition onto gamma-Al2O3. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), transmission electron microscopy (TEM) and reaction kinetics measurements. The role of the cobalt oxide phase is revealed to stabilize the palladium in oxidized state and to serve as reservoir of oxygen species. The reaction pathway over Pd-Co catalysts proceeds most probably through Marsvan Krevelen mechanism, the water molecules being in competition with the methane molecules for the PdO adsorption sites. Further experiments were carried out to prepare and test samples in the form of structured (monolithic) catalysts, based on anodic alumina and Fe-Cr-Al-alloy carriers, whereupon the composition of the active phase is the same as that of the most promising one, supported on crushed alumina particles. (C) 2015 Elsevier B.V. All rights reserved.