The application of inelastic neutron scattering to investigate CO hydrogenation over an iron Fischer-Tropsch synthesis catalyst
The application of inelastic neutron scattering to investigate CO hydrogenation over an iron Fischer-Tropsch synthesis catalyst
复制标题
DOI：
10.1016/j.jcat.2014.02.004
复制
发表时间：
2014-04-01
影响因子：
7.3
通讯作者：
Lennon, David
中科院分区：
文献类型：
--
作者：
Hamilton, Neil G.;Warringham, Robbie;Lennon, David
制备了F-T铁系催化剂，并以623 K和723 K下的CO加氢反应进行了评价。微型反应器的测量建立了反应轮廓。然后放大反应，以获得催化剂的非弹性中子散射(INS)测量。InS谱(200-4000 cm(-1))的特征是烃类部分和羟基的组合。低温样品以脂肪覆盖层为特征，高温样品的碳氢化合物特征为部分氢化的多环芳烃。通过程序升温氧化、粉末X-射线衍射、拉曼散射和透射电子显微镜等手段对催化剂进行了表征。这一系列的测量结合在一起，提出了催化剂从前体状态到稳定操作过程中的组成模型。这项工作的特点是与使用INS来表征多相催化反应体系有关的一些挑战。(C)2014 Elsevier Inc.保留所有权利。
An iron Fischer-Tropsch (F-T) catalyst has been prepared and evaluated using CO hydrogenation at 623 and 723 K as a test reaction. Micro-reactor measurements establish reaction profiles. The reaction is then scaled up to enable inelastic neutron scattering (INS) measurements of the catalyst to be acquired. The INS spectra (200-4000 cm(-1)) are characterised by a combination of hydrocarbon moieties and hydroxyl groups. Whereas the low temperature sample is characterised by an aliphatic overlayer, the hydrocarbon features of the high temperature sample are attributed to partially hydrogenated polycyclic aromatic compounds. The catalyst is further characterised by a combination of temperature-programmed oxidation, powder X-ray diffraction, Raman scattering and transmission electron microscopy. This series of measurements is combined to propose a model for the composition of the catalyst as it progresses from the precursor state to steady-state operation. The work features some of the challenges associated with using INS to characterise heterogeneously catalysed reactions systems. (C) 2014 Elsevier Inc. All rights reserved.