Promoter effect of Ce and Pr on the catalytic stability of the Ni-Co system for the oxidative steam reforming of ethanol
Promoter effect of Ce and Pr on the catalytic stability of the Ni-Co system for the oxidative steam reforming of ethanol
复制标题
DOI：
10.1016/j.apcata.2016.08.010
复制
发表时间：
2016-09-25
影响因子：
5.5
通讯作者：
Molina, Rafael
中科院分区：
文献类型：
--
作者：
Munoz, Monica;Moreno, Sonia;Molina, Rafael
本文介绍了在乙醇氧化蒸汽重整 (OSRE) 中用 5 wt% Ce 或 Pr 促进的 Ni 和 Co 混合氧化物的催化稳定性的研究。该催化剂是通过共沉淀法制备的水滑石型前驱体（HT）的煅烧以及在水性（Ce/Pr-EDTA）络合物存在下重建HT相而获得的。通过 X 射线衍射 (XRD)、表面积 (BET)、X 射线荧光 (XRF)、程序升温还原 (TPR-H-2) 以及 CO2 (TPD-CO2) 和 O-2 (TPD-O-2) 程序升温解吸对固体进行表征，并在 OSRE 中另外评估 100 小时。稳定性测试表明稀土的存在促进焦炭前体的减少。这些结果证明了晶格氧的基本作用和氧化物相的还原性。 (C) 2016 Elsevier B.V. 保留所有权利。
This article presents a study of the catalytic stability of Ni and Co mixed oxides promoted with 5 wt% Ce or Pr in the oxidative steam reforming of ethanol (OSRE). The catalysts were obtained by the calcination of hydrotalcite-type precursors (HT) prepared by the co-precipitation method and the reconstruction of the HT phase in the presence of aqueous (Ce/Pr-EDTA) complexes. The solids were characterized by X ray-diffraction (XRD), surface area (BET), X-ray fluorescence (XRF), temperature-programmed reduction (TPR-H-2), and temperature-programmed desorption of CO2 (TPD-CO2) and O-2 (TPD-O-2), and they were additionally evaluated in the OSRE for 100 h. The stability tests indicate that the presence of rare earths promotes a reduction of the precursors of coke. These results evidence the fundamental role of the lattice oxygen and the reducibility of the oxide phases. (C) 2016 Elsevier B.V. All rights reserved.