An analysis of electroless deposition derived Ni-Pt catalysts for the dry reforming of methane
An analysis of electroless deposition derived Ni-Pt catalysts for the dry reforming of methane
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DOI：
10.1016/j.jcat.2019.10.035
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发表时间：
2020-01-01
影响因子：
7.3
通讯作者：
Regalbuto, John R.
中科院分区：
文献类型：
--
作者：
Egelske, Benjamin T.;Keels, Jayson M.;Regalbuto, John R.
通过无电沉积精确制备了一系列负载在 γ 氧化铝 (γ-Al2O3) 上的镍铂催化剂，并添加了少量且不断增加的 Pt 促进剂，Ni 含量为 5.0 wt%，Pt 的组成高达 2.8 wt%（Ni 上的一个理论单层 Pt），并评估了其对甲烷干重整的性能。使用 X 射线衍射、程序升温还原、扫描透射电子显微镜和程序升温氧化进行表征。在低于 600 摄氏度的温度下，双金属样品的活性在 0.4 个单层 Pt 处表现出最大值，并超过了未促进的 Ni。在 700 摄氏度时，所有样品均发生失活。高温处理的催化剂的 X 射线衍射图表明 Ni-Pt 合金的偏析。 Pt 对氢选择性没有影响，这是由热力学限制驱动的。 (C) 2019 Elsevier Inc. 保留所有权利。
A series of nickel-platinum catalysts supported on gamma alumina (gamma-Al2O3) with small, increasing amounts of Pt promoter were precisely prepared by electroless deposition at 5.0 wt% Ni and with compositions up to 2.8 wt% Pt (one theoretical monolayer of Pt on Ni) and evaluated for the dry reforming of methane. Characterization was performed using x-ray diffraction, temperature programmed reduction, scanning transmission electron microscopy, and temperature programmed oxidation. At temperatures below 600 degrees C, activity of bimetallic samples exhibited a maximum at 0.4 monolayers Pt and surpassed that of unpromoted Ni. At 700 degrees C, deactivation occurred for all samples. X-ray diffraction patterns of the high-temperature treated catalysts indicated segregation of the Ni-Pt alloys. Pt showed no influence on hydrogen selectivity, which was driven by thermodynamic limits. (C) 2019 Elsevier Inc. All rights reserved.