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An egg-shell bifunctional CeO2-modified NiPd/Al2O3 catalyst for petrochemical processes involving selective hydrogenation and hydroisomerization
Journal of Rare Earths ( IF 4.9 ) Pub Date : 2020-10-06 , DOI: 10.1016/j.jre.2020.09.017
Franklin J. Méndez , Javier A. Alves , Yahsé Rojas-Challa , Oscar Corona , Yanet Villasana , Julia Guerra , Germán García-Colli , Osvaldo M. Martínez , Joaquín L. Brito

The catalytic performance during the 1-butyne hydrogenation using two reduced Al2O3-supported Pd-based catalysts was carried out in a total recirculation system with an external fixed-bed reactor. The lab-prepared egg-shell NiPd/CeO2-Al2O3 catalyst (NiPdCe) with Pd loading = 0.5 wt%, Ni/Pd atomic ratio = 1 and CeO2 loading = 3 wt% was synthesized and characterized, and it was compared with an egg-shell Al2O3-supported Pd based commercial catalyst (PdCC). The reduced catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The textural characteristics and ammonia temperature-programmed desorption profiles of the fresh (unreduced) catalysts were also obtained. Both catalysts show high 1-butyne conversion and selectivity to 1-butene, but the catalysts also present important differences between hydroisomerizing and hydrogenating capabilities. NiPdCe catalyst shows higher capability for hydroisomerization reactions, while the PdCC catalyst exhibits higher hydrogenating capability. The observed catalytic performances can be interesting for some industrial processes and can provide a guideline for the development of a Pd-based catalyst with specific catalytic properties.



中文翻译:

用于涉及选择性加氢和加氢异构化的石化过程的蛋壳双功能 CeO2 改性 NiPd/Al2O3 催化剂

使用两种还原型 Al 2 O 3负载的 Pd 基催化剂在1-丁炔加氢过程中的催化性能在具有外部固定床反应器的全循环系统中进行。合成并表征了实验室制备的蛋壳NiPd/CeO 2 -Al 2 O 3催化剂(NiPdCe),Pd 负载量= 0.5 wt%,Ni/Pd 原子比= 1,CeO 2负载量= 3 wt%,并对其进行表征。与蛋壳型 Al 2 O 3 比较-负载型基于钯的商业催化剂 (PdCC)。还原后的催化剂通过 X 射线衍射、X 射线光电子能谱和高分辨率透射电子显微镜进行表征。还获得了新鲜(未还原)催化剂的结构特征和氨程序升温解吸曲线。两种催化剂都显示出高 1-丁炔转化率和对 1-丁烯的选择性,但催化剂在加氢异构化和加氢能力之间也存在重要差异。NiPdCe 催化剂表现出更高的加氢异构化反应能力,而 PdCC 催化剂表现出更高的加氢能力。观察到的催化性能对于某些工业过程可能很有趣,并且可以为开发具有特定催化性能的 Pd 基催化剂提供指导。

更新日期:2020-10-06
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