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Wet-impregnated bimetallic Pd-Ni catalysts with enhanced activity for dehydrogenation of perhydro-N-propylcarbazole
International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2020-09-12 , DOI: 10.1016/j.ijhydene.2020.08.162
Xuedi Chen , Gen Li , Min Gao , Yuan Dong , Ming Yang , Hansong Cheng

Palladium/platinum-based catalysts are widely used in the dehydrogenation process of Liquid Organic Hydrogen Carriers (LOHCs). The cost of noble metal has become a main drawback for LOHCs large-scale application. Partial replacement of Pd/Pt by other transition metals can be an effective solution. In this paper, we synthesize the bimetallic Pd–Ni catalyst by incipient wet impregnation and the catalytic dehydrogenation performance of perhydro-N-propylcarbazole (12H-NPCZ) as a LOHC candidate. Ni and Pd were impregnated on mesoporous alumina to obtain both monometallic and bimetallic catalysts, i.e. Pd/Al2O3, Ni/Al2O3 and Pd–Ni/Al2O3 (Pd:Ni = 1:1) with total metal loading of 5 wt%, respectively. The above catalysts were characterized by N2-adsorption/desorption, H2-temperature programmed reduction, X-Ray diffraction, X-Ray photoelectron spectroscopy, Inductively coupled plasma - optical emission spectrometer, CO pulse adsorption and Transmission electron microscopy. The catalytic dehydrogenation results indicated that the bimetallic Pd–Ni/Al2O3 showed best catalytic activity, followed by Pd/Al2O3, commercial Pd/Al2O3 and Ni/Al2O3. Notably, the catalytic activity of bimetallic was well maintained after 5 cycles at 200 °C with no degradation, indicating this bimetallic catalyst has potential prospect for large-scale application.



中文翻译:

湿浸渍双金属Pd-Ni催化剂,具有增强的全氢N-丙基咔唑脱氢活性

钯/铂基催化剂广泛用于液态有机氢载体(LOHC)的脱氢过程中。贵金属的成本已成为LOHC大规模应用的主要缺点。用其他过渡金属部分替代Pd / Pt可能是一种有效的解决方案。在本文中,我们通过初期湿式浸渍法和作为LOHC候选物的全氢N-丙基咔唑(12H-NPCZ)的催化脱氢性能合成了双金属Pd-Ni催化剂。将Ni和Pd浸渍在介孔氧化铝上以获得单金属和双金属催化剂,即Pd / Al 2 O 3,Ni / Al 2 O 3和Pd-Ni / Al 2 O 3(Pd:Ni = 1:1),总金属负载量分别为5 wt%。上述催化剂的特征在于N 2-吸附/解吸,H 2-程序升温还原,X射线衍射,X射线光电子能谱,电感耦合等离子体-光发射光谱仪,CO脉冲吸附和透射电子显微镜。催化脱氢结果表明,双金属Pd-Ni / Al 2 O 3表现出最佳的催化活性,其次是Pd / Al 2 O 3,商用Pd / Al 2 O 3和Ni / Al 2 O 3。。值得注意的是,双金属催化剂的催化活性在200°C下经过5个循环后可以很好地保持,并且没有降解,表明该双金属催化剂具有大规模应用的潜在前景。

更新日期:2020-11-02
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