Structural and Kinetics Understanding of Support Effects in Pd-Catalyzed Semi-Hydrogenation of Acetylene

• DOI: 10.1016/j.eng.2020.06.023
• Publication Date: 2020-12-08T17:47:29Z
• Authors: Yueqiang Cao; Xiaohu Ge; Yurou Li; Rui Si; Zhijun Sui; Jinghong Zhou; Xuezhi Duan; Xinggui Zhou
• Keywords: Nanomaterial-based catalyst; Acetylene; Palladium hydride; Thermal desorption spectroscopy; Temperature-programmed reduction

In this study, the support effects on Pd-catalyzed semi-hydrogenation of acetylene have been investigated from structural and kinetic perspectives. According to results analysis X-ray photoelectron spectroscopy, hydrogen temperature-programmed reduction, hydride decomposition, in situ diffraction measurements, using carbon nanotubes as for Pd nanocatalysts with various sizes instead α-Al2O3 decreases Pd0 3d binding energy suppresses formation undesirable palladium species, thus increasing ethylene yield. Furthermore, absorption high-resolution transmission electron microscopy, C2H4 desorption studies combined density-functional theory calculations reveal existence a unique local environment, containing subsurface atoms, that produces positive geometric conversion reaction. Therefore, tailoring environment electronic properties represents an effective strategy fabrication design highly active selective catalysts.