Environmentally-friendly fabrication of Pd nanocatalysts with efficient catalytic dehydrogenation of dodecahydro-N-ethylcarbazole

• Published in: Microporous and mesoporous materials Vol. 379; p. 113271
• Main Authors: Wei, Zhongyuan, Bai, Xuefeng, Wu, Wei
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-11-2024
• Subjects: Dehydrogenation; Dodecahydro-N-Ethylcarbazole; Environmentally-friendly preparation; Pd nanocatalysts; Ultrasound in-situ reduction; Dodecahydro-N-Ethylcarbazole; Pd nanocatalysts; Dehydrogenation; Environmentally-friendly preparation; Ultrasound in-situ reduction
• ISSN: 1387-1811
• DOI: 10.1016/j.micromeso.2024.113271

The environmentally-friendly preparation of high performance catalytic dodecahydro-N-ethylcarbazole (12H-NEC) dehydrogenation catalysts is consistent with green chemistry. Beta zeolite loaded ultrafine palladium nanocatalysts (Pd/Beta) were fabricated by ultrasound in-situ reduction (USR) in the absence of chemical reducing and stabilizing agents, and used to efficiently catalyze 12H-NEC dehydrogenation. The catalysts were characterized by XPS, XRD, TEM, SEM and FT-IR, which revealed that Pd nanoparticles (NPs) were highly dispersed on the surface of Beta zeolite with an average particle size of 1.84 nm. The USR method facilitated the metal-carrier interaction, which led to better catalytic activity and stability for dehydrogenation of 12H-NEC, the efficiency of dehydrogenation was 100 % at 6 h and the TOF achieved 70.44 min−1, when it still reached 94 % after 7 cycles.
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•Pd/Beta-EU catalysts with efficient 12H-NEC dehydrogenation were prepared by USR.•Ultrafine Pd NPs with more Pd (111) crystal facets were exposed to improve catalytic activity via USR.•Ultrasound promoted metal-carrier interactions contributing to catalytic stability.•Dehydrogenation efficiency of 12H-NEC reached 100 % at 180 °C for 6 h and 94 % after 7 cycles.