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Direct dehydrogenation of propane over Pd nanoparticles encapsulated within IPC zeolites with tunable pore sizes
Authors: Sajad Mehran | Zhang Yuyan | Kubu Martin | Mazur Michal | Bulánek Roman | Cejka Jiri
Year: 2022
Type of publication: článek v odborném periodiku
Name of source: Applied Materials Today
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: "101644-1"-"101644-14"
Titles:
Language Name Abstract Keywords
cze Přímá dewhydrogenace propanu na Pd nanočásticích zapouzdřených uvnitř IPC zeolitu s volitelnou velikostí pórů Byly připraveny dobře dispergované nanočástice Pd zapouzdřené uvnitř IPC-2 a IPC-4 zeolitů pomocí ADOR procesu založeného na 3D-2D-3D transformaci. Pomocí strukturní a texturní analýzy byla ověřena inkorporace Pd nanočástic. Připravené materiály byly testovány jako katalyzátory pro dehydrogenaci propanu na propen. dehydrogenace; propan; propen; IPC zeolity; Pd nanočástice
eng Direct dehydrogenation of propane over Pd nanoparticles encapsulated within IPC zeolites with tunable pore sizes Propane dehydrogenation (PDH) yields propene, a valuable feedstock in increasing global demand. Yet, despite recent advances in supported metal nanoparticles (NPs) for such catalytic applications, preventing nanoparticle agglomeration remains a challenge. In this study, we prepared well-dispersed Pd nanoparticles and encapsulated them within IPC-2 and IPC-4 zeolites using the Assembly, Disassembly, Organization, and Reassembly (ADOR) process based on the 3D-2D-3D transformation. By structural and textural analysis, we confirmed the synthesis of two 'ADORable' zeolites incorporated with Pd nanoparticles, namely Pd@IPC-2 and Pd@IPC-4. In the direct dehydrogenation of propane, Pd NPs encapsulated within IPC-2 and IPC-4 zeolites outperformed their impreg-nated counterparts (Pd/IPC-2 and Pd/IPC-4), with Pd@IPC-2 showing a higher catalytic activity than Pd@IPC-4. Accordingly, in addition to the number of surface Pd atoms, the size of the zeolite channels and the structure of the framework strongly affect the catalytic activity of encapsulated Pd. Moreover, confining Pd NPs inside zeolite channels prevented their sintering and agglomeration during the reaction as Pd NPs in impregnated catalysts expanded during the reaction. However, the structure of the zeolite encapsulated with Pd catalysts partly collapsed due to the harsh conditions of the dehydrogenation reaction, hindering access to Pd NPs, as observed in IR spectra. Therefore, palladium NPs are stable within zeolites and do not sinter, but their catalytic activity gradually decreases with the formation of carbon deposits. Although these deposites are removable by calci-nation, reactivation does not completely restore the original activity due to framework disruption and limited access to the active species. dehydrogenation; propane; propene; IPC zeolites; Pd nanoparticles

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