Redispersion and Stabilization of Cu/MFI Catalysts by the Encapsulation Method for Ethanol Dehydrogenation

Abstract

Encapsulation of metal particles with ordered porous zeolite is a promising method to stabilize nanoparticles. In this work, Cu/MFI catalysts prepared by the impregnation method were encapsulated with MFI to yield (Cu/MFI)@MFI catalysts for ethanol dehydrogenation. The encapsulation process not only anchored Cu particles into MFI but also redispersed Cu with decreased particle sizes and newly formed Cu + species. During the ethanol dehydrogenation reaction, the Cu + and Cu 0 species confined in (Cu/MFI)@MFI catalysts demonstrated synergistic effects and afforded 95.7% acetaldehyde selectivity, 97.2% ethanol conversion at 523 K, and a weight hourly space velocity (WHSV) of 0.53 h −1 in the 200 h time on stream over the optimized (Cu/MFI)@MFI 100% catalyst, which is significantly better than the counterpart of the Cu/MFI catalyst.

Homogeneous vs. heterogeneous catalysts for acceptorless dehydrogenation of biomass-derived glycerol and ethanol towards circular chemistry

“…The use of metal oxides, such as SiO 2 , 90–95 Al 2 O 3 , 96 ZnO 97,98 and MgO 99 as supports for Cu-based dehydrogenation catalysts has been widely studied. Such supports possess relatively high surface area and often facilitate strong metal–support interactions.…”

Perspectives on Recent Advances in Hierarchical Zeolites for Bioethanol Conversion to Chemicals, Jet Fuels, and Carbon Nanotubes

“…Recently, Pang and co-workers 97 reported the synthesis of encapsulated Cu within MFI (Cu/MFI) through steam-assisted solid-state crystallization. This process provides the high dispersion and confinement of Cu species (Cu + or Cu 2+ species) within the MFI framework, enhancing catalytic activity and stability (97.2% ethanol conversion even after 200 h of reaction time).…”

Enhancing Fuel Cell Durability with Heteroenergetic TaOx-Carbon Support

“…However, during operation, supports often suffer from metal particle detachment, migration, and coalescence, leading to diminished efficacy over time. Additionally, Ostwald ripening, where smaller metal particles dissolve and redeposit onto larger particles, further exacerbates the degradation of supported metal catalysts. − …”