Metal–Organic Framework-Membranized Bicomponent Core–Shell Catalyst HZSM-5@UIO-66-NH₂/Pd for CO₂ Selective Conversion

Abstract

In this study, a Zr-based metal–organic framework (MOF)-membranized bicomponent core–shell catalyst HZSM-5@UIO-66-NH2/Pd was produced. Monodispersed HZSM-5 zeolites acted as the core for the epitaxial growth of the UIO-66-NH2 shell to obtain MOF membrane coated HZSM-5@UIO-66-NH2 nanocrystals, and Pd nanoparticles were well-dispersed on its membrane surface. The catalyst HZSM-5@UIO-66-NH2/Pd exhibited high CO selectivity (92.2%) in CO2 hydrogenation.

Chiral Proline-Decorated Bifunctional Pd@NH2-UiO-66 Catalysts for Efficient Sequential Suzuki Coupling/Asymmetric Aldol Reactions

“…67,68 Besides, the bonds observed at 1435 and 1260 cm −1 were assigned to the C−N stretching vibrations. 69,70 The peaks obtained at 1655 cm −1 can be ascribed to the stretching vibrations of −CO. 56 Moreover, the peak located at 520 cm −1 demonstrated the existence of Zr−O absorption band of metal clusters.…”

Rational Design and Growth of MOF‐on‐MOF Heterostructures

“…Generally speaking, the physical characteristics of the MOF itself and the modification of the MOF template can well change the interface energy between the crystal planes, which greatly facilitates the nucleation of MOFs with different cell parameters. [ 127–129 ] According to the following methods, the random but efficient growth of MOF‐on‐MOF composites can be achieved: i) Stable MOF materials are used as robust templates to enhance the ability of the surface to anchor different metal ions and organic ligands under the action of solvents, which will coordinate in situ to form other MOF materials except for parent MOFs; ii) Different structure‐directing agents can modify the surface of the host MOFs and change the growth interface capacity between different MOFs; iii) It is rationally to control the nucleation rate and kinetics growth between the organic ligands and the inorganic metals; iv) MOF‐on‐MOF composites can be induced with the assistance of non‐MOF substrates, such as functional organic films, conductive substrates, insoluble inorganic precursors, etc. It is expected that the facile growth of MOF‐on‐MOF materials between different MOFs exhibits a broad interest in the design, synthesis, application for multifunctional heterostructures from MOFs.…”

Engineering heterogenous catalysts for chemical CO2 utilization: Lessons from thermal catalysis and advantages of yolk@shell structured nanoreactors

“…Aside from MOFs or metal oxides, HZSM-5 has also been found to be an effective media to protect active metal nanoparticles [343,344]. When investigating the potential of a Ni@HZSM-5 catalyst compared to Ni/SiO 2 , the encapsulated material far surpassed the SMN material at 400 °C, where the catalyst demonstrated over 40 hours of continued operation (66% CO 2 conversion, 99.8% methane selectivity).…”