CoFe₂O₄ Nanocrystals Mediated Crystallization Strategy for Magnetic Functioned ZSM‐5 Catalysts

Abstract

Zeolites have many applications in the petrochemical and fine chemical industry and their functionalization does expand the spectrum of potentials. However, the integration of functional nanocrystals into zeolite frameworks with controlled size, dispersion, and crystallization behavior still remains a significant challenge. Here, a new synthesis of magnetic functioned ZSM-5 zeolite catalysts via a CoFe 2 O 4 nanocrystal mediated crystallization strategy is reported. It is found that high crystallinity of CoFe 2 O 4 nanocrystals results in a well-dispersed encapsulation of them into a single-crystal of ZSM-5 due to non-further-grown nanocrystals during the fast ZSM-5 growth. On the contrary, low crystallinity of CoFe 2 O 4 nanocrystals leads to the polycrystalline zeolite growth due to the secondary growth of nanocrystals accompanied by the zeolite crystallization and large lattice mismatch between them. The successful encapsulation of small CoFe 2 O 4 nanocrystals (≈4 nm) into single crystals lies on the preattachment of them into solid silica gel. During the growth of ZSM-5 crystals, no secondary growth of nanocrystals happens and its motion is restricted. The encapsulation of magnetic CoFe 2 O 4 nanocrystals not only endows magnetic function into zeolites for the first time, but also does not impact catalytic performance of ZSM-5 in acetalization of cyclohexanone with methanol, which is highly promising in catalytic industries.

Controlled Nanostructure of Zeolite Crystal Encapsulating FeMnK Catalysts Targeting Light Olefins from Syngas

“…The FeMnK@S-1 catalyst, with mixed metal oxide encapsulated by aggregated silicalite-1 nanorods, was obtained by in situ crystallization following a reported procedure with modifications. − Initially, the precursor FeMnK/SiO 2 with the same metal loading as FeMnK/S-1 was obtained by extensive impregnation, via a specific procedure similar to that described in Section . Subsequently, FeMnK/SiO 2 composites as a silicon source were added to a mixture of H 2 O, EtOH, NH 3 .H 2 O, and TPAOH under stirring to get a molar ratio of 3TPAOH/100EtOH/10SiO 2 /320H 2 O/40NH 3 .…”

Implanting Colloidal Nanoparticles into Single‐Crystalline Zeolites for Catalytic Dehydration

“…Colloidal nanoparticles with magnetic properties, when used as the core in zeolite hybrid materials, present exciting possibilities for catalysis, [21–23] environmental remediation [24,25] and adsorption [26] . The prevalent surface modification techniques are often employed to assemble magnetic cores with polycrystalline zeolite shells [13,14,25,27] . Nevertheless, the insufficient interfacial bonding‐principally electrostatic adsorption‐between the core and shell can lead to structural instability.…”

Facile preparation of a cost-effective platform based on ZnFe2O4 nanomaterials for electrochemical cell detection

“…This is owing to their numerous advantages such as tunable composition and structure, enhanced chemical stability, and the magnetic properties that allow their capturing by applying magnetic fields. These magnetic metal oxides can be highly beneficial in cancer therapy 10 , wound healing 11 , 12 , sensors 13 , 14 , catalysts 15 , supercapacitors 16 , and batteries 17 . In our previous studies, we demonstrated the potential application of functionalized CoFe 2 O 4 nanomaterials in cytosensing 18 , 19 .…”

“…sensors 13,14 , catalysts 15 , supercapacitors 16 , and batteries 17 . In our previous studies, we demonstrated the potential application of functionalized CoFe 2 O 4 nanomaterials in cytosensing 18,19 .…”