Phosphotungstic acid impregnated niobium coated superparamagnetic iron oxide nanoparticles as recyclable catalyst for selective isomerization of terpenes

Author(s)

Name, Luccas Lossano ; Toma, Sergio Hiroshi ; Nogueira, Helton Pereira ; Avanzi, Luis Humberto ; Pereira, Rafael dos Santos ; Peffi Ferreira, Luis Fernando ; Araki, Koiti ; Cella, Rodrigo ; Toyama, Marcos Makoto

• Document type: Journal article
• Source: RSC ADVANCES; v. 11, n. 23, p. 10-pg., 2021-04-23.

Abstract

Conversion efficiency as high as 80-100% and 50% selectivity for camphene and limonene was achieved with low production of polymeric byproducts (18-28%), easy recovery with a magnet and reuse for up to five cycles maintaining similar activity and distribution of products, using a new magnetically recyclable catalyst based on niobium oxide coated on superparamagnetic iron oxide nanoparticles (SPION) impregnated with phosphotungstic acid (HPW). The catalyst was demonstrated to be effective in the selective conversion of alpha and beta-pinenes into valuable terpenes, under ultrasonic probe activation and with toluene as solvent. A unique synergic effect between the components generating more active and selective catalytic sites was demonstrated, indicating that the SPION covered with 30 wt% of Nb2O5 gives the best performance when impregnated with HPW as co-catalyst. The materials were fully characterized by XRD, EDX, XPS, TEM, BET, VSM and FTIR. (AU)

• FAPESP's process: 18/10128-8 - Ultrasound waves as energy source in process of adding value to biomass
• Grantee: Rodrigo Cella
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/21489-1 - Supramolecular nanotechnology: design, materials and devices
• Grantee: Henrique Eisi Toma
• Support Opportunities: Research Projects - Thematic Grants