Magnetically separable and efficient platinum catalyst: Amino ligand enhanced loading and Fe²⁺ facilitated Pt⁰ formation

Abstract

Understanding the interaction between metal and the support is crucial in searching of efficient and recyclable noble metal heterogeneous catalysts.Herein, we report a core-shell structured support for Pt catalyst with a magnetic Fe 3 O 4 core and a porous silica shell bearing amino groups. The prepared catalyst Fe 3 O 4 @mSiO 2 -APTES-Pt showed a high loading of Pt (7.93 wt%) as well as a high fraction of active Pt 0 species, which both contributed to the high activity toward a model hydrosilylation reaction between 1-octene and 1, 1, 1, 3, 5, 5, 5-heptamethyltrisiloxane (HMTS). X-ray photoelectron spectra (XPS) analysis revealed that the amino ligands played a dominant role in Pt loading and Fe 2+ probably facilitated the formation of low valence Pt 0 . Under the combined effect of magnetic nature of the support and proper support-metal interactions, the catalyst exhibited excellent recyclability with a recovery of 99.7% and a yield of over 90% even after eight runs of recycling. This catalyst may provide a new option in designing and preparing heterogeneous catalysts that are highly recoverable, reusable, and recyclable.