SILP materials based on TiO-SiO and TiO-SiO/lignin supports as new catalytic materials for hydrosilylation reaction - synthesis, physicochemical characterization and catalysis

• Published in: RSC advances Vol. 11; no. 38; pp. 23355 - 23364
• Main Authors: Bartlewicz, Olga, Pietrowski, Mariusz, Kaczmarek, Marta, Maciejewski, Hieronim
• Format: Journal Article
• Published: 01.07.2021
• ISSN: 2046-2069
• DOI: 10.1039/d1ra03966k

The oxide system TiO 2 -SiO 2 as well as a TiO 2 -SiO 2 /lignin system have been obtained by the sol-gel synthesis method and applied as supports in Supported Ionic Liquid Phase (SILP) materials. In total 24 SILP systems were obtained with ionic liquids containing imidazolium, pyridinium, phosphonium or sulfonic cations and bis(trifluoromethylsulfonyl)imide or methylsulfate anions, and homogeneous complexes of rhodium or platinum as the active phase. The supports and catalytic materials were subjected to thorough characterization by elemental analysis, XRD, SEM-EDX, IR, and TGA, and their particle size distribution and porous properties were assessed. The new SILP materials were used in hydrosilylation of 1-octene with 1,1,1,3,5,5,5-heptamethyltrisiloxane. The effectiveness of hydrosilylation reaction catalyzed by the obtained SILP materials for the polar and nonpolar reagents was assessed. All the catalytically active materials were proved to be easy to isolate and reuse, and the best SILP systems have been shown to be active in 10 or more subsequent catalytic cycles. 24 new easily isolated and reusable Pt-SILP and Rh-SILP materials with TiO 2 -SiO 2 and TiO 2 -SiO 2 /lignin supports, with improved durability and stability, as effective catalysts for hydrosilylation reactions.