Lewis acid Sn-Beta catalysts for the cycloaddition of isoprene and methyl acrylate: a greener route to bio-derived monomers. Issue 24 (10th November 2022)

• Record Type: Journal Article
• Authors: Treu, Philipp; Huber, Philipp; Plessow, Philipp N.; Studt, Felix; Saraçi, Erisa
• Is Part Of: Catalysis science & technology. Volume 12:Issue 24(2022)
• Page Start: 7439
• Page End: 7447
• Publication Date: 2022-11-10
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d2cy01337a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Framework-Sn sites in Sn-Beta zeolites provide the required Lewis acidity to selectively catalyze the Diels–Alder cycloaddition between methyl acrylate and isoprene, affording a precursor to bio-terephthalic acid. Abstract : Sn-Beta zeolite catalysts were unprecedently used for the Diels–Alder cycloaddition reaction between bio-available methyl acrylate and isoprene affording intermediates to bio-terephthalates. The use of the solid Lewis acid Sn-Beta allows for a greener process which is also more feasible for industrial implementation, when compared to the presently used homogeneous and often hazardous catalysts. Incorporating Sn IV in the zeolite beta framework by dealumination followed by solid-state ion-exchange, resulted in an efficient cycloaddition catalyst with a selectivity favoring the para -adduct. Detailed characterization combined with computational DFT studies revealed that the tetrahedral framework Sn-sites in Sn-Beta zeolites are responsible for the superior catalytic activity and selectivity, which is maintained even at elevated temperatures.