Efficient Ru-based scrap waste automotive converter catalysts for the continuous-flow selective hydrogenation of cinnamaldehyde. Issue 17 (12th August 2019)

• Record Type: Journal Article
• Authors: Cova, Camilla Maria; Zuliani, Alessio; Muñoz-Batista, Mario J.; Luque, Rafael
• Is Part Of: Green chemistry. Volume 21:Issue 17(2019)
• Page Start: 4712
• Page End: 4722
• Publication Date: 2019-08-12
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/c9gc01596e
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : Mechanochemical preparation of a novel catalyst based on Ru-containing scrap catalytic converters for the selective continuous flow hydrogenation of cinnamaldehyde. Abstract : The selective, efficient and sustainable continuous flow hydrogenation of a α, β-unsaturated aldehyde, i.e. cinnamaldehyde, to the corresponding unsaturated alcohol, i.e. cinnamyl alcohol, using a novel catalyst based on Ru-containing scrap waste automotive converters is reported. The catalyst was prepared by recycling and upgrading waste ceramic-cores of scrap automotive catalytic converters as supporting materials. Ruthenium was incorporated into the ceramic structures using a simple, fast and solventless mechanochemically assisted procedure followed by a chemical reduction step. Different catalysts were prepared with varying Ru contents. The materials were characterized by XRD, N2 physisorption, XPS, TEM, HRTEM and SEM/mapping analyses. Compared to Ru supported over most studied silica and alumina supports, the new system displayed an outstanding catalytic performance under continuous-flow conditions in terms of conversion and selectivity and a remarkable stability with time-on-stream, demonstrating a synergistic action between Ru and the waste catalytic converter support. A Ru loading of 10 wt% provided the optimum results, including a cinnamaldehyde conversion of up to 95% with a selectivity to cinnamyl alcohol of 80%.