Carbon Molecular Sieve Supported Pd Catalyzed\nHydrogenation of Cinnamaldehyde in Alkaline Medium

Abstract

Synthesis of various fine chemicals and pharmaceuticals are regulated through selective hydrogenation\nof α,β-unsaturated aldehydes. Hydrocinnamaldehyde is one of the important compounds in perfumery\nand flavouring industries. It is highly precarious and challenging to control the product selectivity as\nwell as conversion in cinnamaldehyde hydrogenation. In this study, an effective hydrogenation of\ncinnamaldehyde was attained in presence of aqueous-protic organic medium by utilizing Pd/CMS\nand other additives of alkali such as K2CO3. The Pd/CMS catalyst along with alkali media catalyzed\nthe hydrogenation of C=C selectively in cinnamaldehyde in order to form hydrocinnamaldehyde with\n100% conversion rate. Additionally, the parallel hydrogenation of C=O and C=C bonds in\ncinnamaldehyde takes place in absence of media. The C=O bond reduction in cinnamaldehyde can be\nrestricted through K2CO3 addition to aqueous-protic solution. The active sites of palladium were found\nto be uniform and analyzed using HRTEM data. Based on the mechanism involved in micropores of\ncarbon molecular sieves, the key role of promoter is associated with hydrogenation of cinnamaldehyde.\nThe catalytic criterion was appropriate with the acquired activity data.