Pd@Al2O3‐Catalyzed Hydrogenation of Allylbenzene to Propylbenzene in Methanol and Aqueous Micellar Solutions. Issue 12 (3rd November 2015)

• Record Type: Journal Article
• Authors: Arbelaez, Oscar; Correa, Luis; Parapat, Riny Yolanda; Knemeyer, Kristian; Bustamante, Felipe; Villa, Aída Luz; Schwarze, Michael
• Is Part Of: Chemical engineering & technology. Volume 38:Issue 12(2015:Dec.)
• Page Start: 2291
• Page End: 2298
• Publication Date: 2015-11-03
• Subjects: Allylbenzene -- Hydrogenation -- Micelles -- Pd@Al2O3 -- Surfactant; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201500316
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: The palladium on alumina (Pd@Al2 O3 )‐catalyzed hydrogenation of allylbenzene to propylbenzene was studied in methanol and aqueous micellar solutions of sodium dodecyl sulfate (SDS), decyltrimethylammonium bromide (DTAB), and t ‐octylphenoxypolyethoxyethanol (TX‐100). Over Pd@Al2 O3, propylbenzene was obtained via direct hydrogenation of allylbenzene and isomerization to β ‐methylstyrene which was hydrogenated afterwards. In aqueous micellar solutions, the reaction was faster than in pure water, but slower than in methanol due to lower hydrogen solubility. In the H2 O/SDS system, a higher activation energy was obtained than in methanol. For the investigated surfactants, the initial reaction rate in the micellar systems decreased in the order SDS > TX‐100 > DTAB. Abstract : The Pd@Al2 O3 ‐catalyzed hydrogenation of allylbenzene to propylbenzene is studied in methanol and aqueous micellar solutions of SDS, TX‐100, and DTAB to follow the trend of green reaction media. For the heterogeneous catalyst it is shown that hydrogenation reaction can occur in water and best performance is obtained with the anionic surfactant SDS.