Revana Chanerika, Mzamo L. Shozi, M. Prato
Nov 18, 2022
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ChemCatChem
Abstract
The selective hydrogenation of octyne in a mixed 1‐octyne/1‐octene feed was investigated by employing Pd/Al2O3 and PdAg/Al2O3 catalysts coated with 1‐butyl‐3‐methylimidazolium dicyanamide ([BMIM][DCA]) as SCILLs (Solid Catalysts with an Ionic Liquid Layer). All SCILLs were compared to an organically modified, 1‐ethylimidazole (EIM) coated catalyst to determine if there is a SCILL effect. Results of the catalysis showed that both uncoated catalysts were highly active (100 % 1‐octyne and 1‐octene conversion) in the hydrogenation reactions with dominant selectivity towards octane. No increase of 1‐octene in the reactor outflow (octene gain) was noted. Coating 1Pd/Al2O3 with [BMIM][DCA] at four monolayers (ML) corresponding to a surface loading of 45 wt% still gave 100 % octyne conversion but now with a 54 % 1‐octene gain, as no octene was converted. Coating 1Pd9Ag/Al2O3 with only a single monolayer of [BMIM][DCA] (14 wt%) was sufficient to give a 1‐octene gain of 84 % at an octyne conversion of 91 %. Time‐on‐stream reactions for the uncoated and SCILL systems showed stable operation during the experiments.