fulltext.study @t Gmail

Water as solvent in the liquid-phase selective hydrogenation of crotonaldehyde to crotyl alcohol over Pt/ZnO: A factorial design approach

Paper ID Volume ID Publish Year Pages File Format Full-Text
45075 46395 2014 10 PDF Available
Title
Water as solvent in the liquid-phase selective hydrogenation of crotonaldehyde to crotyl alcohol over Pt/ZnO: A factorial design approach
Abstract

•Crotonaldehyde selective reduction was optimized through factorial design.•Solvent was found to be the most influential parameter.•Water weakens CO bond, thus favoring selective reduction.•XPS revealed that ZnOxCly species close to Pt act as Lewis sites favoring selectivity.

The liquid-phase selective reduction of crotonaldehyde to crotyl alcohol was studied on Pt/ZnO. Optimization through factorial design of experiments led to a 75% increase in the yield to crotyl alcohol and solvent was found to be the most influential parameter. The yield to the unsaturated alcohol was found to increase with the water content in water/dioxane mixtures. FT-Raman spectroscopy evidenced the progressive weakening of CO bond as the water content was increased thus accounting for the catalytic results. A study of catalyst reutilization showed an increase in both conversion and selectivity up to the third use, subsequent reuses leading to a drop in both parameters. The data obtained by XRD, XPS, and HAADF showed that the evolution of chlorinated species in the catalytic system were the plausible cause of this behavior.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pt/ZnO; Water as solvent; Crotonaldehyde selective hydrogenation; Crotyl alcohol; Factorial design
First Page Preview
Water as solvent in the liquid-phase selective hydrogenation of crotonaldehyde to crotyl alcohol over Pt/ZnO: A factorial design approach
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 154–155, July–August 2014, Pages 369–378
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis