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Kinetics of acetic acid synthesis from ethanol over a Cu/SiO2 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
41241 45882 2011 11 PDF Available
Title
Kinetics of acetic acid synthesis from ethanol over a Cu/SiO2 catalyst
Abstract

The dehydrogenation of ethanol via acetaldehyde for the synthesis of acetic acid over a Cu based catalyst in a new process is reported. Specifically, we have studied a Cu on SiO2 catalyst which has shown very high selectivity to acetic acid via acetaldehyde compared to competing condensation routes. The dehydrogenation experiments were carried out in a flow through lab scale tubular reactor. Based on 71 data sets a power law kinetic expression has been derived for the description of the dehydrogenation of acetaldehyde to acetic acid. The apparent reaction order was 0.89 with respect to water and 0.45 with respect to acetaldehyde, and the apparent activation energy was 33.8 kJ/mol. The proposed oxidation of acetaldehyde with hydroxyl in the elementary rate determining step is consistent with these both. Density Functional Theory (DFT) calculations show the preference of water cleavage at the Cu step sites. In light of this, an observed intrinsic activity difference between whole catalyst pellets and crushed pellets may be explained by the Cu crystal size and growth rate being functions of the catalyst particle size and time.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (85 K)Download as PowerPoint slideHighlights► Cu/SiO2 is a selective catalyst for the dehydrogenation of ethanol to acetic acid. ► An empirical kinetic model was derived based on 71 data sets. ► A suggested hydroxyl oxidation pathway is consistent with the kinetic model. ► The activity of the catalyst was maintained for more than 800 h.

Keywords
Ethanol dehydrogenation; Acetic acid; Cu crystal; Kinetics; Step sites
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Kinetics of acetic acid synthesis from ethanol over a Cu/SiO2 catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 402, Issues 1–2, 31 July 2011, Pages 69–79
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
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