Enhancement of the Partial Oxidation of Methanol Reaction over CuZn Catalyst by Mn Promoter

A series of in situ experiments on mechanisms and top-down LHHW (Langmuir–Hinshelwood–Hougen–Watson) microkinetic analysis were conducted for the partial oxidation of methanol on CuMnZn (ca. 28.0 wt % Cu, 23 wt % Mn, and 49 wt % Zn) catalyst. In comparison with CuZn (ca. 29 wt % Cu and 71 wt % Zn),...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2014-08, Vol.53 (32), p.12622-12630
Main Authors: Lee, Kuan-Yi, Shen, Chia-Chieh, Huang, Yuh-Jeen
Format: Article
Language:English
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Summary:A series of in situ experiments on mechanisms and top-down LHHW (Langmuir–Hinshelwood–Hougen–Watson) microkinetic analysis were conducted for the partial oxidation of methanol on CuMnZn (ca. 28.0 wt % Cu, 23 wt % Mn, and 49 wt % Zn) catalyst. In comparison with CuZn (ca. 29 wt % Cu and 71 wt % Zn), CuMnZn catalyst with the structure of copper–manganese spinel CuMn2O4 enhanced the turnover frequency (TOF) for methanol conversion at a lower temperature (from 4.2 to 10.1 s–1 at 150 °C). Mn also played a role in electronic charge transfer, which could enhance formate decomposition and mitigate the accumulation of carbonate species at high temperature. From a kinetic modeling analysis, the activation energy of CuZn-based catalyst was apparently reduced from 22.4 to 16.5 kcal/mol by the Mn promoter.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie501023z