The positive effect of water on acetaldehyde oxidation depended on the reaction temperature and MnO2 structure
The positive effect of water on acetaldehyde oxidation depended on the reaction temperature and MnO2 structure
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DOI：
10.1016/j.apcatb.2021.120886
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Zeyu Zhao;Ganggang Li;Yonggang Sun;Na Li;Zhongshen Zhang;Jie Cheng;Chun-Hui Ma;Z. Hao
中科院分区：
文献类型：
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作者：
Zeyu Zhao;Ganggang Li;Yonggang Sun;Na Li;Zhongshen Zhang;Jie Cheng;Chun-Hui Ma;Z. Hao
The effect of H2O on acetaldehyde oxidation was studied and α-, γ-, δ-MnO2can be affected by the H2O vapor, while β-MnO2is hardly affected by the H2O vapor during acetaldehyde oxidation. The H2O vapor can facilitate the catalytic oxidation of acetaldehyde at moderate temperatures (ca. 70∼100 °C), with a negative effect observed at high temperatures (>100 °C). The stretching mode of the Mn−O−Mn chains in α-, γ-, δ-MnO2allows the associatively adsorbed water to absorb on the surface prior to acetaldehyde. Afterwards, acetaldehyde can form hydrogen bonds with the associatively adsorbed water molecules, thus, producing the intermediate carboxylic acid species, which are easily degraded to CO2. The negative effect of H2O on the acetaldehyde oxidation at high temperatures is attributed to the difficulty in adsorbing acetaldehyde on MnO2via hydrogen bonding with the adsorbed H2O. These findings reveal the role of water in the catalytic oxidation of acetaldehyde.
