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Issue 16, 2019
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Acetaldehyde polymerization on Co(0001): the role of CO

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Abstract

The adsorption and polymerization of acetaldehyde (CH3CHO) have been investigated on clean and CO pre-covered Co(0001) surfaces using the temperature programmed desorption (TPD) method. On the clean Co(0001) surface, CH3CHO molecules can polymerize to produce paraldehyde with very low efficiency. With pre-dosed CO molecules on Co(0001), the decomposition of CH3CHO is greatly inhibited. When the coverage of pre-dosed CO is <0.33 ML, no enhancement of CH3CHO polymerization is observed. However, when the pre-dosed CO coverage is >0.33 ML, the polymerization of CH3CHO is significantly enhanced during the TPD process. Further results suggest that CO molecules adsorbed at the bridge/hollow sites may initialize the polymerization by nucleophilic attack of CH3CHO molecules with their O atoms. Moreover, the polymerization product induced by CO molecules is not paraldehyde, but linear polymer chains of CH3CHO at low CH3CHO coverages and probably three dimensional polymer structures at high CH3CHO coverages.

Graphical abstract: Acetaldehyde polymerization on Co(0001): the role of CO

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Publication details

The article was received on 23 Jan 2019, accepted on 27 Feb 2019 and first published on 11 Mar 2019


Article type: Paper
DOI: 10.1039/C9CP00441F
Phys. Chem. Chem. Phys., 2019,21, 8275-8281

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    Acetaldehyde polymerization on Co(0001): the role of CO

    J. Chen, Q. Guo, J. Wu, D. Dai, M. Chen and X. Yang, Phys. Chem. Chem. Phys., 2019, 21, 8275
    DOI: 10.1039/C9CP00441F

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