Deactivation Mechanism of Cu/SiO2 Catalysts
in the Synthesis of Ethylene Glycol via Methyl Glycolate Hydrogenation
Posted on 2020-06-24 - 15:40
Cu/SiO2 catalysts are
prone to deactivation in the dimethyl
oxalate (DMO) hydrogenation when high content of methyl glycolate
(MG) is produced at a high weight hourly space velocity (WHSV). However,
few research studies have focused on the deactivation mechanism, which
has become the bottleneck for improving the efficiency of the syngas-to-ethylene
glycol (EG) technology. Herein, the deactivation mechanism of copper-based
catalysts in the synthesis of EG was studied with MG hydrogenation
as the model reaction. The stability test results proved that carrier
loss in the form of tetramethoxysilane (TMOS) during the reaction
could destroy the structure of the catalysts to some extent. The aggregation
of copper nanoparticles (NPs) was also one of the reasons for the
deactivation. However, the major factor for the deactivation of the
Cu/SiO2 catalyst was deduced to be carbon deposition. The
weak acid–base sites of the catalyst led to some side reactions
such as alcohol dehydration, condensation, and aromatization via the
intermediate of glycolic aldehyde. Larger molecules were formed and
accumulated in the pores of the catalyst, leading to the carbon deposition,
which caused a rapid deactivation of the catalysts. This deactivation
mechanism provides an important guide to develop a highly stable copper-based
catalyst for the DMO hydrogenation to EG.
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Zhao, Yujun; Kong, Lingxin; Xu, Yuxi; Huang, Huijiang; Yao, Yaqi; Zhang, Jingwei; et al. (2020). Deactivation Mechanism of Cu/SiO2 Catalysts
in the Synthesis of Ethylene Glycol via Methyl Glycolate Hydrogenation. ACS Publications. Collection. https://doi.org/10.1021/acs.iecr.0c01619