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The mechanism of dimethyl oxalate hydrogenation to ethylene glycol over Cu/SiO2 catalyst was investigated by in situ Fourier transform infrared(FTIR)spectroscopy.It was found that dimethyl oxalate and methyl glycolate proceeded via dissociative adsorption on Cu/SiO2 catalyst,and four main intermediates,CH3OC(O)(O)C-M(1655 cm-1),M-C(O)(O)C-M(1618 cm-1),HOCH2(O)C-M(1682 cm-1)and CH3O-M(2924-2926 cm-1),were identified during the reaction.It was concluded that dimethyl oxalate hydrogenation to ethylene glycol mainly proceeded along the route:dimethyl oxalate →CH3OC(O)(O)C-M→ methyl glycolate →HOCH2(O)C-M→ ethylene glycol.Finally a schematic reaction network was proposed.
The mechanism of dimethyl oxalate hydrogenation to ethylene glycol over Cu / SiO2 catalyst was investigated by in situ Fourier transform infrared (FTIR) spectroscopy. It was found that dimethyl oxalate and methyl glycolate proceeded via dissociative adsorption on Cu / SiO2 catalyst, and four main intermediates , CH3OC (O) (O) CM (1655 cm -1), MC (O) (O) CM (1618 cm -1), HOCH 2 (O) CM (1682 cm -1) and CH3O-M cm-1), were identified that the dimethyl oxalate hydrogenation to ethylene glycol mainly proceeded along the route: dimethyl oxalate → CH3OC (O) (O) CM → methyl glycolate → HOCH2 (O) CM → ethylene glycol .Finally a schematic reaction network was proposed.