Reaction temperature controlled selective hydrogenation of dimethyl oxalate to methyl glycolate and ethylene glycol over copper-hydroxyapatite catalysts

•Cu/HAP catalysts are synthesized by a facile AAOPS method.•70% yield of MG could be obtained under 483K.•The selectivity to MG and EG could be adjusted by the reaction temperatures.•The copper phosphate species and the hydroxyl groups play important roles.•High stability is observed. Copper based h...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2015-01, Vol.162, p.483-493
Main Authors: Wen, Chao, Cui, Yuanyuan, Chen, Xi, Zong, Baoning, Dai, Wei-Lin
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Chemistry
Copper
Copper based catalysts
Dimethyl
Dimethyl oxalate
Ethylene glycol
Exact sciences and technology
General and physical chemistry
Hydrogenation
Hydroxyapatite
Methyl glycolate
Oxalates
Silicon dioxide
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:•Cu/HAP catalysts are synthesized by a facile AAOPS method.•70% yield of MG could be obtained under 483K.•The selectivity to MG and EG could be adjusted by the reaction temperatures.•The copper phosphate species and the hydroxyl groups play important roles.•High stability is observed. Copper based hydroxyapatite (HAP) supported (Cu/HAP) catalysts are synthesized by a facile ammonia-assisted one-pot synthesis (AAOPS) method and carefully studied on the selective hydrogenation of dimethyl oxalate (DMO). The Cu/HAP catalysts exhibit different catalytic performance compared with the conventional Cu/SiO2 ones. When the reaction temperatures are set at 483K, the optimal Cu/HAP catalyst displays relatively high and stable catalytic performance with methyl glycolate (MG) as the main product. The yield to MG can reach 70% which is the highest value on the copper based catalysts till now. When the reaction temperature is risen to 513K, the selectivity of the catalysts swifts to the ethylene glycol (EG), and the catalytic behavior is similar to the traditional Cu/SiO2 catalysts. It was found that the copper phosphate species play important roles in stabilizing the copper particles and the Cu+ species. Also, the abundant surface hydroxy groups on the catalysts are responsible for the distinct catalytic performance of the Cu/HAP catalysts.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2014.07.023