Citation: Feng Li, Chun-Shan Lu, Xiao-Nian Li. The effect of the amount of ammonia on the Cu⁰/Cu⁺ ratio of Cu/SiO₂ catalyst for the hydrogenation of dimethyl oxalate to ethylene glycol[J]. Chinese Chemical Letters, ;2014, 25(11): 1461-1465. doi: 10.1016/j.cclet.2014.05.050 shu

The effect of the amount of ammonia on the Cu⁰/Cu⁺ ratio of Cu/SiO₂ catalyst for the hydrogenation of dimethyl oxalate to ethylene glycol

1.
Institute of Industrial Catalysis of Zhejiang University of Technology, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Hangzhou 310032, China

Corresponding author: Chun-Shan Lu,
Received Date: 8 April 2014
Available Online: 19 May 2014

The effect of the amount of precipitant ammonia on the Cu⁰/Cu⁺ ratio of Cu/SiO₂ prepared by the deposition-precipitation method is investigated. Species at different preparation stages, resulted from the amount of ammonia used, are identified by the XRD and FTIR techniques. Chrysocolla together with either copper nitrate hydroxide or copper hydroxide coexist in the uncalcined catalysts. Upon calcination, the latter two species are converted to CuO particles while chrysocolla remains. Following reduction, CuO is transformed to metallic Cu and chrysocolla is converted to Cu₂O. The value of Cu⁰/Cu⁺ ratio can be evaluated using the peak areas in their TPR profiles. Hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG) shows that the selectivity of EG depends on the Cu⁰/Cu⁺ ratio. Catalyst prepared with the addition of ammonia solution at n(NH₃)/n(Cu²⁺)=0.9 for precipitation-deposition gains a more suitable Cu⁰/Cu⁺ ratio upon reduction and thus has a higher selectivity for EG.
- Amount of ammonia,
- Deposition-precipitation,
- Chrysocolla,
- Copper nitrate hydroxide,
- Copper hydroxide,
- DMO hydrogenation
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

The effect of the amount of ammonia on the Cu0/Cu+ ratio of Cu/SiO2 catalyst for the hydrogenation of dimethyl oxalate to ethylene glycol

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通讯作者: 陈斌, bchen63@163.com

The effect of the amount of ammonia on the Cu⁰/Cu⁺ ratio of Cu/SiO₂ catalyst for the hydrogenation of dimethyl oxalate to ethylene glycol