Citation: QIU Kun-Zan, GUO Wen-Wen, WANG Hai-Xia, ZHU Ling-Jun, WANG Shu-Rong. Influence of Catalyst Structure on Performance of Cu/SiO₂ in Hydrogenation of Methyl Acetate[J]. Acta Physico-Chimica Sinica, ;2015, 31(6): 1129-1136. doi: 10.3866/PKU.WHXB201503272 shu

Influence of Catalyst Structure on Performance of Cu/SiO₂ in Hydrogenation of Methyl Acetate

1.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China

Received Date: 19 January 2015
Available Online: 27 March 2015
Fund Project: 国家自然科学基金(51276166) (51276166)国家科技支撑计划课题(2015BAD15B06) (2015BAD15B06)(B08026)资助 (B08026)

Cu/SiO₂ catalysts for the hydrogenation of methyl acetate (MA) to ethanol were prepared using the urea hydrolysis method. The catalysts were characterized using N₂-physisorption, X-ray diffraction (XRD), temperature-programmed reduction (TPR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The effects of the copper loading and reduction temperature on the catalyst structure and catalytic performance were investigated. Experimental studies of the influence of the copper loading showed that a 20% (mass fraction, w) Cu/SiO₂ catalyst had uniformly dispersed copper particles and a large number of active centers, and therefore gave the best hydrogenation performances among the three catalysts with the copper loadings of 10%, 20%, and 30%, respectively. Then 20% (w) Cu/SiO₂ was reduced at different temperatures (270, 350, and 450 ℃). The results showed that 20% (w) Cu/SiO₂ reduced at 350 ℃ had the best catalytic activity. This was attributed to the homogeneous distribution of copper nanoparticles, and appropriate Cu⁰/(Cu⁰+Cu⁺) molar ratio, which achieved simultaneous dissociation of hydrogen and MA activation. Under the optimum reaction conditions, the MA conversion and ethanol selectivity reached 97.8% and 64.9% (theoretical maximum value: 66.6%), respectively.
- Methyl acetate,
- Ethanol,
- Hydrogenation,
- Cu/SiO₂,
- Urea hydrolysis method,
- Cu⁰/(Cu⁰+Cu⁺) molar ratio
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Influence of Catalyst Structure on Performance of Cu/SiO2 in Hydrogenation of Methyl Acetate

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通讯作者: 陈斌, bchen63@163.com

Influence of Catalyst Structure on Performance of Cu/SiO₂ in Hydrogenation of Methyl Acetate