Citation: MAO Dong-Sen, GUO Qiang-Sheng, YU Jun, HAN Lu-Peng, LU Guan-Zhong. Effect of Cerium Addition on the Catalytic Performance of Cu-Fe/SiO₂ for the Synthesis of Lower Alcohols from Syngas[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2639-2645. doi: 10.3866/PKU.WHXB20111125 shu

Effect of Cerium Addition on the Catalytic Performance of Cu-Fe/SiO₂ for the Synthesis of Lower Alcohols from Syngas

1.
Research Institute of Applied Catalysis, School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 200235, P. R. China

Received Date: 25 July 2011
Available Online: 13 September 2011
Fund Project: 上海市科委(08520513600) (08520513600) 上海市教委曙光跟踪计划(10GG23) (10GG23)上海市教委重点学科建设(J51503)资助项目 (J51503)

A series of Ce-Cu-Fe/SiO₂ catalysts with different Ce contents (mole fraction relative to SiO₂, 0-20%) were prepared by co-impregnation and their catalytic performances for CO hydrogenation to lower alcohols were investigated using a continuous flow fixed bed micro-reactor. These catalysts were characterized by X-ray diffraction (XRD), N₂-adsorption, temperature-programmed reduction of H₂ (H₂-TPR), Fourier transform infrared of CO adsorption (CO-FTIR), and temperature-programmed desorption of CO (CO-TPD). The results showed that the addition of an appropriate amount of Ce decreased the Cu crystal size and promoted the dispersion of Cu, which greatly increased the amount of adsorbed CO. Additionally, the interaction of doped Ce with Cu increased the associative and dissociate adsorption capacity of CO, which is favorable for the formation of CH_x and the insertion reaction of adsorbed CO to CH_x. Both the activity and alcohol selectivity of the Cu-Fe/SiO₂ catalyst increased under the combined effect of the above-mentioned two aspects. At a Ce content of 10%, the space time yield of lower alcohols improved from 58.0 g·kg^-1·h^-1 over the Cu-Fe/SiO₂ catalyst to 121.0 g·kg^-1·h^-1 over the Ce-Cu-Fe/SiO₂ catalyst at 250 °C, a pressure of 3.0 MPa, a H₂/CO molar ratio of 2, and gas hourly space velocity of 6000 mL·g^-1·h^-1.
- Cerium promoter,
- Cu-Fe/SiO₂ catalyst,
- Syngas,
- Catalytic hydrogenation,
- Lower alcohols
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of Cerium Addition on the Catalytic Performance of Cu-Fe/SiO2 for the Synthesis of Lower Alcohols from Syngas

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通讯作者: 陈斌, bchen63@163.com

Effect of Cerium Addition on the Catalytic Performance of Cu-Fe/SiO₂ for the Synthesis of Lower Alcohols from Syngas