Cu-Fe基双孔载体催化剂结构和低碳醇合成反应性能

doi:10.3866/PKU.WHXB201205213

Abstract

Abstract:

Copper-iron modified bimodal support (M) with different mass fractions of Cu and Fe elements were prepared by an ultrasonic impregnation method. The catalytic performance for higher alcohol syntheses (HAS) was investigated in a fixed-bed flow reactor. Several techniques, including N₂ physical adsorption, temperature-programmed reduction/desorption of hydrogen, (H₂-TPR/TPD) and X-ray diffraction (XRD) were used to characterize the catalysts. The results indicated that the bimodal pore support was formed by the addition of small-pore silica sol into the macroporous silica gel. Increased amounts of small pore silica sol caused a decrease in pore size in the bimodal carrier. An increase in the Fe/Cu molar ratio facilitated the dispersion of CuO, promoted the reduction of CuO and Fe₂O₃ on the surface layers, and enhanced the interaction between the copper and iron species as well as the bimodal support inside the large pores. The copper was well-dispersed on the catalyst and the amount of iron carbides formed was high in catalysts with a high Fe/Cu molar ratio. Increasing the Fe/Cu mass ratio promoted the catalytic activity and thus facilitated the synthesis of higher alcohols. When the Fe/Cu molar ratio was increased to 30/20, the CO conversion and the yield of higher alcohols increased to 46% and 0.21 g·mL^-1·h^-1, respectively. At the same time, the mass ratio of C₂₊OH/CH₃OH reached 1.96.

Key words: Higher alcohols synthesis, Cu-Fe based catalyst, Bimodal pore support, Space-time yield, Selectivity of C₂+OH

MSC2000:

O643

LIU Jian-Guo, DING Ming-Yue, WANG Tie-Jun, MA Long-Long. Structure and Performance of Cu-Fe Bimodal Support for Higher Alcohol Syntheses[J].Acta Phys. -Chim. Sin., 2012, 28(08): 1964-1970.

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Structure and Performance of Cu-Fe Bimodal Support for Higher Alcohol Syntheses

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