Effect of Cu-Co Loading on Catalytic Performance of Cu-Co/TiO2 Catalysts in Step-wise Conversion of CH4 and Syngas

doi:10.7503/cjcu20130442

Abstract

Abstract:

A series of Cu-Co/TiO₂ catalysts with different Cu-Co loadings and Cu/Co mass ratio was prepared by equal volume impregnation. The catalysts performances were investigated for the direct synthesis of C₂⁺ oxygenates from CH₄ and syngas by a step-wise reaction technology. Several techniques, including N₂ physical adsorption-desorption(BET), temperature-programmed reduction of hydrogen(H₂-TPR), X-ray diffraction(XRD), temperature-programmed desorption of hydrogen nitride(NH₃-TPD) and temperature-programmed desorption of CO(CO-TPD) were used to characterize the catalysts. The results show that among all the catalysts, 18%(Cu₁₂-Co₆)/TiO₂ has the highest catalytic activity, the formation rate and selectivity of C₂⁺ oxygenates reached 19.92 mg·g_cat^-1·h^-1 and 67.76%, respectively. It is concluded that there is the interaction between the TiO₂ and the active metal Co-Cu as well as the good dispersion in the catalyst, the catalyst has high activity; Highly dispersed micro-crystal CuO that is conducive to catalytic hydrogenation and dehydrogenation reaction can promote the conversion of CH₄ and syngas. Besides, weak acid and mediate strong acid are beneficial to the conversion of CH₄ and syngas, but strong acid produces inhibitory action to the reaction.

Key words: Cu-Co catalyst, CH₄-Syngas, Step-wise conversion

CLC Number:

O643

TrendMD:

PENG Fen, HUANG Wei, HAN Tao. Effect of Cu-Co Loading on Catalytic Performance of Cu-Co/TiO₂ Catalysts in Step-wise Conversion of CH₄ and Syngas[J]. Chem. J. Chinese Universities, 2013, 34(11): 2587.

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Effect of Cu-Co Loading on Catalytic Performance of Cu-Co/TiO₂ Catalysts in Step-wise Conversion of CH₄ and Syngas

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