Synthesis and Characterization of Silica-Supported Cobalt Phosphide Catalysts for CO Hydrogenation
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Abstract
A series of silica-supported cobalt phosphides with different metal/P molar ratios were synthesized by means of a temperature-programmed reduction (TPR) method. Their catalytic performances of CO hydrogenation were tested in a fixed-bed reactor under conditions of 553 K, 5.0 MPa, and H2/CO = 2 (molar). The catalytic activity of the phosphides ranked in the following order: Co2P/SiO2 < Co4P/SiO2 < Co8P/SiO2 (x denotes the molar ratio of metal to P). It is interesting to find that C2+ oxygenates were the main product over the CoxP catalysts. Evidence from X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM) measurements proved that the Coδ+ species might be the active sites for the formation of higher oxygenates during CO hydrogenation.
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