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  4. 【Publication】CO hydrogenation on group VI metal–ceria catalysts




【Publication】CO hydrogenation on group VI metal–ceria catalysts

CO hydrogenation on group VI metal–ceria catalysts
Takashi Toyoda,Yoshiro Nishihara,Eika W. Qian
Fuel Processing Technology Volume 125, September 2014, Pages 86–93

Ceria-supported chromium, molybdenum, and tungsten catalysts were prepared by impregnation. The prepared catalysts were characterized using N2 adsorption, X-ray diffraction (XRD), the temperature-programmed reduction (H2-TPR), and X-ray photoelectron spectroscopy (XPS) measurements. The catalytic activity in CO hydrogenation was evaluated using a fixed-bed pressurized flow reaction system under the following conditions: 260–300 °C, 5.0 MPa, GHSV of 5000 h− 1, and a H2/CO ratio of 1.0–2.0. The effects of ceria support, group VI metals, and catalyst activation methods on C2 + alcohol synthesis were investigated. The use of ceria supports resulted in a decrease in the selectivity for CO2, and in increases in the selectivity for C2 + alcohols and CO conversion. The selectivity for alcohols on the Mo-based catalysts was higher than those on the corresponding Cr or W-based catalysts. A comparison of the methods of activation for the K005Co0620MoCe catalyst demonstrated that sulfidation produced the highest CO conversion and selectivity for C2 + alcohols, as well as the lowest, hydrocarbon selectivity. XPS and H2-TPR measurements show that the mixed metal sulfide phases, e.g., the Co–Mo–S phase, and the thiol group on the catalysts enhanced the formation of C2 + alcohols.