Hua Song

Changing the oxygen mobility in Co/ceria catalysts by Ca incorporation: implications for ethanol steam reforming.

The effect of calcium doping on the performance of Co/CeO(2) catalysts in ethanol steam reforming was examined using various characterization techniques including CO temperature-programmed reduction, O(2) and CO pulse chemisorption, laser Raman spectroscopy, X-ray diffraction, isotopically labeled oxygen exchange, and diffuse reflectance infrared Fourier transform spectroscopy. Characterization results showed Ca incorporation to lead to oxygen vacancies and unit cell expansion in the ceria lattice. The creation of oxygen vacancies, in turn, enhanced the oxygen mobility in ceria-supported Co catalysts. Steady-state reaction studies showed increased TOF and higher H(2) yields over Co catalysts supported on Ca-doped ceria in ethanol steam reforming.

Effect of synthesis parameters on the catalytic activity of Co–ZrO2 for bio-ethanol steam reforming

The effects of synthesis parameters on the activity of Co–ZrO2 catalysts in bio-ethanol steam reforming (BESR) were investigated. The supported catalysts were prepared by incipient wetness impregnation (IWI) and characterized through N2 physisorption, H2 chemisorption, X-ray diffraction, X-ray photoelectron spectroscopy, temperature programmed calcination, temperature programmed reduction, temperature programmed oxidation, thermogravimetric analysis, ethanol pulse chemisorption, and temperature programmed reaction techniques. The synthesis parameters examined include calcination temperature, reduction temperature, and reduction time. The catalyst evolution at different stages of the synthesis process was investigated. The ethanol adsorption and temperature programmed reaction experiments indicated a strong correlation between the catalytic activity and metallic cobalt surface area for the 10 wt% Co–ZrO2 catalyst.