Kinetics of hydrogen activation on ceria–zirconia

Comparative study for low temperature water-gas shift reaction on Pt/ceria catalysts: Role of different ceria supports

“…This results in reduced activation energy. On the basis of the WGS reactions results in this study and the findings in literature [83,[89][90] we can presume that, there can be an indirect relationship between the activation energy and the BET surface area of the ceria support and the lower BET surface area C2 (78 m 2 /g) required higher activation energy than C1 (187 m 2 /g) and C3 (183 m 2 /g).…”

“…al. [89]. Similarly, low energy grain boundary formed in smaller ceria particles also facilitates the formation of defects [52].…”

Isotopic study of the rates of hydrogen provision vs. methanol synthesis from CO2 over Cu–Ga–Zr catalysts

“…The latter postulated that just very weak acidity is sufficient to promote hydrogen migration and, moreover, they actually observed larger migration rates on basic supports, such as ceria and magnesia. More recently, a lack of a correlation between Lewis acidity and H/D exchange was observed by Schimming et al [33] after re-plotting the density of exchangeable H atoms vs. the surface acidity concentration of their ceria-zirconia mixed oxides. It seems reasonable to conclude, then, that a more careful consideration of not only the type and density but also the strength of the acid sites, is still needed to arrive to a more accurate correlation (if any) between acidity and H/D exchange rate.…”

Zurückziehung: Produktion von Methanol und Ethanol aus Methan in einem einzigen Reaktor mit einem Nickeloxid auf Ceroxid‐Zirconiumoxid‐Katalysator

“…[31,32] Die Konzentration von Säurezentren der verschiedenen Katalysatoren wurde mittels FTIR-spektroskopischer Analyse der Adsorption von Pyridin ermittelt. [31,32] Die Konzentration von Säurezentren der verschiedenen Katalysatoren wurde mittels FTIR-spektroskopischer Analyse der Adsorption von Pyridin ermittelt.…”

“…Alle Proben wurden unter Va kuum bei 723 Ka ktiviert und 1h lang Methan bei p = 530 mbar ausgesetzt. [31,36] Während sich die Reduktion des CZ-Trägers in den ersten 4h ereignete,w urden keine Veränderungen des Spektrums Bei Te mperaturen von 373 bis 523 Kw urden keine stabilen Oberflächenspezies beobachtet.…”