The oxidative dehydrogenation of ethane by perovskite type catalysts containing oxides of strontium, cerium and ytterbium

✍ Scribed by O.J. Velle; A. Andersen; K.-J. Jens

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 441 KB
• Volume: 6
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(90)85053-q

✦ Synopsis

Compounds with the general formula SrCe,.,YbxOa.o,5, have been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), temperature programmed reduction (TPR) and BET, and tested for catalytic activity with respect to dehydrogenation of ethane to ethene. XRD indicates that the solubility limit of YbOa in SrCeOs is about 10 %, above which a second phase is formed. Furthermore, Yb:SrCeOs is unstable in the presence of CO2 as it reacts to SrCOs and Yb:Ce02. TPR measurements indicate that Ce may be reduced from tetra-to the trivalent state. BET measurements yielded specific surface areas of approximately lm*/g. The different catalyst compositions were tested in a continous flow tubular reactor with two different partial pressures of oxygen at 500, 600 and 700 "C. A maximum yield of 49 % was obtained at 700 "C. Possible reaction mechanisms are discussed.