Reduction and reoxidation of (111) and (100) oriented cerium oxide islands on Cu(111)
- The conversion of CO2 to methanol is an important process of high industrial potential. It could help solving the greenhouse gas problem (CO2) and further provide methanol which can be used as a synthetic fuel. In order to lower the activation energy barrier of the reactions a catalyst is necessary. We studied the interaction of H2 and CO2 with ultrathin cerium oxide islands on a Cu(111) substrate observed by low-energy electron mircoscopy (LEEM), x-ray absorption spectroscopy (XAS) and resonant photoelectron spectroscopy (RPES). From earlier studies the orientation of the CeOx is known to be decisive for the catalytic activity. In our experiments CeOx(100) is directly compared to CeOx(111) via a side-by-side growth, so that the same conditions prevail during the experiment. At low temperatures no reduction of the CeOx(111) and CeOx(100) were observed. However, at a higher temperature the reduction was activated. Furthermore, we show that the exposure to CO2 leads to the formation of partially reoxidized CeOx and saturation below CeO2The conversion of CO2 to methanol is an important process of high industrial potential. It could help solving the greenhouse gas problem (CO2) and further provide methanol which can be used as a synthetic fuel. In order to lower the activation energy barrier of the reactions a catalyst is necessary. We studied the interaction of H2 and CO2 with ultrathin cerium oxide islands on a Cu(111) substrate observed by low-energy electron mircoscopy (LEEM), x-ray absorption spectroscopy (XAS) and resonant photoelectron spectroscopy (RPES). From earlier studies the orientation of the CeOx is known to be decisive for the catalytic activity. In our experiments CeOx(100) is directly compared to CeOx(111) via a side-by-side growth, so that the same conditions prevail during the experiment. At low temperatures no reduction of the CeOx(111) and CeOx(100) were observed. However, at a higher temperature the reduction was activated. Furthermore, we show that the exposure to CO2 leads to the formation of partially reoxidized CeOx and saturation below CeO2 with progressive CO2 exposure.…
Author: | Linus PleinesORCiD, Francesca GenuzioORCiD, Tevfik Onur MenteşORCiD, Andrea LocatelliORCiD, Jens FaltaORCiD, Jan Ingo FlegeORCiD |
---|---|
URL: | https://www.dpg-verhandlungen.de/year/2019/conference/regensburg/part/o/session/37/contribution/10 |
ISSN: | 0420-0195 |
Title of the source (English): | Verhandlungen der DPG |
Publisher: | Deutsche Physikalische Gesellschaft |
Place of publication: | Bad Honnef |
Document Type: | Conference publication not peer-reviewed |
Language: | English |
Year of publication: | 2019 |
Tag: | conversion of CO2 to methanol; low-energy electron mircoscopy (LEEM); resonant photoelectron spectroscopy (resPES); x-ray absorption spectroscopy (XAS) |
First Page: | 330 |
Last Page: | 330 |
Series ; volume number: | Verhandlungen der DPG (VI) ; 54,4 |
Faculty/Chair: | Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Angewandte Physik und Halbleiterspektroskopie |