Efficient Production of Hydrogen over Supported Cobalt Catalysts from Ethanol Steam Reforming

✍ Scribed by Jordi Llorca; Narcı́s Homs; Joaquim Sales; Pilar Ramı́rez de la Piscina

• Book ID: 112256860
• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 505 KB
• Volume: 209
• Category: Article
• ISSN: 0021-9517
• DOI: 10.1006/jcat.2002.3643

✦ Synopsis

steam reforming occurred to a large degree over ZnO-, La 2 O 3 -, Sm 2 O 3 -, and CeO 2 -supported catalysts; CO-free hydrogen was produced. Samples were characterized after catalytic tests by high-resolution transmission electron microscopy, electron diffraction, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and temperatureprogrammed hydrogen reaction. Depending on the support, different cobalt-based phases were identified: metallic cobalt particles, Co 2 C, CoO, and La 2 CoO 4 . The extent and nature of carbon deposition depended on the sample and on the reaction temperature. ZnO-supported samples showed the best catalytic performances. Under 100% ethanol conversion, selectivity up to 73.8% to H 2 and 24.2% to CO 2 was obtained.