Optimization of O2/CH4 to oxide methane at 823 K by alumina-ceria supported Pt catalysts

Autor:	Fabián S. Mederos-Nieto, Ma. Elena Manríquez-Ramírez, R. Vázquez Medina, Román Ramírez-López, Ignacio Elizalde-Martínez, M. C. Monterrubio-Badillo
Rok vydání:	2019
Předmět:	chemistry.chemical_classification Inorganic chemistry Oxide chemistry.chemical_element Oxygen Catalysis Methane chemistry.chemical_compound Hydrocarbon chemistry Anaerobic oxidation of methane Limiting oxygen concentration Physical and Theoretical Chemistry Space velocity
Zdroj:	Reaction Kinetics, Mechanisms and Catalysis. 128:149-161
ISSN:	1878-5204 1878-5190
Popis:	Methane oxidation was carried out in presence of synthetized Pt/Al2O3–CeO2 catalysts with ceria contents between 1 and 37 mol%, at 823 K, 52,000 h−1 of GHSV, by varying the oxygen concentration from a deficient concentration respect to methane (1 mol:1 mol) up until a 100% excess over the stoichiometric (4 mol:1 mol). The catalysts were characterized by TGA, N2 sorption, XRD, TPR, UV–Vis, TPD-NH3, and ICP for elemental composition, while methane conversion was followed by gas chromatography. It was found that the optimum concentration of oxygen is the stoichiometric one, and, depending on the concentration of ceria in the catalyst, the operation window with defect and excess of oxygen is different. Particularly, at the highest concentration of ceria in the catalyst, the conversion of methane is greater than using other catalytic materials, and this behavior was attributed to the higher concentration of surface ceria, greater oxygen mobility as well as the synergistic ceria-alumina-platinum effect toward hydrocarbon oxidation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5c1a94848cedd06af8dbe8d834f58258 https://doi.org/10.1007/s11144-019-01641-6 Zobrazit plný text záznamu Full text from SpringerLink