Catalytic Decomposition of Methane to Hydrogen and Carbon Nanofibers over Ni−Cu−SiO2 Catalysts

Autor:	Machiraju Subrahmanyam, Jangam Ashok, Akula Venugopal, Padigapati S. Reddy, Gangadhara Raju
Rok vydání:	2008
Předmět:	Hydrogen Carbon nanofiber Coprecipitation General Chemical Engineering Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element Decomposition Methane Catalysis law.invention chemistry.chemical_compound Fuel Technology chemistry law Calcination Carbon Nuclear chemistry
Zdroj:	Energy & Fuels. 23:5-13
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef8003976
Popis:	Highly active and stable Ni−Cu−SiO2 catalysts are prepared by a coprecipitation method and are employed for direct decomposition of methane to hydrogen and carbon nanofibers at 650 °C and atmospheric pressure. The influence of Cu content is investigated over Ni−Cu−SiO2 samples with different Cu/Si ratios. The activity results revealed that a certain amount of Cu could enhance methane decomposition activity of Ni. The influence of catalyst calcination temperature is also explored, and it is concluded that calcination at 450 °C is enough for good catalytic performance of Ni−Cu−SiO2 samples. The physicochemical characteristics of fresh catalysts are characterized by BET-SA, X-ray diffraction (XRD), scanning electron microscopy–energy dispersive X-ray (SEM-EDX), temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) analyses. The deactivated catalysts are analyzed by BET-SA, XRD, Raman, transmission electron microscopy (TEM), and carbon hydrogen nitrogen sulfur (CHNS) techniques. T...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6d972e75fc28638e8cec3b34f7966973 https://doi.org/10.1021/ef8003976 Zobrazit plný text záznamu