Synthesis of Ni/Al2O3 catalysts via alkaline polyol method and hydrazine reduction method for the partial oxidation of methane
| Autor: | Mehmet Ali Faruk Öksüzömer, Tuba Gürkaynak Altınçekiç, Ezgi Bayrakdar Ateş |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Morphology
Hydrazine chemistry.chemical_element hydrazine reduction Powder Article Alkaline polyol method Catalysis Supported Ni Catalysts chemistry.chemical_compound nickel Polyol medicine Ni/Al2o3 Catalysts Partial oxidation High-resolution transmission electron microscopy chemistry.chemical_classification Polyvinylpyrrolidone catalytic partial oxidation of methane General Chemistry Cobalt Hydrogen-Production Nickel Particles chemistry Nickel Nanoparticles Solution Combustion Method nanoparticles Synthesis Gas Selectivity medicine.drug Nuclear chemistry |
| Zdroj: | Turkish Journal of Chemistry |
| ISSN: | 1303-6130 1300-0527 |
| Popis: | Nickel catalysts supported on gamma-Al2O3 were synthesized in the presence of polyvinylpyrrolidone (PVP) using both alkaline polyol method and hydrazine reduction method while fixing the weight ratio of [(PVP)]/[Ni(CH3COO)(2)center dot 4H(2)O] at 2. The effects of hydrazine [N2H5OH]/[Ni] and [NaOH]/[Ni] molar ratios on the structural properties of the catalysts were characterized by transmission electron microscopy (HRTEM) and by X-ray diffraction (XRD). The average of monodispersed Ni nanoparticles ranged between 8.0 and 13.0 nm. The catalytic tests were performed for the partial oxidation of methane in the temperature range of 600-800 degrees C under a flow rate of 157,500 L kg(-1) hr(-1) with CH4/O-2 = 2. At the molar ratio of [NaOH]/[Ni] = 2, the resultant nickel nanoparticles on alumina was established completely without impurities; thus, it demonstrated the highest catalytic activity, 88% for CH4 conversion, and H-2 selectivity, 90.60%. The optimum [N2H5OH]/[Ni] ratio was determined as 4.1, which means a good catalytic performance and 89.35% selectivity to H 2 for the partial oxidation of methane. Scientific and Technological Research Council of Turkey, Engineering Research Grant Committee (MAG)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [110M446]; Istanbul University Research FundIstanbul University [10041] This study was supported by The Scientific and Technological Research Council of Turkey, Engineering Research Grant Committee (MAG) through project No: 110M446 and by the Istanbul University Research Fund through project No: 10041. |
| Databáze: | OpenAIRE |
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