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Detailed Investigation of Sm 2 O 3 Catalysts with Different Morphologies for Oxidative Coupling of Methane
Author(s) -
Özdemir Hasan
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202101727
Subject(s) - selectivity , nanorod , oxidative coupling of methane , yield (engineering) , catalysis , nanoparticle , methane , materials science , nanofiber , chemical engineering , morphology (biology) , nuclear chemistry , chemistry , nanotechnology , organic chemistry , composite material , engineering , biology , genetics
Sm 2 O 3 catalysts with different morphologies (nanoparticle, nanorod, hollow nanosphere, nanofiber, flower‐like) were synthesized and tested for the oxidative coupling of methane. The results obtained showed that increasing specific surface area reduced the activity, C 2 selectivity and, thus the yield. It was observed that the reaction initiation temperature was dependent on the total or partial oxidation of methane, which produced the heat for the initiation of the reaction. The effect of temperature on catalytic performance was relatively low at lower temperatures (<600 °C) than at higher temperatures (>700 °C). High reaction temperatures (>700 °C) decreased the C 2 selectivity, lower temperatures were found beneficial to achieve higher C 2 selectivity and yield as expected. Hollow nanosphere morphology showed the highest activity and selectivity at 450 °C and yielded 10.5 % C 2 under high space velocity. The highest C 2 yield (11.8 %) was obtained at 600 °C with nanoparticle morphology. Considering the results at the conditions that full oxygen conversion was attained, it was found that the C 2 selectivity and yield decreased with the nanoparticle>flower‐like>nanorod and nanosphere>nanofiber sequence.