Evaluation of highly active and stable SiO2 supported Fe-based catalysts for the catalytic methane decomposition into COx free hydrogen and CNTs
نویسندگان
چکیده
Catalytic methane decomposition is believed to be an economic and environmental friendly route for the production of COx free hydrogen high quality carbon nanotubes. However, development active stable catalysts remains a significantly challenging research topic. This study focuses on highly silica-supported Fe-based thermal into A series Fe/SiO2 with varying Fe loading in range between 25 wt% 100 were synthesized by solution combustion synthesis (SCS) method. The characterized various bulk sensitive surface analytical tools, such as SEM, XRD, HRTEM, BET Raman spectroscopy. All supported exhibited comparatively activity than unsupported (denoted 100F) catalyst which was least active. Moreover, catalytic terms conversion, rate, growth activities well yields increased increase loading. At operating temperature 650 °C GHSV 8000 h−1, 75FS catalyst, composition 75 wt%Fe/SiO2, demonstrated highest rate 0.75gCH4/g-cat.h among investigated catalysts. Additionally, after achieving initial stability at about 120 min, this remained throughout testing stream 900 min. TEM SEM analysis spent showed that produced multi-walled nanotubes uniform diameters 28 nm Id/Ig ratio 0.454 whereas 100F mainly graphene sheets.
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ژورنال
عنوان ژورنال: Catalysis Communications
سال: 2023
ISSN: ['1566-7367', '1873-3905']
DOI: https://doi.org/10.1016/j.catcom.2023.106703