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        Production of hydrogen-rich syngas and multiwalled carbon nanotubes by biogas decomposition over zirconia supported iron catalysts

        Manoj Pudukudy,Zahira Yaakob,Khaleeda Mhd Syahri,Qingming Jia,Shaoyun Shan 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-

        A set of Fe/ZrO2 catalysts were successfully synthesized by a facile urea-assisted solid-state combustionmethod, and their catalytic test was evaluated for the thermal decomposition of undiluted-biogas intohydrogen-rich syngas and multiwalled carbon nanotubes (MWCNTs). The as-prepared catalysts werecharacterized by X-Ray diffraction (XRD), Scanning and Transmission electron microscopy (SEM andTEM), Nitrogen-physisorption, X-ray photoelectron spectroscopy and Temperature programmedreduction analyses. The iron was found in the form of hematite and metallic-iron in the fresh andreduced catalysts respectively. A suitable metal-support interaction due to thefine surface dispersion ofiron species on ZrO2 was observed in the catalysts. The N2-physisorption analysis indicated the reducedsurface area of the catalysts after iron loading. However, it does not influence the catalytic efficiency sincethe metal amount and metal-support interaction was determined to play the main role. The Fe/ZrO2catalysts exhibited improved catalytic efficiency. With increasing the amount of iron and increasing thereaction temperature, the CH4 and CO2 conversions were increased significantly. A highest CH4 and CO2conversions of 92% and 89% respectively, with an H2/CO ratio of2.25 were obtained for the 50%Fe/ZrO2catalyst at 900 C. The enhanced catalytic performance could be attributed to thefine-surface dispersionof iron-nanocrystals on ZrO2. Moreover, the MWCNTs were characterized by XRD, SEM, TEM and Ramananalyses for their structural properties.

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