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• W2156048016 abstract "Nickel possess characteristics similar to noble metals, apart from being easily deactivated by carbon deposition and poisoning. In this study, the activity of prepared nickel based catalysts doped with selected elements (Mg, Zr, Mo, Mn, Co, Fe, and Cu) that were presumed to help nickel active sites has been investigated for the CO2 elimination in the presence of H2 in the hopes for a methanation reaction. With the addition of lanthanide series as co-dopant in the catalyst, the synthesized catalysts were tested for its catalytic activity and reproducibility by FTIR spectroscopy. It was found that only several elements can boost CO2 elimination, namely magnesium, cobalt and ferum, with cobalt showing the highest conversion for both ratios, Ni/Co/Pr 60:30:10 and 60:10:30. Furthermore, Ni/Co/Pr with the ratio of 60:30:10 was proven superior as it yielded highest CH4 in the lowest conversion temperature of approximately 350 °C. Further characterization on Ni/Co/Pr with the ratio of 60:30:10 showed the supremacy towards the conversion of CO2 to CH4. Single point BET analysis showed that Ni/Co/Pr did not have any changes in the surface area, as it did not adsorb CO2. This statement is in agreement with the XRD and EDX results obtained whereby there are no traces of carbon deposition. From TPD results showed CO2 desorption peaks at low and high temperature indicated intermediate bonding of CO2 on the surface of the catalyst. This shows the presence of dopant will result in the enhancement of CO2 elimination to a 100%. Abstrak Nikel mempunyai ciri-ciri yang menyamai logam yang mahal (paladium, platinum). Walau bagaimanapun ia mudah terencat dengan kehadiran karbon dan keracunan mangkin. Dalam kajian ini, aktiviti pemangkinan bagi mangkin Ni yang didop dengan bahan pendop terpilih (Mg, Zr, Mo, Mn, Co, Fe, and Cu) untuk meningkatkan keupayaan pemangkinan disamping memberi ketahanan kepada keracunan mangkin dalam proses menukarkan CO2 kepada gas metana. Dengan penambahan praseodymium daripada kumpulan lantanida, mangkin tersebut telah di uji dari segi keupayaan pemangkinan dan ketahanan menggunakan analisis FTIR. Kajian telah mendapati bahawa hanya beberapa elemen sahaja yang boleh menyingkirkan CO2, iaitu magnesium, ferum dan cobalt. Cobalt menunjukkan keupayaan pemangkinan yang tinggi dalam kedua-dua nisbah Ni/Co/Pr 60:30:10 dan 60:10:30. Selain itu, Ni/Co/Pr dengan nisbah 60:30:10 merupakan mangkin yang paling efektif untuk menyingkirkan CO2 disamping menukarkannya kepada CH4 pada suhu lebih kurang 350oC. Kajian pencirian mangkiin menunjukkan bahawa Ni/Co/Pr dengan nisbah 60:30:10 lebih berkesan menukarkan CO2 kepada CH4. Kajian luas permukaan BET menunjukkan bahawa Ni/Co/Pr tidak menunjukkan sebarang perubahan dalam luas permukaan, bermakna ia tidak menyerap CO2. Analisis XRD and EDX menunjukkan tiada perubahan struktur dan tiada karbon terbentuk di atas permukaan mangkin. Analisis TPD menunjukkan puncak penyahjerapan CO2 berada pada kedua-dua suhu yang rendah dan tinggi. Ini menunjukkan terdapat penjerapan CO2 di atas permukaan mangkin. Ini semua menunjukkan peningkatan kepada keupayaan mangkin untuk menyingkirkan CO2 100%." @default.
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• W2156048016 date "2008-01-01" @default.
• W2156048016 modified "2023-09-28" @default.
• W2156048016 title "C02/H2 methanation on nickel oxide based catalyst doped with various elements for the purification of natural gas" @default.
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