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Synthesis of carbon nanotubes from natural gas using horizontally continuous rotary reactor system / Mohamad Syazwan Ahmad Zubir

Synthesis of carbon nanotubes from natural gas using horizontally continuous rotary reactor system_Mohamad Syazwan Bin Ahmad Zubir_K4_2013_875005363_NI

Abstract Kajian ini memberi tumpuan kepada sintesis nanotube karbon (CNT) daripada gas asli (NG) menggunakan reaktor putar selanjar. Pemangkin jenis Co- Mo/MgO telah digunakan dalam proses sintesis. Tiga parameter dikaji dalam proses sintesis iaitu suhu tindak balas, nisbah gas asli kepada nitrogen dan masa tindak balas. Ciri-ciri CNT yang terhasil telah dianalisa menggunakan mikroskop transmisi elektron (TEM) dan analisis termogravimetri (TGA). Keputusan menunjukkan bahawa penguraian NG pada suhu 700°C, 800°C dan 900°C bukan sahaja menghasilkan CNT tetapi ia juga menghasilkan nanofiber karbon (CNF). CNT yang dihasilkan mempunyai diameter luar yang lebih kecil (12nm-18nm) berbanding CNF (32nm-44nm). Kaedah gerak balas permukaan (RSM) menunjukkan bahawa hasil karbon dipengaruhi oleh suhu tindak balas dan juga nisbah input NG kepada N2. Dengan menggunakan RSM, jumlah maksimum karbon sebanyak 547.35% diramalkan dapat dihasilkan dengan system reactor beroperasi pada suhu tindak balas 895°C, masa tindak balas 1.95 jam dan nisbah NG:N2 pada 0.61. _________________________________________________________________________________________ The present research focuses on the synthesis of carbon nanotubes (CNT) from natural gas (NG) using continuous rotary reactor system. The catalyst of Co- Mo/MgO was used during the synthesis process. Three operating parameters were studied namely the reaction temperature, ratio of natural gas to nitrogen (NG:N2) and the reaction time. CNT produce were characterized using transmission electron microscope (TEM) and thermogravimetric analysis (TGA). The result shows that the decomposition of NG at 700°C, 800°C and 900°C not only produced the desired CNT but also produced carbon nanofibers (CNF). CNT produced had much smaller outer diameter (12nm-18nm) compared to CNF (32nm-44nm). Response surface methodology (RSM) study shows that the percentage of carbon yield is affected by the reaction temperature and the NG to N2 ratio. Using RSM, the maximum amount of 547.35% of carbon is predicted to produce using the operating reaction temperature of 895°C, reaction time at 1.95hours and NG:N2 ratio at 0.61.

Contributor(s): Mohamad Syazwan Ahmad Zubir - Author Primary Item Type: Thesis Identifiers: Accession Number : 875005363 Language: English Subject Keywords: Carbon nanotubes; semiconducting channels in transistors; thermogravimetric analysis First presented to the public: 7/1/2013 Original Publication Date: 6/5/2018 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Chemical Engineering Citation: Extents: Number of Pages - 94 License Grantor / Date Granted:   / ( View License ) Date Deposited 2018-06-05 15:22:42.11 Date Last Updated 2019-01-07 11:24:32.9118 Submitter: Nor Hayati Ismail

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