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Effect of gallium-modified Al₂O₃ ,TiO₂ and SiO₂ supports on characteristics and catalytic properties of supported cobalt catalysts

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

รายละเอียด

ชื่อเรื่อง : Effect of gallium-modified Al₂O₃ ,TiO₂ and SiO₂ supports on characteristics and catalytic properties of supported cobalt catalysts
นักวิจัย : Orapin Chokpaisan
คำค้น : -
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Chulalongkorn University. Faculty of Engineering , Bunjerd Jongsomjit
ปีพิมพ์ : 2551
อ้างอิง : http://cuir.car.chula.ac.th/handle/123456789/21234
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Thesis (M.Eng.)--Chulalongkorn University, 2008

The study focused on effect of Ga-modified Al₂O₃,TiO₂ and SiO₂ supports on characteristics and catalytic properties of supported cobalt catalyst during CO hydrogenation. Ga was first impregnated onto the supports to produce Ga-modified supports containing 0.2 and 1 wt% of Ga in the final catalyst. Then, Co catalysts having 20 wt% of Co were prepared from those supports by the incipient wetness impregnation method. CO hydrogenation (H₂/CO = 10/1) was also performed to determine the overall activity and selectivity. It revealed that the activities of Co/Al₂O₃ catalysts were higher than those of the Co/SiO2 catalysts. However, activity depended on acid sites of catalyst. Ga modification on Al₂O₃ supports resulted in increased activities. On contrary, addition of Ga onto SiO₂ decreased activities. It was found that Ga modification had a significant impact on the catalyst properties. The reduced Co metal atoms determined by the H₂ chemisorption increased with Ga modification on Al₂O₃, but decreased with Ga modification on SiO₂. However, Ga modification on Al₂O₃ and SiO₂ supports decrease the catalyst deactivation. For the TiO₂ -supported Co catalyst, it was found that the activity decreased dramatically. This was probably due to the catalysts had sulphur on the surface as impurities

บรรณานุกรม :
Orapin Chokpaisan . (2551). Effect of gallium-modified Al₂O₃ ,TiO₂ and SiO₂ supports on characteristics and catalytic properties of supported cobalt catalysts.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Orapin Chokpaisan . 2551. "Effect of gallium-modified Al₂O₃ ,TiO₂ and SiO₂ supports on characteristics and catalytic properties of supported cobalt catalysts".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Orapin Chokpaisan . "Effect of gallium-modified Al₂O₃ ,TiO₂ and SiO₂ supports on characteristics and catalytic properties of supported cobalt catalysts."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2551. Print.
Orapin Chokpaisan . Effect of gallium-modified Al₂O₃ ,TiO₂ and SiO₂ supports on characteristics and catalytic properties of supported cobalt catalysts. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2551.