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Received March 10, 2012
Accepted May 9, 2012
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Particle size control effect on activity and selectivity of functionalized CNT-supported cobalt catalyst in Fischer-Tropsch synthesis
1Chemical Engineering Department, Amir Kabir University of Technology, 424 Hafez Ave., Tehran 15875-4413, Iran 2Nanotechnology Research Center, Research Institute of Petroleum Industry, Tehran, Iran
banana@aut.ac.ir
Korean Journal of Chemical Engineering, November 2012, 29(11), 1516-1524(9), 10.1007/s11814-012-0062-8
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Abstract
The influence of cobalt particle size on catalyst performance in Fischer-Tropsch synthesis (FTS) has been investigated using functionalized carbon nanotube (CNT)-supported nano catalyst. The catalysts were synthesized by wet impregnation and special sol-gel technique. The catalysts were characterized by BET, XRD, H2 chemisorption, TPR, and TEM. According to TEM analysis, small Co particles (3-8 nm) synthesized by sol-gel technique have very narrow particle size distributions and are mostly confined inside the CNT. The deposition of cobalt nanoparticles synthesized by sol-gel technique on the functionalized CNT shifted the reduction peaks to a low temperature, indicating higher reducibility for uniform cobalt particles. The proposed sol-gel technique increased the FTS rate from 0.62 to 0.71 g HC/gcat./h, C5+ selectivity increased 7% and CH4 selectivity decreased 4%, compared to that prepared by incipient wetness impregnation. This new catalyst preparation method may offer an attractive alternative for nanoparticles synthesis with uniform, and various size distributions.
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References
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Bezemer GL, Radstake PB, Koot V, van Dillen AJ, Geus JW, de Jong KP, J. Catal., 237(2), 291 (2006)
Tavasoli A, Sadagiani K, Khorashe F, Seifkordi AA, Rohani AA, Nakhaeipour A, Fuel Proc. Technol., 9, 491 (2008)
Trepanier M, Tavasoli A, Dalai AK, Abatzoglou N, Fuel Process. Technol., 90(3), 367 (2009)
Trepanier M, Tavasoli A, Dalai AK, Abatzoglou N, Appl. Catal. A: Gen., 353(2), 193 (2009)
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Chen W, Fan ZL, Pan XL, Bao XH, J. Am. Chem. Soc., 130(29), 9414 (2008)
Rashidi AM, Nouralishahi A, Khodadadi AA, Mortazavi Y, Karimi A, Kashefi K, Int. J. Hydrog. Energy., 35, 9489 (2010)
Bezemer GL, van laak A, van Dillen AJ, de Jong KP, Stud.Surf. Sci. Catal., 147, 259 (2004)
Zhang Y, Liu Y, Yang G, Endo Y, Tsubaki N, Catal. Today., 142, 85 (2009)
Naeimi H, Mohajeri A, Moradi L, Rashidi AM, Appl. Surf. Sci., 256(3), 631 (2009)
Bechara R, Balloy D, Vanhove D, Appl. Catal. A: Gen., 207(1-2), 343 (2001)
Huffman GP, Shah N, Zhao J, Huggins FE, Hoost TE, Halvorsen S, Goodwin JG, J. Catal., 151, 17 (1994)
Lin HY, Chen YW, Mater. Chem. Phys., 85(1), 171 (2004)
Martinez A, Lopez C, Marquez F, Diaz I, J. Catal., 220(2), 486 (2003)
Pour AN, Zamani Y, Tavasoll A, Shahri SMK, Taheri SA, Fuel, 87(10-11), 2004 (2008)
Madon RJ, Iglesia E, J. Catal., 139, 576 (1993)
