Particle size effects in Fischer-Tropsch synthesis by Co catalyst supported on carbon nanotubes |
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Authors: | Ali Nakhaei Pour Elham Hosaini Mohammad Izadyar Mohammad Reza Housaindokht |
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Institution: | Department of Chemistry, Ferdowsi University of Mashhad, P.0. Box 9177948974, Mashhad, Iran |
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Abstract: | The effect of Co particle size on the Fischer-Tropsch synthesis (FTS) activity of carbon nanotube (CNT)-supported Co catalysts was investigated. Microemulsion (using water-to-surfactant molar ratios of 2 to12) and impregnation techniques were used to prepare catalysts with different Co particle sizes. Kinetic studies were performed to understand the effect of Co particle size on catalytic activity. Size-dependent kinetic parameters were developed using a thermodynamic method, to evaluate the structural sensitivity of the CNT-supported Co catalysts. The size-independent FTS reaction rate constant and size-independent adsorption parameter increased with increasing reac-tion temperature. The Polani parameter also depended on catalyst particle size, because of changes in the catalyst surface coverage. |
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Keywords: | Fischer-Tropsch synthesis Co catalysts Carbon nanotubes Size dependent parameters Kinetics |
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