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Catalytic Cracking of n-Octane over H-ZSM-5 Catalysts: Effect of Calcination and Steam Treatment  

Lee, Hyun-Ju (Department of Chemical Engineering, Chungbuk National University)
Shin, Chae-Ho (Department of Chemical Engineering, Chungbuk National University)
Choi, Won Choon (New Chemistry Research Division, Korea research Institute of Chemical Technology)
Lee, Chul Wee (New Chemistry Research Division, Korea research Institute of Chemical Technology)
Park, Yong Ki (New Chemistry Research Division, Korea research Institute of Chemical Technology)
Publication Information
Korean Chemical Engineering Research / v.46, no.2, 2008 , pp. 291-300 More about this Journal
Abstract
Catalytic cracking of n-octane was carried out over H-ZSM-5 zeolite catalysts after calcination with air and steaming with 100% steam in the temperature range of $550-750^{\circ}C$ for 24 h and compared with the results of thermal cracking. The increase of calcination and steaming temperature resulted in the decrease of surface area, pore volume, and strong acid sites, which was mainly caused by the dealumination of H-ZSM-5 framework. It was found by $^{27}Al$ and $^{29}Si$ MAS NMR that the dealumination was proceeded through the transformation process of tetrahedral framework Al${\rightarrow}$penta-cordinated Al ${\rightarrow}$ octahedral framework Al and the phenomena was much more severe in steaming conditions than that of calcination. In the catalytic cracking of n-octane, as the temperatures of calcination and steaming were increased, the conversion of n-octane, the selectivity of light olefins and ethylene to propylene ratio were decreased due to the dealumination of framework aluminum resulting the loss of acidic strengths. The conversion, selectivity of light olefins and ethylene to propylene ratio reached almost to the level of thermal cracking after steaming at $750^{\circ}C$ for 24 h.
Keywords
Catalytic Cracking; n-Octane; Dealumination; Steam Treatment; H-ZSM-5;
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Times Cited By KSCI : 2  (Citation Analysis)
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