Abstract
The effect of Mn-promotion on high surface area Al-pillared montmorillonite (AlMMT) supported Co nanoparticles prepared by hydrothermal method have been investigated. A series of different weight% Mn-promoted Co nanoparticles were prepared and characterized by XRD, TPR, TGA, BET and SEM techniques. An increase in the surface area of MMT is observed with Al-pillaring. Fischer-Tropsch catalytic activity of the as prepared catalysts was studied in a fixed bed micro reactor at <TEX>$225^{\circ}C$</TEX>, <TEX>$H_2/CO$</TEX> = 2 and at 1 atm pressure. The data showed that by the addition of Mn the selectivity of <TEX>$C_1$</TEX> dropped drastically while that of <TEX>$C_2-C_{12}$</TEX> hydrocarbons increased significantly over all the Mn-promoted Co/AlMMT catalysts. The <TEX>$C_{13}-C_{20}$</TEX> hydrocarbons remained almost same for all the catalysts while the selectivity of <TEX>$C_{21+}$</TEX> long chain hydrocarbons decreased considerably with the addition of Mn. The catalyst with 3.5%Mn showed lowest <TEX>$C_{21+}$</TEX> and highest <TEX>$C_2-C_{12}$</TEX> hydrocarbons selectivity due to cracking of long chain hydrocarbons over acidic sites of MMT.
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