Co-gasification of pretreated palm kernel shell (PKS) and Mukah Balingian (MB) coal and gasification of individual feedstock were carried out in a fixed bed reactor system. The synergistic effect of pretreated feedstock in co-gasification was probed. The results showed that the co-gasification of pretreated biomass and coal samples had a synergistic effect at all blending ratios. The experimental value of co-gasification on 50 % biomass blending ratio generated the highest gas yield of 69.43 % and lowest tar yield of 10.11 %. This was supported with the different of experimental value and calculated mean value (Exp-Cal) that showed the highest synergistic effect on product yield using 50 % biomass blending ratio of the pretreated samples. Thus, the pretreated PKS and MB coal, by which their physical and chemical properties have been enhanced through pretreatment process are suitable to be used in co-gasification.

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