The study of photocatalytic degradation of ethylbenzene was exploited using semiconductor oxide catalysts, titanium dioxide (TiO2), immobilized on an inclined 6 steps fixed bed solar laboratory scale photocatalytic reactor. Percentage degradation of ethylbenzene was investigated at optimum pH 6.0, concentration of 100 mg/L, oxidant (H2O2) of 12 ml, over a batch system using direct sun light with six beakers on a shaker. The results show that the percentage degradation of ethylbenzene on an immobilized reactor has 85.22%, which has a better degradation than that of the batch system using beaker with shaker 55.09%.These may be, the immobilized system has more ability of absorption capacity in the visible region of TiO2 and can thus better utilize photons in the visible range for photocatalytic reactions.