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TABLE 1. Surface area analysis of the as-synthesized ZSM-5 zeolites Sample ZSM-5_m ZSM-5_h/t SBET (m2/g) 334.02 293.885 Smikro (m2/g) 334.02 118.382 Smeso (m2/g) - 175.503 Total pore volume (cc/g) 0.2 0.2115 Vmikro (cc/g) Vmeso (cc/g) Average Pore Diameter (nm) 1.729 2.878 0.2 - 0.062 0.1495 (a) (b) FIGURE 1. Diffraction pattern of the as-synthesized ZSM-5 zeolites FIGURE 2. Diffraction pattern of H/ZSM-5 zeolites FIGURE 3. Isotherm adsorption – desorption of ZSM-5 zeolites Figure 4 explained that the presence of PDDAM as secondary template successfully developed hierarchical pores in the as synthesized of ZSM-5_h/t, giving pore size distribution of 2.10 (microporous), 3.98 and 37.63 nm (mesoporous). This mesoporosity is not observed in ZSM-5_m. Furthermore, SEM analysis had been carried out to observe the morphology of the as-synthesized zeolites and the result showed in Fig. 5. The SEM images that all of the as-synthesized ZSM-5 zeolites have hexagonal shape that were specific characteristic of ZSM-5 zeolites [10]. ZSM-5_h/t showed more rough morphological than ZSM-5_m, indicating the presence mesoporous in this sample [8]. Besides, the smaller shape in ZSM-5_h/t showed that this sample has larger surface area than ZSM-5_m. This data was appropriate with surface area analysis. EDS analysis (Table 2) showed the decrement of Na composition before and after modification to H/ZSM-5 zeolites in both the as-synthesized ZSM-5 zeolite, indicating that ion exchange-treatment had been successfully carried out. The decrement of percent weight of Na in correlation with the increasing acidity in all samples. Molar ratio Si/Al of ZSM-5 zeolites and their modification did not changed significantly; indicating that the modification 020088-3PDF Image | ZSM-5 zeolite using various templates as cracking catalysts
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