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(a) (b) FIGURE 4. Pore distribution of (a) ZSM-5_m and (b) ZSM-5_h/t (a) (b) FIGURE 5. SEM images of (a) ZSM-5_m and (b) ZSM-5_h/t TABLE 2. EDS analysis of ZSM-5 and H/ZSM-5 zeolites Sample Element ( % wt ) Molar Ratio Si Al ZSM-5_m 32.65 0.895 H/ZSM-5_m 28.04 0.765 ZSM-5_h/t 34.32 1.245 H/ZSM-5_h/t 36.515 1.105 O Na of Si/Al 60.845 0.44 35.18 59.000 0.085 35.34 57.490 0.735 26.58 58.165 N/A 31.86 did not extracted many atoms in the framework. EDS analysis also showed that H/ZSM-5_h/t has higher acidity that H/ZSM-5_m because its lower Si/Al molar ratio. Analysis using FTIR instrument was conducted to observe the change of acidity after modification into H/ZSM- 5 zeolite. In this experiment, ammonia gases were used as a probe molecule to observe their acidity. Based on FTIR result (Fig. 6), all H/ZSM-5 samples showed peak at 960, 1600-1650, and 3300 cm-1. Those appearance peaks were specific for N-H vibration from ammonia gases adsorbed in ZSM-5 zeolites [11]. Those peaks did not appear in as- synthesized ZSM-5, indicating that the acidity properties had increase after modification [3]. Catalytic Cracking Test The preliminary catalytic activities of H/ZSM-5 zeolites were tested in micro activity test (MAT) reactor to measure their activity in cracking of heavy crude oil. As a model, n-hexadecane was chosen because it had boiling point in the range of boiling point of heavy crude oil. 020088-4PDF Image | ZSM-5 zeolite using various templates as cracking catalysts
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