*2.2.2 Scanning electron microscope*

SEM image of NaZSM-5 h (**Figure 2**) shows that NaZSM-5 particles have uniform size in coffin-like shape and the surface of particles is rough. This surface damage indicating mesoporosity were introduced, after the PDDA template was removed by calcinations [14]. Since the XRD pattern for HZSM-5 h that is prepared through ammonium

**Figure 1.** *XRD pattern of ZSM-5 h zeolites.*

**Figure 2.** *SEM image of NaZSM-5 h zeolite with 100.000 magnification.*

exchange and calcination at high temperature is similar to the pattern of NaZSM-5 h, it is presumed that the morphology of the crystals is also unchanged significantly.
