The chemical properties and BET surface area of natural zeolite is shown in Table 1. In order to examine the
crystalline structure in the natural zeolite, the XRD patterns of sample is shown in Fig. 2. It vary depending on their
mining sites. It can be seen that the main structure of the natural zeolite catalyst was identified to be mordenite.
Most of the peaks observed at 2θ (degree) = 5-35 for the natural zeolite samples can be assigned to be those of
mordenite type crystalline matter as reported by Trisunaryanti et al. [16]. The samples showed relatively broad base
lines. This suggests that the samples contain amorphous and crystalline impurities.