Data on surface area and porosity are presented in Table 1. It is clear that the HZSM-5 zeolite possessed typical textural properties of microporous materials. The pore volume and size of the catalyst HZSM-5(14) were almost half as com­pared to those of HZSM-5 (80). This showed that a reduction in the aluminum content of the HZSM-5 catalyst affected the material by increasing the poros­ity while simultaneously reduced the total surface area. However, in the case of SBA-15 catalyst (AlSBA-15), significantly larger surface area than HZSM-5 was observed. This confirmed the mesoporous nature of AlSBA-15 that exhibited wider mesopores as suggested by data in Table 1. These findings were in accord­ance with those reported by Kilos et al. (2005) who also observed the mesoporous nature of aluminum-functionalized SBA-15 catalyst.