Effect of Fe-Mo promoters on HZSM-5 zeolite catalyst for 1-hexene aromatization

الملخص EN

The promotional effect of Fe-Mo species introduced into HZSM-5 (Zeolyst Int., SiO2/Al2O3 ≈ 30) zeolite catalyst by the wetness impregnation method for the 1-hexene aromatization was investigated.

The structure and catalytic performance for the aromatization of 1-hexene over xFeyMo-ZSM-5 catalysts in comparison with unmodified HZSM-5 catalysts were studied.

The xFeyMo-ZSM-5 catalysts contain fixed loading (5 wt%) and variable Fe/Mo ratio.

The catalysts were characterized by BET, ICP-AES, HRSEM-EDS, HRTEM, XRD, FTIR, H2-TPR, NH3-TPD, and pyridine DRIFT spectroscopy.

The characterization data confirmed the existence of Fe and Mo species in the zeolite matrix.

With Fe and Mo species implementation to HZSM-5 zeolite, the amount of the acid sites decreased, but the selectivities to C9+ aromatics increased.

The catalyst evaluation was performed at 350 °C for 6 h on-stream at atmospheric pressure using a fixed-bed quartz tube reactor.

The selectivity to products of different carbon number was affected by the Fe/Mo ratio within the zeolite.

It was found the product distribution of grouped fractions of C1–C17+ from the liquid product.

The results indicate that the optimum ratio of Fe/Mo is 1–1.5.

The highest selectivity for gasoline and distillate ranges was obtained for the 2.5wt%Fe2.5wt%Mo- and 3wt%Fe2wt%Mo-ZSM-5 samples, which was higher than that for parent HZSM-5 catalyst.