Transformation of Methanol to Hydrocarbons using Modified HZSM-5 catalyst

Syed Saif Ali and Hasan Akhtar Zaidi*

Department of Chemical Engineering, Aligarh Muslim University, Aligarh-202002, INDIA.


HZSM-5 catalyst was modified with barium oxide and cadmium oxide and used for the production of hydrocarbons in a fixed bed reactor was investigated. Barium oxide and cadmium oxide content such as 1wt%BaO and 0.1wt%CdO were doped over HZSM-5 and prepared using the wet impregnation technique. It was found the BaO and CdO get dispersed uniformly over the HZSM-5 catalyst. BaO/CdO film directly influences the formation of crystals, catalyst area, pore-volume, and catalyst reaction. 1wt%BaO/0.1wt%CdO-HZSM-5 catalyst was modified by mild dealumination in 1 M oxalic acid solution, named Cd-Ba/HZOX, and exhibited significant improvement in catalyst stability and hydrocarbon yield. The catalyst properties were investigated by XRD, SEM, and BET analysis. The significant products obtained were methane, ethylene, propylene, dimethyl ether, benzene, toluene, ethylbenzene, xylene, isopropyl benzene, ethyl toluene, and trimethyl benzene and tetra methylbenzene [T=673 K, P=1atm and WHSV=9.5 19h-1]. It was investigated that the Cd-Ba/HZOX catalyst showed better stability than the HZSM-5(HZ), 1wt%BaO-HZSM-5 (Ba/HZ), and 1wt%BaO-0.1wt%CdO/HZSM-5 (Cd-Ba/HZ) catalyst, and this study was made based on the effect of run time.

Keywords :HZSM-5, Methanol to hydrocarbons, yield, conversion, deactivation.