PREPARATION OF ZSM-5 ON ELECTROSPUN SILICA FIBER FOR CARBON MONOXIDE HYDROGENATION

Abstract

ZSM-5 synthesis on electrospun silica fiber for carbon monoxide hydrogenation reaction (CO hydrogenation reaction) was prepared by hydrothermal process and characterized by XRD, SEM, EDX, BET, and TPR technique. The influencing parameters of ZSM-5 deposition on electrospun silica fiber were studied by variation of pH in the solution (8-10), hydrothermal time (24-72 h), hydrothermal temperature (170-190 oC), and Si/Al ratio (20-80). The results indicated that the suitable condition for ZSM-5 preparation on electrospun silica fiber was at pH 9, hydrothermal conditions 180 oC for 24 h. An increasing in Si/Al ratio from 20 to 80 results in increase ZSM-5 deposition on electrospun silica fiber. The catalytic properties of electrospun silica fiber, ZSM-5 on electrospun silica fiber (Si/Al ratio from 20-80), commercial silica (porous), and commercial ZSM-5 (porous) with 10%wt of Co were studied by CO hydrogenation reaction with H2:CO ratio of 2:1, space velocity 75 ml/min/g, and reaction temperature 280 oC. The results indicated that increasing of Si/Al ratio from 20 to 80 leads to increasing of %CO conversion from 34.29 to 42.99% whereas %CH4 selectivity tends to decrease from 93.10 to 88.33. The ZSM-5 synthesized on electrospun silica fiber with Si/Al ratio of 80 yielded the highest CO conversion (42.99%) and Si/Al ratio of 20 yielded the highest CH4 selectivity (93.10%).