The Effect of Metal Introduced Over ZSM-5 Zeolite for C_9 Heavy Aromatics Hydrodealkylation

摘要

Five different (Bi, Ni, Mo, Pt, H)/ZSM-5 catalysts were tested for hydrodealkylation (HDA), isomerisation, dehydrogenated, cyclistion, and poly-alkyl-aromatics activities. Experiments were performed in a fixed-bed microreactor between 300 deg C and 420 deg C, at a total pressure of 0.8 MPa and a liquid hourly space velocity of 1.0 h~(-1). Pt (Mo)/ZSM-5 catalysts enhanced activity in terms of better balance between metal nanoparticles formed and acid sites. Pt-loading catalysts were the best overall catalysts, producing high C9 alkyl-aromatics (isopropylbenzene) conversion (95.9 percent), high HDA selectivity (92.2 percent), and relatively low reaction temperature. Mo-loading catalysts, despite producing the high conversion, required the higher reaction temperatures.