Catalytic performance of CuO/HZSM-5 in aromatic synthesis from CH₃Br

CuO/HZSM-5 catalysts with 1%-7% CuO loading, which were prepared by incipient wetness impregnation, were used to study catalytic performance in the conversion of CH₃Br to aromatic compounds in a fixed-bed reactor by changing temperature, CH₃Br flow rate and CuO loading. Fresh and used catalysts were characterized by SEM, TEM, XRD, XPS, TG, DSC, N₂ adsorption and desorption, and NH₃-TPD. XRD results showed that CuO was highly dispersed on HZSM-5 and structure of CuO crystals did not change during reaction. NH₃-TPD results showed that 3% (mass) CuO loading increased strong acidity of catalyst. XPS results showed that coke deposition on used CuO/HZSM-5 catalyst was mainly graphite. The highest aromatic yield of 22.3% was achieved at condition of 3% (mass) CuO loading, 360℃ temperature and 240 ml·g^-1·h^-1 GHSV. The 3% (mass) CuO/HZSM-5 maintained stable catalytic activity within 40 h reaction time.