Abstract
The catalytic performance of Mo-based catalyst supported on HZSM-5 has been studied in the absence of oxygen for methane dehydroaromatization in a fixed-bed continuous flow quartz reactor. The results showed that addition of small amounts of gallium to Mo-H 2SO 4/HZSM-5 catalyst further improved the catalytic performance, and yields of C 2–C 11 hydrocarbons increased from 7.84 to 8.96%. TPR proved that the addition of gallium was advantageous for the reduction of MoO 3 on HZSM-5 zeolite. Meanwhile, the amount of coke formation on Ga-Mo/HZSM-5 catalyst decreased gradually with increasing gallium contents. TPO results suggested that the type of coke, such as active carbon and inert carbon, deposited on Ga-Mo/HZSM-5 catalyst depends considerably on time-on-stream. The more inert carbon was formed on the surface of catalysts with increasing time-on-stream.
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