Subsequently, the pilot reactor was used to investigate the effects of
the reaction conditions on catalysis. As shown in Table 2, with the
change of reaction temperature, the methanol conversion rate fluctuated
slightly and the selectivity for DMM and byproducts FA and methyl
formate (MF) changed considerably. At 360 °C and 380 °C, far from
equilibrium, the oxidative dehydrogenation of FA from methanol was
thermodynamically favorable20. The higher temperature
was conducive to the activation of the C-H bond of FA by methanol, and
the reaction of methanol with FA converted DMM and DME intermediates
into FA, methanol and MF11. The increase in
temperature led to lower DMM selectivity and higher FA and MF
selectivity.
Table 2 . Catalytic activity of Fe-Mo/HZSM-5 catalyst in
circulating fluidized bed pilot reactor with different temperatures and
methanol/air ratios.