We used a TG-GC combination to get the selectivity of all the products including the accurate quantity of coke deposition on a hierarchically porous SAPO-34/18 zeolite synthesised by our group from the methanol-to-olefins (MTO) process.TG and GC were used to detect the solid and gas phase products respectively. The SEM images in Figure 1 showed that this SAPO-34/18 zeolite has a low Si/Al ratio of 0.11-0.12 and well ordered macropores. The impact of temperature on catalytic performance were carried out, in Figure 2 we can see that at 350oC and 450oC temperature, the selectivities of propylene and ethylene both rise and than drop, however it maintain a high level at 400oC and rising. In the meantime, at 400oC the quantity of coke deposition is the minimum value in this three different tempertures. Considering the high selectivity of propylene and ethylene and slow deactivation rate, 400oC is an ideal MTO process reaction temperature in comparison with 350oC and 450oC for this zeolite catalyst .

Regular of methanol to olefins process on hierarchical SAPO-34/18 zeolite through TG-GC

248th National Meeting (2014)

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