Abstract
A molecular sieve SAPO-34 with high density of strong acid sites was synthesized and its performance in methanol conversion was compared with the performances of ZSM-5, mordenite and beta commercial zeolites. Each catalyst was characterized by X-ray diffraction, X-ray fluorescence, textural analysis (BET method), and temperature programmed desorption of ammonia. The effects of temperature and time of reaction on methanol conversion were evaluated. Among the studied catalysts, SAPO-34 showed the highest initial selectivity to C 2 and C 3 compounds at 450 °C; however, it seems that the high density of strong acid sites of SAPO-34 resulted in an extremely fast deactivation of these sites, giving insignificant light olefins production after 1.5 h of reaction and turning the catalyst highly selective to dimethyl ether. Mordenite showed high selectivity towards C 2 and C 3 compounds at low temperatures, but underwent fast deactivation of its strong acid sites at high temperatures. ZSM-5 and beta zeolites were much more stable and also selective towards C 2 and C 3 compounds, proportionally to their densities of strong acid sites.
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