n-Butene Synthesis in the Dimethyl Ether-to-Olefin Reaction over Zeolites

Zeolite catalysts that could allow the efficient synthesis of n-butene, such as 1-butene, trans-2-butene, and cis-2-butene, in dimethyl ether (DME)-to-olefin (DTO) reaction were investigated using a fixed-bed flow reactor. The zeolites characterized by N2 adsorption desorption, X-ray diffraction (XRD), thermogravimetry (TG), NH3 temperature-programmed desorption (NH3-TPD). A screening ten available indicated ferrierite zeolite with NH4+ cation showed highest n-butene yield. effect temperature calcination pretreatment method on catalytic performance was studied three suitable topologies. significantly affected DME conversion yield at 773 K. Multiple regression analysis performed to determine correlation between six values obtained adsorption/desorption NH3-TPD analyses, contribution rate strong acid site alone an explanatory variable 69.9%; however, addition micropore volume statistically appropriate, leading increase 76.1%. Insights into mechanism DTO these parameters.