The physicochemical and catalytic properties of magnesium-containing zeolite catalysts based on MFI-type zeolites (ZSM-5 and CBV) were compared. The presence of larger mesopores volume in MgCBV was found to decrease selectivity towards light olefins. In order to improve the catalytic properties of MgCBV, the effect of SiO2/Al2O3 molar ratio of CBV (SiO2/Al2O3 = 30, 55, 80 and 300) on its physicochemical and catalytic properties in the reaction of the dimethyl ether (DME) into light olefins was studied. Increasing SiO2/Al2O3 molar ratio from 30 to 80, was shown not change practically the DME conversion and olefin selectivity, but under a SiO2/Al2O3 molar ratio of 300, DME conversion significantly reduces, olefin selectivity increases, while the ethylene/propylene ratio decreases twice. By changing residence time, DME conversion increases under high total light olefins selectivity, while the ethylene/propylene ratio raises with increasing residence time.

中文翻译：

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二甲醚在沸石催化剂上转化为轻烯烃：MFI 型沸石性质和 SiO2/Al2O3 摩尔比对催化剂效率的影响

比较了基于 MFI 型沸石（ZSM-5 和 CBV）的含镁沸石催化剂的理化和催化性能。发现在 MgCBV 中存在较大的中孔体积会降低对轻烯烃的选择性。为了提高MgCBV的催化性能，研究了CBV的SiO2/Al2O3摩尔比（SiO2/Al2O3=30、55、80和300）对其在二甲醚（DME）反应中的理化和催化性能的影响。研究了轻质烯烃。将 SiO2/Al2O3 摩尔比从 30 增加到 80，实际上并未改变 DME 转化率和烯烃选择性，但在 SiO2/Al2O3 摩尔比为 300 时，DME 转化率显着降低，烯烃选择性增加，而乙烯/丙烯比降低两次。通过改变停留时间，