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- W2359197392 abstract "A series of HZSM-5 zeolites modified with various contents (0%~20%) of magnesium oxide (MgO) were prepared by impregnating with aqueous solutions of magnesium acetate, and their structural and acidic properties were characterized by X-ray diffraction (XRD), N2-adsorption, X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of ammonia (NH3-TPD) and pyridine adsorption infrared spectroscopy (Py-IR) methods. The direct synthesis of dimethyl ether (DME) from syngas was carried, with two admixed catalysts, Cu-ZnO-Al2O3 / HZSM-5 and Cu-ZnO-Al2O3 / HZSM-5 modified by MgO in a continuous flow pressurized fixed-bed under temperature of 260 ° C, pressure of 4 MPa and gas hourly space velocity of 1500 mL⋅(gcat⋅h) −1 . The results indicate that the modification of HZSM-5 with suitable amount of MgO can significantly enhance the selectivity for DME from 49% to higher than 68%, while the selectivity for the undesired byproducts CO2 and hydrocarbons is decreased from 37.1% and 9.3% to less than 27% and 0.1%, respectively. The decrease in the formation of hydrocarbons and carbon dioxide can be attributed to the significant decline in the amount of strong acid sites, especially the strong Bronsted acid sites induced by the modification with magnesium oxide. Moreover, different from the modified HZSM-5 prepared by using magnesium nitrate as magnesium precursor, the amount of magnesium oxide in a wide range (2.5%~20%) exhibits almost no effect on the performance of the modified HZSM-5 prepared with magnesium acetate as magnesium precursor." @default.
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- W2359197392 date "2008-01-01" @default.
- W2359197392 modified "2023-09-23" @default.
- W2359197392 title "Acidity of Magnesium Oxide Modified HZSM-5 Zeolite and its Application in the Direct Synthesis of Dimethyl Ether from Syngas——The Effect of Magnesium Precursor" @default.
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