The optimum conditions for methanol conversion to dimethyl ether over modified sulfated zirconia catalysts prepared by different methods
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Abstract: Sulfated zirconia (SZ) and two promoted 1%Mn/SZ catalysts which have been prepared via sol gel (Mn/SZ-S) and impregnation (Mn/SZ-I) methods were studied. The morphology of the catalysts was characterized by XRD, BET, NH3-TPD, ICP, SEM and FT-IR analysis. The conversion of methanol to dimethyl ether and hydrocarbons was carried out in the temperature range of 120−300 °C. The Mn/SZ-S showed the highest activity due to the high surface area with suitable acidity. The optimum condition of Mn/SZ-S catalyst was investigated at 200 °C and LHSV of 0.02 h−1 in a time range from 30 to 210 min. It was found that the total conversion decreased from 80.18% to 53.26% at 210 min. The reusability of this catalyst was studied at the optimum condition up till four cycles for 1 h. The characterization of the reused catalyst showed a significant change in the structure and surface acidity due to the blockage of the surface acid sited by carbonaceous materials.
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Key words:
- catalysts /
- dehydration /
- DME /
- sulfate content /
- sulfated zirconia
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Figure 2 Pore size distribution (a), SEM images (b) and NH3-TPD profiles (c) of the fresh catalysts
Figure 3 Variation of methanol conversion with temperature (a), selectivity of DME (b), aromatics (c) and olefins (d) (t = 120−300 °C, LHSV = 0.03 h−1)
Figure 4 The product distribution of methanol conversion as a function of LHSV (a), time (b) on the Mn/SZ-S catalyst
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