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.

中文翻译：

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不同方法制备的改性硫酸氧化锆催化剂甲醇制二甲醚的最佳条件

摘要 研究了通过溶胶凝胶法(Mn/SZ-S)和浸渍法(Mn/SZ-I)制备的硫酸化氧化锆(SZ)和两种助催化剂的1%Mn/SZ催化剂。通过XRD、BET、NH3-TPD、ICP、SEM和FT-IR分析对催化剂的形貌进行了表征。甲醇向二甲醚和烃类的转化是在 120-300°C 的温度范围内进行的。Mn/SZ-S 表现出最高的活性，因为它具有高表面积和合适的酸度。在 200°C 和 0.02 h-1 的 LHSV 条件下研究了 Mn/SZ-S 催化剂的最佳条件，时间范围为 30 至 210 分钟。发现总转化率在 210 分钟时从 80.18% 下降到 53.26%。在最佳条件下研究了该催化剂的可重复使用性，直至四个循环，每次 1 小时。