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用两种制备方法和不同制备条件制取了八个催化剂、测定了它们的假(颗粒)密度、真(骨架)密度和比表面积,并用程序升温脱附(TPD)表征了酸性质,用催速老化法评价其脱水性能。试验结果表明,制备方法和条件对催化剂的孔结构和表面酸性质均有影响。乙醇脱水制乙烯的活性和稳定性直接受孔结构和表面酸强度及其分布的控制。具有较大的孔和峰Ⅰ/峰Ⅱ比值(TPD图上)的催化剂脱水活性较高、稳定性较好。
Eight catalysts were prepared by two preparation methods and different preparation conditions. Their pseudo (particle) density, true (backbone) density and specific surface area were measured. The properties of the catalysts were characterized by temperature programmed desorption (TPD) Aging method to evaluate its dehydration performance. The experimental results show that the preparation method and conditions have an influence on the pore structure and surface acidity of the catalyst. The activity and stability of ethanol dehydration to ethylene is directly controlled by pore structure and surface acid strength and its distribution. The catalyst with larger pore and peak I / peak II ratios (on the TPD plot) has higher dehydration activity and better stability.