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采用离子交换法分别制备了铁、钴、镍改性的HZSM-5分子筛催化剂.在连续流动固定床微型反应装置上对催化剂进行了活性评价,结果表明镍改性的催化剂具有较好的低温活性.采用透射电镜(TEM),X射线衍射(XRD),吡啶程序升温脱附(Py-TPD),N2-吸附脱附和程序升温氧化(TPO)等手段对催化剂反应前后的物性进行了表征,结果表明催化剂的表面酸性决定其催化乙醇脱水的性能.镍改性后,降低了催化剂的强酸量、增加了弱酸量,有利于乙醇转化率和乙烯选择性的提高,镍是比较合适的改性金属.以镍改性的HZSM-5为催化剂,对乙醇脱水制乙烯反应的工艺条件进行了优化.
The iron, cobalt and nickel modified HZSM-5 molecular sieve catalysts were prepared by ion exchange method.The activity of the catalyst was evaluated on a continuous flow fixed bed micro-reactor, the results show that the nickel-modified catalyst has good low temperature activity The physical properties of the catalyst before and after the reaction were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Py-TPD, N2 adsorption-desorption and temperature programmed oxidation (TPO) Indicating that the surface acidity of the catalyst determines its performance of ethanol dehydration.Nickel modified, reducing the strong acid amount of the catalyst, increasing the amount of weak acid, is conducive to the conversion of ethanol and ethylene selectivity, nickel is more appropriate modified metal The nickel-modified HZSM-5 was used as catalyst to optimize the process conditions for the dehydration of ethanol to ethylene.