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制备了镁铝共沉淀催化剂,并将其应用于丙酮气固相缩合制备异佛尔酮反应。反应结果表明,在290℃,0.1 MPa,丙酮进料空速为1.0 h-1的反应条件下,该催化剂表现出好的初活性(42%)和主产物选择性(81.4%),但随反应时间的延长,催化剂出现明显的失活。利用XRD、SEM、TG和N2物理吸附等方法对新鲜和失活后催化剂进行表征,发现催化剂的失活与催化剂的结晶度变差,催化剂表面发生的明显团聚和积碳有关。
Magnesium aluminum coprecipitation catalyst was prepared and applied to the isophorone reaction of acetone gas solid-phase condensation. The results showed that the catalyst exhibited good initial activity (42%) and selectivity to the main product (81.4%) under the reaction conditions of 290 ℃, 0.1 MPa and acetone feed space velocity of 1.0 h-1. The reaction time is prolonged, catalyst obvious inactivation. The fresh and inactivated catalysts were characterized by XRD, SEM, TG and N2 physisorption. The results showed that the deactivation of the catalyst was related to the deterioration of the crystallinity of the catalyst and the obvious agglomeration and carbon deposition on the catalyst surface.