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在考察铂钖催化剂失活与再生的试验中发现,载体氧化铝的孔结构发生了某些变化。它的比表面和孔容下降,细孔减少,粗孔增加。虽然失活催化剂再生后的活性、稳定性恢复到了新鲜催化剂的水平,然而,孔结构的变化并未复原。一般认为,不仅载体的孔结构对催化剂的活性、选择性和寿命是重要的,而且载体的结构稳定性也是不可忽视的。如果催化剂在运转过程中,载体内部的基本粒子发生凝聚或热半融(烧
In examining platinum catalyst deactivation and regeneration experiments found that the pore structure of the carrier alumina has some changes. Its specific surface and pore volume decreased, pores decreased, coarse pores increased. Although the activity after deactivation of the catalyst was restored, the stability was restored to that of the fresh catalyst, however, the change of pore structure was not restored. It is generally believed that not only the pore structure of the support is important for the activity, selectivity and lifetime of the catalyst, but also the structural stability of the support can not be ignored. If the catalyst in operation, the basic particles within the carrier aggregation or hot semi-melting (burning