Catalyst composition

The feed may be purified by contacting with a composition comprising an alumina-based catalyst comprising from about 0 wt% to about 20 wt% of Group I or II cations in the range of Group I or II cations, or a combination thereof, prior to the reaction being performed in the isomerization unit. In some embodiments, the alumina-based catalyst has one or more of the following properties: the pore volume of pores having a pore size less than # imgabs0 # is less than about 15% of the total pore volume; the volume of pores with the pore diameter larger than # imgabs 1 # is smaller than 10% of the total pore volume; the volume median pore diameter is smaller than # imgabs; the volume of water pores is smaller than 1.10 cc/g; and a surface area greater than 160 m2/g. 在异构化单元中进行反应之前，进料可通过与包含氧化铝基催化剂的组合物接触来纯化，该氧化铝基催化剂包含约0重量％至约20重量％第I族或第II族阳离子范围内的第I族或第II族阳离子或其组合。在一些实施方案中，该氧化铝基催化剂具有以下性质中的一个或多个：孔径小于#imgabs0#的孔中的孔体积小于总孔体积的约15％；孔径大于#imgabs1#的孔中的孔体积小于总孔体积的10％；体积中值孔径小于#imgabs2#水孔体积小于1.10cc/g；以及表面积大于160m2/g。