不同分子筛载体制备的Pt催化剂对正辛烷加氢异构反应的催化性能  

CATALYTIC PERFORMANCE OF THE CATALYSTS SUPPORTED ON DIFFERENT ZEOLITES IN n-OCTANE HYDROISOMERIZATION

作　　者：金昌磊[1,2] 马波[1] 张喜文[2] 凌凤香[2] 秦波[2] 

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001 [2]中国石化抚顺石油化工研究院,辽宁抚顺113001

出　　处：《石油学报（石油加工）》2008年第5期509-514,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油化工股份有限公司项目(090701)资助

摘　　要：分别以Y-β复合分子筛、Y和β的机械混合物、Y、β为载体,制备了Pt系加氢异构催化剂Pt/Y-β、Pt/Y+β、Pt/Y、Pt/β,采用XRD、N2等温吸附-脱附、FT-IR等分析手段进行表征,探讨了其物化性能的差异,并采用固定床反应器考察了上述催化剂对正辛烷加氢异构化反应的催化性能。结果表明,与Pt/Y+β相比,催化剂Pt/Y-β具有较高的相对结晶度、较大的比表面积和孔体积、较高的B酸和L酸,为正碳离子发生骨架异构化和裂化反应提供了条件。230℃时,在Pt系催化剂催化正辛烷加氢异构化反应中,按正辛烷转化率高低排列的催化剂顺序为Pt/Y-β>Pt/β>Pt/Y>Pt/Y+β;按裂解率高低排列的催化剂顺序为Pt/β>Pt/Y-β>Pt/Y+β>Pt/Y;按液体收率高低排列的顺序与裂解率的排列相反;按异辛烷产率高低排列的催化剂顺序为Pt/Y-β>Pt/Y>Pt/β>Pt/Y+β,其中,Pt/Y-β催化剂上单、双支链异辛烷产率分别于230、240℃取得最大值,分别为27.97%、12.54%,明显高于其它催化剂。以双微孔复合分子筛Y-β为载体制备的异构化催化剂Pt/Y-β是具有双重结构的催化剂,具有酸性功能的可调变性、孔道的非单一性,将成为石油加工和石油化学品深加工的新型催化材料。The Pt-containing hydroisomerization catalysts Pt/Y-β, Pt/Y＋β, Pt/Y, Pt/β were prepared by supporting Pt on bimicroporous composite zeolite Y-β, the mixture of Y and β, Y, β, respectively. The physical and chemical properties of the catalysts were characterized by using XRD, N2 absorption-desorption and FT-IR. Then the performance of hydroisomerization of n-octane on these catalysts was studied in a fixed bed stainless steel tubular reactor. It was shown that the relative crystallinity, BET surface area, pore volume, Broensted and Lewis acid sites of Pt/Y-β were higher than that of Pt/Y＋β. In the hydroisomerization of n-octane over these catalysts at 230℃, according to the conversion of n-octane, the cracking ratio, the yield of liquid, the yield of iso-octane, decreasing from high to low, the catalyst order were Pt/Y-β〉Pt/β〉Pt/Y〉Pt/ Y ＋β, Pt/β〉 Pt/Y-β〉 Pt/Y ＋ β〉 Pt/Y , Pt/ Y〉 Pt/ Y ＋β〉 Pt/Y-β〉 Pt/β, Pt/Y-β〉 Pt/Y〉 Ptβ〉 Pt/Y-β, respectively. The yields of mono-branched iso-octane and di-branched iso-octane reached their maximum values of 27.97% and 12.54% at 230, 240℃ over Pt/Y-β, respectively, which were obviously higher than those over other catalysts. Therefore, the hydroisomerization catalyst Pt/Y-β was a catalyst of two different microporous structures, which, with its controllable acidity and non-unique pore size, will probably be the new catalyst applied in petrochemical industry.

关 键 词：含Pt催化剂 复合分子筛 物化性能 正辛烷 加氢异构化 

分 类 号：O643.3[理学—物理化学]