正庚烷与正十四烷在Pt/SAPO-11催化剂上临氢异构化  

HYDROISOMERIZATION OF n-HEPTANE AND n-TETRADECANE OVER Pt/SAPO-11

作　　者：张飞[1] 耿承辉[1] 高志贤[1] 周敬来[1] 

机构地区：[1]中国科学院山西煤炭化学研究所,山西太原030001

出　　处：《燃料化学学报》2004年第3期340-345,共6页Journal of Fuel Chemistry and Technology

摘　　要：采用连续流动固定床反应装置,研究了0.6%Pt SAPO 11催化剂上正庚烷与正十四烷的临氢异构转化。实验结果表明,在反应温度200℃～420℃,压力0.5MPa,质量空速2.0h-1的反应条件下,两种原料在高转化时均可保持90%以上的异构化选择性。在转化率小于55%时,C7与C14临氢异构所遵循的反应规律是一致的,即异构化和裂解的相对反应速率相同。依据产物分布组成随转化率变化的规律,提出了烷烃在Pt SAPO 11催化剂上加氢转化的反应网络。同时,实验结果支持烷烃异构化反应在分子筛孔道内进行的观点。Hydroisomerization of n-heptane and n-tetradecane over Pt/SAPO-11 catalyst with 0.6% Pt loading was carried out in a fixed-bed, down-flow reactor at 200℃～420℃, 0.5MPa, WHSV of 2.0h-1. Under such conditions, 90% selectivity to isomers was achieved at high n-alkane conversions. When the conversion was less than 55%,C_7 and C_14 followed the same reaction pathway, which means that the relative reaction rates of isomerization to cracking were same for both alkanes. Based on the product distribution, the reaction network of the n-alkane hydroconversion over Pt/SAPO-11 was proposed. Moreover, the results of the catalytic reaction tests strongly suggest that the isomerization of paraffin occurs inside the SAPO-11 channel.

关 键 词：临氢异构 SAPO-11 正庚烷 正十四烷 产物分布 

分 类 号：TQ426.94[化学工程] TE624.47[石油与天然气工程—油气加工工程]