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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0.5 MPa，质量空速2.0 h－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。Abstract: 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 ℃, 0.5 MPa, WHSV of 2.0 h－1. Under such conditions, 90% selectivity to isomers was achieved at high n-alkane conversions. When the conversion was less than 55%，C7 and C14 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.
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Key words:
- hydroisomerization /
- SAPO-11 /
- n-heptane /
- n-tetradecane /
- product distribution
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