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 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.