论文信息 - Isomerization and hydrocracking of C9 through C16 n-alkanes on Pt/HZSM-5 zeolite

Isomerization and hydrocracking of C9 through C16 n-alkanes on Pt/HZSM-5 zeolite

Abstract The pure n-alkanes with 9 to 16 carbon atoms were converted on a Pt/HZSM-5 zeolite in the presence of hydrogen. The products formed by isomerization and hydrocracking were analyzed by high-resolution capillary GLC. The product distributions differ substantially from those observed earlier on Y type zeolites. Isomerization on Pt/HZSM-5 gives mainly monomethyl isomers. The cracked products consist of n- and i-alkanes with a single methyl branching. Neither methane nor ethane are formed which is indicative of an ionic mechanism of cleavage. The carbon number and isomer distributions of the cracked products are best interpreted in terms of a so-called type C β-scission mechanism combined with secondary isomerization and competitive adsorption at the acidic sites inside the Pentasil channel system.

[1] P. B. Weisz,et al. Transport and reactivity of hydrocarbon molecules in a shape-selective zeolite , 1981 .

[2] Paul B. Weisz,et al. Molecular shape selective catalysis , 1980 .

[3] P. A. Jacobs,et al. Properties of the end members in the Pentasil-family of zeolites: characterization as adsorbents , 1981 .

[4] J. Weitkamp. Isomerization of long-chain n-alkanes on a Pt/CaY zeolite catalyst , 1982 .

[5] N. Chen,et al. Cage effect on product distribution from cracking over crystalline aluminosilicate zeolites , 1969 .

[6] J. Rabo. Zeolite chemistry and catalysis , 1976 .

[7] H. Schulz,et al. Zeolite Catalysts. Hydrocracking and Hydroisomerization of n-Dodecane , 1972 .

[8] J. Martens,et al. Shape-selectivity changes in high-silica zeolites , 1981 .

[9] N. Chen,et al. Some catalytic properties of ZSM-5, a new shape-selective zeolite , 1978 .

[10] W. Haag,et al. Catalysis by crystalline aluminosilicates: Characterization of intermediate pore-size zeolites by the “Constraint Index” , 1981 .

[11] Peter A. Jacobs,et al. Hydroisomerization and hydrocracking. 2. Product distributions from n-decane and n-dodecane , 1981 .

[12] K. Hedden,et al. Reaktionsablauf beim Hydrocracken von n‐Alkanen an Edelmetall/Zeolith‐Katalysatoren , 1975 .