Portal de Periódicos da CAPES

Relation Between Paraffin Isomerisation Capability and Pore Architecture of Large-Pore Bifunctional Zeolites

1989; Elsevier BV; Linguagem: Inglês

10.1016/s0167-2991(08)60966-0

2542-6613

Johan A. Martens, Mia Tielen, Peter A. Jacobs,

Catalysis for Biomass Conversion

In this study long-chain n-paraffins in the range from nonane to heptadecane were converted over bifunctional zeolite Y, USY, ZSM-3, ZSM-20 and BETA catalysts in the presence of hydrogen. n-Paraffins can be selectively converted into branched isomers, provided the hydrogenation-dehydrogenation function is in balance with the acid function of the catalyst. The equilibration of the two catalytic functions depends on the catalyst as well as on the carbon number of the feed. For each zeolite there exists an optimum loading with noble metal which depends on the chain length of the n-paraffin feed. If the geometry and dimensions of the zeolite pores are such that hydrocracking is suppressed by molecular shape-selectivity, the yield of isomerisation is improved substantially. The presence of mesopores in zeolite Y crystals is reflected in the isomerisation yield.