n-Hexane isomerization on Pt/HMOR: effect of platinum content

Abstract

Current specifications for gasoline impose strong restrictions on the content of aromatic compounds. Isomerization of normal paraffins to isoparaffins is considered an important petroleum reaction for the production of clean gasoline to improve its Research Octane Number (RON) and Motor Octane Number (MON). The isoparaffins are considered as an alternative to the use of oxygenated and aromatic compounds, whose maximum contents are subjected to strict regulations in order to protect the environment. In this work, catalysts supported on mordenite were obtained by competitive ion exchange using aqueous solutions of platinum complexes. Different concentrations of platinum were tested for the isomerization of n-hexane. All the catalysts obtained were shown to be selective to the formation of isomers with high-octane number, which are the products of greatest interest in the oil refining industry. The highest conversion and the best selectivity for 2,3-dmC 4 di-branched component, the isomer with the highest octane number, were found with the 1.10 wt% Pt/HMOR.

A comparative study of n-hexane isomerization over solid acids catalysts: Sulfated and phosphated zirconia

“…Isomerization of n-hexane through bifunctional catalytic mechanism: n-C 6 -n-hexane; i-C 6 -i-hexane; n-O 6 -n-hexene; i-O 6 -i-hexene; n-C 6 + , i-C 6 + -carbenium ions [8].…”

“…Besides, the catalytic performance of the Pt/mordenite catalysts depending on the Pt content for the n-hexane isomerization reaction was recently studied, which gave insight into the effect of platinum content [8]. In addition, a series of platinum loaded zeolites (Pt/Hβ, Pt/ /HM and Pt/H-ZSM-5) is tested in the n-hexane isomerization where the first one showed the best activity and selectivity to isomers [9].…”

“…It is obvious that the activity and selectivity depend on the characteristics of the acid and metallic sites [8]. When the catalyst is well balanced, the acid function is the limiting one and the product distribution depends essentially on the acidity and pore structure of the solid acid [8].…”

“…It is obvious that the activity and selectivity depend on the characteristics of the acid and metallic sites [8]. When the catalyst is well balanced, the acid function is the limiting one and the product distribution depends essentially on the acidity and pore structure of the solid acid [8]. The aim of this paper is to compare the physical-chemical properties (surface, structural, textural and morphological) of different sulfated and phosphated zirconia catalysts and assess their efficiency in the reaction of n-hexane isomerization.…”

Comparison of the Acidity of Heteropolyacids Encapsulated in or Impregnated on SBA-15

“…Over the last decades, HPA have been used in numerous acid-catalyzed reactions requiring highly acidic sites such as the skeletal isomerization of n-alkanes [11][12][13][14][15]. This reaction is becoming an important way to produce clean fuels, as it satisfies most of the environmental specification requirements for fuel production as well as provides an efficient way to increase the octane number of motor gasoline [16].…”