Kinetics of hydroisomerization of C5–C7 alkanes and their mixtures over platinum containing mordenite

Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization

“…For n-hexane feed Pt-modified dealuminated mordenite is considered to be among the best catalysts and an important number of the industrial units for hydroisomerization of C 5 -C 6 cuts are based on this catalyst [1]. However, this catalyst could hardly be applied for the hydroconversion of n-alkanes with longer chain length due to significant diffusion limitations in the pore system of the mordenite [25].…”

“…Thus, all the above observations suggest that the creation of the secondary mesoporosity by recrystallization has different effect on hydroisomerization of n-alkanes with different chain length: -In the case of n-hexane and lower homologies, secondary mesoporous structure creation is not efficient since n-hexane hydroisomerization proceeds without obvious diffusion limitations in the porous system of dealuminated mordenite [25]. -In the case of n-octane and medium chain length hydrocarbons, the catalytic performance can be improved significantly due to the improved transport of bulky molecules, better accessibility of the acid sites and optimized Pt particle size.…”

“…The kinetic studies performed for hydroisomerization of various alkanes and their mixtures over Pt/MOR catalyst pointed that for C 5 -C 6 alkanes in low pressure range (<4 bar) the rate-limiting step is the isomerization reaction on acid sites, while at higher pressures of n-C 6 and for n-alkanes with more than six carbon atoms the reaction is limited by diffusion [25]. The effectiveness factor for transformation of n-hexane over Pt/mordenite calculated basing on Thiele model pointed that only 30-40% of zeolitic pore system is involved in the catalytic reaction [23,24].…”

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

“…Moreover, chlorine compounds must be continuously introduced to maintain a stable acidity and thus the catalytic activity [9]. Several studies related to the use of zeolite bifunctional catalysts have been reported in the literature [9][10][11][12][13]; they do not present any problems of corrosion and are less sensitive to water and particles, such as sulfur, [5,14,15] in the feedstock.…”

Preparation of Highly Active and Dispersed Platinum Nanoparticles on Mesoporous Al‐MCM‐48 and Their Activity in the Hydroisomerisation of n‐Octane

“…Among the noble metals, Pt has been shown to considerably increase the selectivity in favour of isomerisation, and is therefore the most suitable metal for the hydroconversion of n-alkanes. [2] Various catalysts have been reported to be active in the hydroisomerisation of C 7 and longer C 7 chain n-alkanes, including materials based on MoO 3 , [13] Pt-WO 3 -ZrO 2 , [4,[14][15][16][17] Al-MCM-41, [18,19] zeolite-supported Pt, [20][21][22][23] and Pt-silicoaluminophosphates (SAPO) materials [8,9,24] as alternatives to the traditional Pt and Re/Al 2 O 3 catalysts. In particular, compared to microporous zeolites, Al-MCM-41 materials have a moderate acidity, and the incorporation of metallic sites into these materials (e.g.…”