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

Hydroisomerization of n-hexane, n-octane and n-hexadecane has been studied over Pt-containing micro/mesoporous materials obtained by mordenite (MOR) recrystallization in alkaline solution in the presence of cethyltrimethylammonium bromide. The degree of recrystallization was controlled by varying the concentration of NaOH. Micro/mesoporous nanocomposites MOR/MCM-41 with intermediate degree of recrystallization showed remarkably high activity and selectivity in hydroisomerization of n-octane and high selectivity in hydroisomerization of n-hexadecane. The effect is due to high accessibility of the active sites, improved transport of bulky molecules provided by mesopores and optimal size of Pt particles located in mesopores.

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► Micro/mesoporous catalysts (MMC) were synthesized by recrystallization of mordenite.
► Pt/MMC with Pt particles of 3–4 nm were prepared.
► Hydroisomerization of n-hexane, n-octane and n-hexadecane was studied over Pt/ MMC.
► Pt/MOR/MCM-41 showed improved catalytic performance in n-octane hydroisomerization.