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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 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.