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Synthesis of methyl isobutyl ketone using Pt-H[Al]ZSM5 bifunctional catalysts. III. Effect of the nPt/nA parameter on the xPt-H[Al]ZSM5(y) catalysts

Abstract:

Synthesis of 4-methyl-2-pentanone, better known as methyl isobutyl ketone (MIBK), from propanone (Ac) was studied in a fixed-bed and a flow reactor at 160°C, 1 atm and an H2/Ac molar ratio equal to 0.33, using Pt-H[Al]ZSM5 bifunctional catalysts with variable platinum percentage and Si/Al ratio. The results show that initial total activity to all measured products at t = 0, per acidic site (A0/nA), residual activity (Ar = A265/A0, ratio of activity after 265 min of stream and the initial total activity to all measured products at t = 0) and initial formation rate of each product per acidic site (R0/nA) largely depend on the relationship between the number of hydro-dehydrogenating metallic sites and the number of theoretical acidic sites (nPt/nA) present in the catalysts used.