Kinetic study of glycerol hydrodeoxygenation on Al2O3 and NiMo2C/Al2O3 catalysts

A kinetic study of glycerol hydrodeoxygenation (HDO) on NiMo2C/Al2O3 and Al2O3, prepared by sol-gel technique, was carried out in a batch reactor, from 250 degrees C to 285 degrees C, at high glycerol concentration (95wt%). Structural and surface properties of the catalysts were determined by XRD, nitrogen physisorption, TEM and NH3-TPD. Impregnation of alumina with Ni and Mo and subsequent carburization at 730 degrees C increased crystallite sizes and reduced total acidity of the catalyst to 1/3 that of pure alumina. All reactions were well fitted to a zeroth order model. Estimation of reagents mass transport rates suggests no diffusion limitation. Main products were propanediols, ethylene glycol and long-chain molecules from oligomerization reactions, as well as methane, ethane and propane. At this temperature range, long-chain compounds have the highest yields, mainly on alumina.

Automated summary

A kinetic study of glycerol hydrodeoxygenation (HDO) on NiMo2C/Al2O3 and Al2O3 catalysts, prepared by sol-gel technique, was conducted at high glycerol concentration (95wt%) in a batch reactor, from 250 degrees C to 285 degrees C. The catalysts' structural and surface properties were characterized, and it was found that impregnation of alumina with Ni and Mo followed by carburization increased crystallite sizes and reduced total acidity. The reactions followed a zeroth order model and had no diffusion limitation. The main products were propanediols, ethylene glycol, long-chain molecules, as well as methane, ethane, and propane.