Hydrodeoxygenation of glycerol with in situ H-2 formation over Pt catalysts supported on Fe modified Al2O3: effect of Fe loading

作者：Yfanti Vasileia Loukia; Vasiliadou Efterpi S; Sklari Styliani; Lemonidou Angeliki A

来源：Journal of Chemical Technology and Biotechnology, 2017, 92(9): 2236-2245.

DOI：10.1002/jctb.5282

• platinum catalyst
• iron catalysts
• glycerol hydrodeoxygenation
• aqueous phase reforming
• 1,2-propanediol
• stability

BACKGROUND: Glycerol hydrodeoxygenation to 1,2-propanediol is a reaction of commercial and environmental significance. However, the need for hydrogen supply is a main drawback of the process. This study aims at the development of effective catalysts for glycerol hydrodeoxygenation with in situ H-2 formed. Pt/Al2O3 and Pt/Fe2O3-Al2O3 catalysts with different Fe/Pt ratios were synthesized and evaluated. N-2 physisorption, XRD, TPR-H-2, TGA and DRIFTS-CO characterization techniques were used. Main focus was given on catalyst reusability, while a parametric study was also performed.
RESULTS: Fe addition promotes catalysts activity. Characterization showed that there is an electron interaction between Pt and Fe which is responsible for this enhancement. However, Fe/Pt ratio and reduction temperature affect catalyst performance. The increase of Fe loading leads to lower H-2 formation rates but also to more stable catalyst performance. The most promising results were achieved over the Fe richer catalyst which exhibited 51.5% 1,2-propanediol selectivity, 93.8% glycerol conversion, under 3.5MPa N-2, at 250 degrees C, 1 h and pre-reduction at 200 degrees C.
CONCLUSION: The presence of Fe in Pt/Al2O3 catalysts was proved decisive for the combined cycle of glycerol hydrodeoxygenation-aqueous phase reforming. The high activity and the stable performance in aqueous medium may render these materials as suitable catalysts for various liquid phase hydrodeoxygenation reactions.

• 出版日期2017-9