(617ax) Development of Pt/Al2O3 Catalytic System for the Production of Furanic Compounds from Biomass Derived Itaconic Acid
Thus, we introduced the heterogeneous metal catalysts for producing methyl-Î³-butyrolactone (MGBL) and 3-methyltetrahydrofuran (3-MTHF) as target materials. Ruthenium, palladium, platinum and iridium metal loaded catalysts were synthesized by wetness impregnation method with Î³-Al2O3 as support. The activity of the catalyst was measured in batch reactor using 1 g of the catalyst. The IA conversion was carried out in the liquid phase: 0.05 M of IA, 200 ml of 1,4-dioxane solvent and prepared catalyst were placed into the reactor. The reaction pressure was 140 bar H2and the temperature was 260ÂºC and the mixture was stirred with 1000 rpm for 18 hours. In the hydrogenation and dehydration of IA to MGBL and 3-MTHF using synthesized catalyst, methylsuccinc acid (MSA) and methylsuccinic anhydride (MSAN) were produced as intermediate chemicals.
Among the synthesized metal catalysts, Pt catalyst (3 wt.% Pt/Î³-Al2O3) achieved the highest activity on the conversion of IA into 3-MTHF. In order to increase the hydrogenation and dehydration of carbonyl groups (C=O bond) in MSAN and MGBL, we further applied different kinds of Pt metal precursors to the Pt/Î³-Al2O3 catalysts. It is well known that precursors of metal influence the properties of catalyst, which could promote the catalytic activity . Thus, we introduced two kinds of Pt precursors, Pt(NH3)4(NO3)2 and H2PtCl6 on Î³-Al2O3. In the case of chlorided catalyst (H2PtCl6), the chlorine remained after both calcination and reduction pretreatments. Also in this case, the lower 3-MTHF selectivities were exhibited than the case of chloride free catalyst (Pt(NH3)4(NO3)2) in all reduction temperature. These differences resulted from the differences of acidity and the amounts of H2adsorbed on catalyst surface .
As a result, the highest 3-MTHF selectivity (44.1%) was obtained in the Pt catalyst prepared using Pt(NH3)4(NO3)2 precursor reduced at 400oC. The remain chlorine decreased the catalytic activity, and the catalyst based on Pt(NH3)4(NO3)2 showed the highest activity on the hydrogenation and dehydration of carbonyl C=O bond in the MGBL. The additional characterization of catalyst will be performed and discussed. In the production of the chemicals from biomass-derived materials, these catalysts would be used for the active and energy efficient way for selective chemical production.
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