- Catalytic Hydrodeoxygenation of High Carbon Furylmethanes to Renewable Jet-fuel Ranged Alkanes over a Rhenium-Modified Iridium Catalyst
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Renewable jet-fuel-range alkanes are synthesized by hydrodeoxygenation of lignocellulose-derived high-carbon furylmethanes over ReOx-modified Ir/SiO2 catalysts under mild reaction conditions. Ir?ReOx/SiO2 with a Re/Ir molar ratio of 2:1 exhibits the best performance, achieving a combined alkanes yield of 82–99 % from C12–C15 furylmethanes. The catalyst can be regenerated in three consecutive cycles with only about 12 % loss in the combined alkanes yield. Mechanistically, the furan moieties of furylmethanes undergo simultaneous ring saturation and ring opening to form a mixture of complex oxygenates consisting of saturated furan rings, mono-keto groups, and mono-hydroxy groups. Then, these oxygenates undergo a cascade of hydrogenolysis reactions to alkanes. The high activity of Ir?ReOx/SiO2 arises from a synergy between Ir and ReOx, whereby the acidic sites of partially reduced ReOx activate the C?O bonds of the saturated furans and alcoholic groups while the Ir sites are responsible for hydrogenation with H2.
- Liu, Sibao,Dutta, Saikat,Zheng, Weiqing,Gould, Nicholas S.,Cheng, Ziwei,Xu, Bingjun,Saha, Basudeb,Vlachos, Dionisios G.
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- Synthesis of high-quality diesel with furfural and 2-methylfuran from hemicellulose
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Hydroxyalkylation-alkylation (HAA) coupled with hydrodeoxygenation is a promising route for the synthesis of renewable high-quality diesel or jet fuel. In this work, a series of solid-acid catalysts were firstly used for HAA between lignocellulose-derived furan and carbonyl compounds. Among the investigated catalysts, Nafion-212 resin demonstrated the highest activity and stability. Owing to the high activity of the reactants and the advantage in industrial integration, the HAA of 2-methylfuran (2-MF) and furfural can be considered as a prospective route in future applications. Catalyst loading, reaction temperature, and time had evident effects on the HAA of 2-MF and furfural over Nafion-212 resin. Finally, the HAA product of 2-MF and furfural was hydrogenated over a Pd/C catalyst and hydrodeoxygenated over Pt-loaded solid-acid catalysts. Pt/zirconium phosphate (Pt/ZrP) was found to be the best catalyst for hydrodeoxygenation. Over the 4 % Pt/ZrP catalyst, a 94 % carbon yield of diesel and 75 % carbon yield of C15 hydrocarbons (with 6-butylundecane as the major component) was achieved. Furfural for all: High-quality diesel is obtained from hemicellulose-derived furfural and 2-methylfuran in a satisfactory yield by the combination of hydroxyalkylation-alkylation and hydrodeoxygenation technologies.
- Li, Guangyi,Li, Ning,Wang, Zhiqiang,Li, Changzhi,Wang, Aiqin,Wang, Xiaodong,Cong, Yu,Zhang, Tao
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- Synthesis of renewable diesel range alkanes by hydrodeoxygenation of furans over Ni/Hβ under mild conditions
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Diesel range branched alkanes were synthesized by the solvent-free hydrodeoxygenation of 5,5′-(butane-1,1-diyl)bis(2-methylfuran), the hydroxyalkylation/alkylation product of 2-methylfuran and butanal. Over the non-noble metal catalyst Ni/Hβ-(394), ~90% carbon yield of diesel range alkanes was achieved at a much lower temperature (503 K) than the temperature (623 K) used in the literature over noble metal catalysts.
- Li, Guangyi,Li, Ning,Yang, Jinfan,Li, Lin,Wang, Aiqin,Wang, Xiaodong,Cong, Yu,Zhang, Tao
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p. 594 - 599
(2014/02/14)
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