期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 147, 期 -, 页码 263-270出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2018.11.010
关键词
Hydrogenation catalyst; Hydrothermal carbonization; Levulinic acid; gamma-Valerolactone; Platform chemicals
资金
- JSPS (Japan) [25289272, 16H04549]
- Tohoku University Center for Gender Equality Promotion (TUMUG)
- Grants-in-Aid for Scientific Research [16H04549] Funding Source: KAKEN
Hydrothermal carbonization of glucose (180 degrees C, 4 h) with 5-sulfosalicylic acid and nickel or copper sulfate afforded transition-metal (Ni/NiO, Cu/CuO) functional carbon (FC) catalysts in a single-step without hydrogen gas. Hydrogenation of levulinic acid to y-valerolactone (GVL) in supercritical carbon dioxide (scCO(2))-ionic liquid ([BMIM]Cl) systems with formic acid as H-donor source and Ni/NiO-FC catalysts gave 97% GVL yields (170 degrees C, 3 h). The Ni/NiO-FC catalysts (d = 50 to 200 nm) had well-dispersed Ni/NiO particles ( < 5 nm) with -SO3H, COOH and phenolic - OH functional groups; Ni/NiO-FC catalysts were more effective than Cu/CuO-FC catalysts. Ni/NiO-FC catalysts were active for conversion of substrates (ethyl levulinate, fructose, cellobiose or cellulose) to respective products (GVL, 5-HMF, sugars). The role of scCO(2) in the reaction system is one of improving mass transport and suppressing side-reactions via GVL product removal. Proposed methods for catalyst synthesis and substrate hydrogenation do not require hydrogen gas and are widely applicable to processing biomass.
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