title: Production of renewable hexanols from mechanocatalytically depolymerized cellulose by using Ir-ReOx /SiO2 catalyst.
abstract: Hexanols were produced in high yield by conversion of cellulose over Ir-ReOx /SiO2 (molar ratio Re/Ir=2) catalyst in biphasic reaction system (n-decane+H2 O). The cellulose was depolymerized by mechanocatalysis with the aid of H2 SO4 . The influence of solvent amount, reaction temperature and hydrogen pressure was systematically investigated and the highest yield of hexanols reached 60 % under the conditions of n-decane/water ∼2 (v/v), 413 K, 10 MPa H2 for 24 h. Mechanocatalytic depolymerization of cellulose with the aid of H2 SO4 or HCl and the use of sufficient n-decane were very crucial for the production of hexanols. H2 SO4 not only catalyzed cellulose to water-soluble oligosaccharides but also promoted the hydrogenolysis activity of Ir-ReOx /SiO2 catalyst. The role of n-decane was to extract hexanols and to suppress over-hydrogenolysis of hexanols to n-hexane.
authors.affiliation: Department of Applied Chemistry, School of Engineering, Tohoku University, Aoba 6-6-07, Aramaki, Aoba-ku, Sendai, 980-8579 (Japan).
authors.forename: Sibao
authors.initials: S
authors.lastname: Liu
authors.forename: Yasuyo
authors.initials: Y
authors.lastname: Okuyama
authors.forename: Masazumi
authors.initials: M
authors.lastname: Tamura
authors.forename: Yoshinao
authors.initials: Y
authors.lastname: Nakagawa
authors.forename: Akio
authors.initials: A
authors.lastname: Imai
authors.forename: Keiichi
authors.initials: K
authors.lastname: Tomishige
mesh_terms: D000473:Alkanes / Q000737:chemistry; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D000441:Hexanols / Q000737:chemistry*; D006851:Hydrochloric Acid / Q000737:chemistry; D007495:Iridium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012211:Rhenium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry
chemical_list: D000473:Alkanes; D000441:Hexanols; D010087:Oxides; D013464:Sulfuric Acids; D007495:Iridium; D012211:Rhenium; D012822:Silicon Dioxide; D002482:Cellulose; C012867:decane; C033158:sulfuric acid; D006851:Hydrochloric Acid
keywords: cellulose; hexanol; hydrogenolysis; iridium; rhenium