Takashi Nomura
Kyoto University
Hydrogen bondCell wallInfrared heaterNuclear chemistryReactivity (chemistry)CarbonizationOrganic chemistryChemistryMaterials scienceGlycolaldehydeHydroxymethylfurfuralUltravioletBenzophenoneCelluloseCharLevoglucosanFront coverPyrolysisChemical engineeringPolymerizationCoupling reactionNitrogenYield (chemistry)Absorption (chemistry)Molar absorptivityHydrolysis
5Publications
2H-index
7Citations
Publications 5
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#1Takashi Nomura (Kyoto University)H-Index: 2
#2Eiji Minami (Kyoto University)H-Index: 13
Last. Haruo Kawamoto (Kyoto University)H-Index: 37
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Hydrogen bond donor solvents such as aromatic solvents inhibit the secondary degradation of cellulose-derived primary pyrolysis products. In a previous study, we found that the formation of solid carbonized products was completely inhibited during cellulose pyrolysis in aromatic solvents, with 5-hydroxymethylfurfural (5-HMF) recovered in certain yields instead. This indicated that 5-HMF is an intermediate in cellulose carbonization. To confirm this hypothesis, the thermal reactivity of 5-HMF was...
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#1Takashi NomuraH-Index: 2
Last. Haruo KawamotoH-Index: 37
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The fast pyrolysis of cellulose produces levoglucosan (LG), but secondary pyrolysis reactions tend to reduce the yield. The present study assessed the fast pyrolysis of cellulose by infrared (IR) heating under nitrogen flow. Because the nitrogen was not efficiently heated, gaseous LG was immediately cooled, resulting in a maximum yield of 52.7% under optimized conditions. Slow nitrogen flow and a high IR power level provided a greater gas yield by raising the temperature of the cellulose, and th...
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#1Takashi Nomura (Kyoto University)H-Index: 2
#2Eiji Minami (Kyoto University)H-Index: 13
Last. Haruo Kawamoto (Kyoto University)H-Index: 37
view all 3 authors...
This is the first study of cellulose carbonization in the interior of cell walls. Cotton cellulose was pyrolyzed under nitrogen or in aromatic solvents (benzophenone, diphenyl sulfide, and 1,3-diphenoxybenzene) at 280 °C, and cross sections of the cell walls were examined using ultraviolet (UV) microscopy. After pyrolysis under nitrogen, UV absorption caused by carbonization appeared inside the cell walls. The absorptivity of the cell interiors was homogeneous and slightly lower than that of the...
2 CitationsSource
#1Takashi Nomura (Kyoto University)H-Index: 2
#2Haruo Kawamoto (Kyoto University)H-Index: 37
Last. Shiro Saka (Kyoto University)H-Index: 67
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Abstract Aromatic solvents are known to stabilize levoglucosan (1,6-anhydro-β- d -glucopyranose), the major pyrolysis intermediate of cellulose, against thermal degradation including char formation. In this article, pyrolysis of cellulose, a crystalline component of biomass, was investigated in the aromatic solvents 1,3-diphenoxybenzene, diphenyl sulfide, and benzophenone under nitrogen at 280 °C. Thermal degradation of cellulose (Whatman filter paper) was markedly delayed in the aromatic solven...
5 CitationsSource