Pentose Acting as a Sacrificial Multielectron Source in Photocatalytic Hydrogen Evolution from Water by Pt-doped TiO2

Shiragami, Tsutomu; Tomo, Takayuki; Tsumagari, Hikaru; Yuki, Ryota; Yamashita, Toshiaki; Yasuda, Masahide

doi:10.1246/cl.2012.29

Cited by 32 publications

(17 citation statements)

References 14 publications

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“…The present study showed that saccharides derived from napiergrass could operate effectively as sacrificial agent with the same activity as pentose [5] and glucose [7]. The SSF process poses an advantage in the pentose-production from the standpoints of simplicity of the manufacturing process, shortening of the reaction time, and yield of ethanol.…”

Section: Discussionmentioning

confidence: 58%

“…Therefore, the transformation of pentose into bio-fuels is an unavoidable process in the lignocellulosic biomass conversion. Photocatalytic hydrogen production, using hexose and pentose acting as a sacrificial reagent, is a prospective candidate to transform pentose into bio-fuels [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Although the oxidation pathway of sacrificial saccharides (1) by the hole (h + ) is still unclear, Fu et al have postulated a mechanism by which the h + oxidizes directly with the alcohol moiety of glucose [7]. We have proposed that the h + oxidize the HO − to produce HO radical which oxidize 1 through the hydrogen abstraction from the α-carbon of the alcoholic and formyl groups [5]. Formally the reaction of 1 with four equivalents of HO radical, eliminated one mole of CO 2 and three moles of H 2 O (Equation 2).…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Evolution from Napiergrass by the Combination of Biological Treatment and a Pt-Loaded TiO2-Photocatalytic Reaction

et al. 2011

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Ethanol and pentose were produced from lignocellulosic napiergrass by the simultaneous saccharification and fermentation process (SSF) using hydrolytic enzyme and S. Cerevisiae. After the ethanol was removed, the pentose solution was subjected to photocatalytic hydrogen evolution with Pt-loaded TiO 2 under UV-irradiation. This process converted 100 g of napiergrass into 12.3 g of ethanol and 1.76 g of hydrogen whose total combustion energy of (∆H) was 615 kJ. This was close to the ∆H (639 kJ) of the pentose (13.6 g) and hexose (27.4 g) obtained by the cellulose-saccharification of 100 g of napiergrass.

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Section: Discussionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogen Evolution from Napiergrass by the Combination of Biological Treatment and a Pt-Loaded TiO2-Photocatalytic Reaction

et al. 2011

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“…Der geläufigste Photoktalysator zur PR von Glucose ist Pt/TiO 2 , [11] das ausschließlich UV-Licht absorbiert und dabei Aktivitäten bis zu 1.15 mmol H 2 g cat À1 h À1 [12] und 8.5 %E QE erreicht.…”

Section: Zuckerunclassified

Sonnengetriebene Wasserstofferzeugung aus Lignocellulose

Kuehnel

Reisner

2018

Angewandte Chemie

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Die photokatalytische Reformierung Lignocellulose‐haltiger Biomasse ist eine aufstrebende Methode zur Produktion von erneuerbarem H2. Dieser Prozess verbindet Photooxidation von Biomasse mit photokatalytischer Wasserstoffentwicklung bei Raumtemperatur und Atmosphärendruck. Die Umsetzung von Biomasse ist weniger energieaufwändig als Wasserspaltung und liefert dabei hochreinen H2, ohne dass sich O2 bildet. Die direkte Reformierung von unbehandelter Rohbiomasse birgt das Potenzial, weltweit lokal verfügbares Material als kostengünstige Energiequelle zu nutzen.

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“…Therefore, the selection of sacrificial agents will strongly affect the efficiency of the hydrogen evolution. Recently, we have found that sacrificial agents with all of the carbon attached the hydroxy groups such as saccharides (e.g., glucose and xylose) and polyalcohols (l,2-ethandiol, glycerol, arabitol) and continued to serve as an electron source until their sacrificial ability was exhausted in the photocatalytic hydrogen evolution by Pt-loaded TiO 2 (Pt/TiO 2 ) [6][7][8]. Thus, it was found that a neighboring oxygen-atom substituted at β-position strongly assisted the decarboxylation from alcoholic sacrificial agents [8].…”

Section: Introductionmentioning

confidence: 99%

Neighboring Hetero-Atom Assistance of Sacrificial Amines to Hydrogen Evolution Using Pt-Loaded TiO2-Photocatalyst

et al. 2014

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Photocatalytic H 2 evolution was examined using Pt-loaded TiO 2 -photocatalyst in the presence of amines as sacrificial agents. In the case of amines with all of the carbon attached to the hetero-atom such as 2-aminoethanol, 1,2-diamonoethane, 2-amino-1,3-propanediol, and 3-amino-1,2-propanediol, they were completely decomposed into CO 2 and water to quantitatively evolve H 2 . On the other hand, the amines with both hetero-atoms and one methyl group at the β-positions (neighboring carbons) of amino group such as 2-amino-1-propanol and 1,2-diaminopropane were partially decomposed. Also, the photocatalytic H 2 evolution using amines without the hetero-atoms at the β-positions such as ethylamine, propylamine, 1-butylamine, 1,3-diaminopropane, 2-propylamine, and 2-butylamine was inefficient. Thus, it was found that the neighboring hetero-atom strongly assisted the degradation of sacrificial amines. Moreover, rate constants for H 2 evolution were compared among amines. In conclusion, the neighboring hetero-atom did not affect the rate constants but enhanced the yield of hydrogen evolution.

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Pentose Acting as a Sacrificial Multielectron Source in Photocatalytic Hydrogen Evolution from Water by Pt-doped TiO2

Abstract: Photocatalytic reaction was performed by irradiation of Pt-doped TiO2 in an aqueous solution of xylose acting as a sacrificial reagent to evolve hydrogen, whose amounts reached 8.6 equivalents to the xylose used.

Cited by 32 publications

References 14 publications

Hydrogen Evolution from Napiergrass by the Combination of Biological Treatment and a Pt-Loaded TiO2-Photocatalytic Reaction

Hydrogen Evolution from Napiergrass by the Combination of Biological Treatment and a Pt-Loaded TiO2-Photocatalytic Reaction

Sonnengetriebene Wasserstofferzeugung aus Lignocellulose

Neighboring Hetero-Atom Assistance of Sacrificial Amines to Hydrogen Evolution Using Pt-Loaded TiO2-Photocatalyst

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