Photocatalytic cellulose reforming for H2 and formate production by using graphene oxide-dot catalysts

Van Can Nguyen, Dipak B. Nimbalkar, Le D. Nam, Yuh Lang Lee, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanism of photocatalytic biomass reforming for H2 production is far from fully understood. This study uses functionalized graphene dots with Pt-cocatalyst to reform cellulose in an alkaline solution under 1 sun illumination. Reforming of cellulose is initiated with the peeling of its constituent D-glucose units, which subsequently transform into deprotonated isosaccharinic acid (C6). Further degradation of C6 into molecules C5-C1 proceeds through successive alternation of C-eliminating hydrolysis and photocatalytic oxidation of C6 derivatives. The C6-C1 species are quantitatively identified using chromatography and mass spectroscopy. The end C-containing product is predominantly HCOO rather than HCO3 (or CO2). The photocatalytic oxidation is accompanied by the photocatalytic reduction of water to produce H2. This reforming steadily produced H2 for 6 days with a negligible rate decay, accomplishing 35% of the theoretical ultimate value for the reforming of cellulose. This study elucidates the detailed mechanism in the photocatalytic reforming of cellulose.

Original languageEnglish
Pages (from-to)4955-4967
Number of pages13
JournalACS Catalysis
Volume11
Issue number9
DOIs
Publication statusPublished - 2021 May 7

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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