Graphite oxide- and graphene oxide-supported catalysts for microwave-assisted glucose isomerisation in water

Iris K.M. Yu, Xinni Xiong, Daniel C.W. Tsang, Yun Hau Ng, James H. Clark, Jiajun Fan, Shicheng Zhang, Changwei Hu, Yong Sik Ok

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Graphite (G), graphite oxide (GIO), and graphene oxide (GO) were evaluated for the first time as carbonaceous supports to synthesise heterogeneous Lewis acid catalysts, via simple AlCl3 pretreatment followed by one-step thermal modification. The GIO- and GO-supported Al catalysts were active towards catalytic isomerisation of glucose in water as the greenest solvent. The highest fructose yield of 34.6 mol% was achieved under microwave heating at 140 °C for 20 min. The major active sites were characterised as amorphous Al hydroxides (e.g., β-Al(OH)3, γ-Al(OH)3, and γ-AlO(OH)) with octahedral coordination, as revealed by 27Al NMR, XPS, SEM, TEM-EDX, Raman, ESR, and XRD analyses. The transformation of octahedral Al to pentahedral/tetrahedral coordination was observed when the activation temperature increased. Oxygen-containing functional groups on the GIO and GO surfaces, e.g., C-O-C, -OH, and -COOH, contributed to the formation of microwave-absorbing active sites. In contrast, the G-supported catalyst may contain microwave-transparent Al hydroxides, accounting for its low catalytic activity under microwave irradiation. This study elucidates the significance of the surface chemistry of carbonaceous supports in generating active species for a Lewis acid-driven reaction. The revealed intertwined relationships among modification conditions, physicochemical properties, and catalytic performance will be useful for designing effective carbon-supported catalysts for sustainable biorefinery.

Original languageEnglish
Pages (from-to)4341-4353
Number of pages13
JournalGreen Chemistry
Volume21
Issue number16
DOIs
Publication statusPublished - 2019 Jan 1

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Graphite
Isomerization
Catalyst supports
graphite
Oxides
Graphene
Glucose
glucose
catalyst
Microwaves
oxide
Water
Hydroxides
Lewis Acids
water
hydroxide
Fructose
Microwave heating
Microwave irradiation
Acids

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

Cite this

Graphite oxide- and graphene oxide-supported catalysts for microwave-assisted glucose isomerisation in water. / Yu, Iris K.M.; Xiong, Xinni; Tsang, Daniel C.W.; Ng, Yun Hau; Clark, James H.; Fan, Jiajun; Zhang, Shicheng; Hu, Changwei; Ok, Yong Sik.

In: Green Chemistry, Vol. 21, No. 16, 01.01.2019, p. 4341-4353.

Research output: Contribution to journalArticle

Yu, IKM, Xiong, X, Tsang, DCW, Ng, YH, Clark, JH, Fan, J, Zhang, S, Hu, C & Ok, YS 2019, 'Graphite oxide- and graphene oxide-supported catalysts for microwave-assisted glucose isomerisation in water', Green Chemistry, vol. 21, no. 16, pp. 4341-4353. https://doi.org/10.1039/c9gc00734b
Yu, Iris K.M. ; Xiong, Xinni ; Tsang, Daniel C.W. ; Ng, Yun Hau ; Clark, James H. ; Fan, Jiajun ; Zhang, Shicheng ; Hu, Changwei ; Ok, Yong Sik. / Graphite oxide- and graphene oxide-supported catalysts for microwave-assisted glucose isomerisation in water. In: Green Chemistry. 2019 ; Vol. 21, No. 16. pp. 4341-4353.
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