Jump to main content
Jump to site search


Metal-acid nanoplates-supported ultrafine Ru nanoclusters for efficient catalytic fractionation of lignin into aromatic alcohols

Abstract

The catalytic fractionation of lignin in native lignocellulose matrix is crucial to the comprehensive achievement of sustainable and green chemicals. Herein, we prepared a novel metal–acid bifunctional nanocomposite of finely scattered metallic Ru nanoclusters (NCs) sustained on porous hafnium phosphate nanoplates (α–HfP NPs) to effectively depolymerise lignocellulosic biomass. A native lignin fraction of pine lignocellulose was promptly depolymerised into 19.86 wt% yield (lignin based) of valuable phenolic monomers (with dihydroeugenol as the main compound in high selectivity) and few cyclic ketones through one-pot catalytic reductive fractionation under mild conditions (190 °C, 3.5 MPa H2). Detailed scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, and temperature-programmed desorption ammonia investigation correlated with the obtained results revealed that the metal–acid synergistic influence and presence of Brønsted acid site in support for dehydration and the well-dispersed metallic role of Ru NCs for hydrodeoxygenation were responsible for the cleavage of lignin-carbohydrate (ester and ether linkages) bonds. Moreover, treating commercial lignin as a substrate in an organic solvent generated 4-hydroxy-3-methoxybenzaldehyde (vanillin) in high yield, as well as other functionalised phenolic monomers up to 85% selectivity, illustrating the high susceptibility of Ru/α-HfP NPs towards C-O bond cleavage through reductive fractionation. Multiple recycling tests of catalyst were performed without apparent loss of activity. Overall, this report highlighted the potential of synthesis strategy of metal–acid supported catalyst to immediately depolymerise untreated biomass and can thus encourage the green, cost-efficient, large-scale production of intermediate chemicals.

Back to tab navigation

Supplementary files

Publication details

The article was received on 03 Nov 2018, accepted on 09 Apr 2019 and first published on 09 Apr 2019


Article type: Paper
DOI: 10.1039/C8GC03440K
Citation: Green Chem., 2019, Accepted Manuscript

  •   Request permissions

    Metal-acid nanoplates-supported ultrafine Ru nanoclusters for efficient catalytic fractionation of lignin into aromatic alcohols

    N. Ullah, A. H. Odda, K. Liang, M. Kombo, S. Sahar, L. Ma, X. X. Fang and A. Xu, Green Chem., 2019, Accepted Manuscript , DOI: 10.1039/C8GC03440K

Search articles by author

Spotlight

Advertisements