Heteropoly acids as efficient acid catalysts in the one-step conversion of cellulose to sugar alcohols

Palkovits, Regina; Tajvidi, Kameh; Ruppert, Agnieszka M.; Procelewska, Joanna

doi:10.1039/c0cc02263b

Cited by 223 publications

(150 citation statements)

References 36 publications

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“…In general, conversion of cellulose to polyols involves hydrolysis of cellulose to glucose over acids, 73 and subsequent hydrogenation of glucose to sorbitol and other polyols. [66][67][68][69][70][71]74 In our reaction, no acid is added or generated during the reaction, and therefore cellulose is not converted. Aer the reaction, cellulose and hemicellulose sediments can be separated out by magnetic ltering of the catalyst.…”

Section: Resultsmentioning

confidence: 99%

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Lignin depolymerization (LDP) in alcohol over nickel-based catalysts via a fragmentation–hydrogenolysis process

Song

Wang

Cai

et al. 2013

Energy Environ. Sci.

816

661

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Valorization of native birch wood lignin into monomeric phenols over nickel-based catalysts has been studied. High chemoselectivity to aromatic products was achieved by using Ni-based catalysts and common alcohols as solvents. The results show that lignin can be selectively cleaved into propylguaiacol and propylsyringol with total selectivity >90% at a lignin conversion of about 50%. Alcohols, such as methanol, ethanol and ethylene glycol, are suitable solvents for lignin conversion. Analyses with MALDI-TOF and NMR show that birch lignin is first fragmented into smaller lignin species consisting of several benzene rings with a molecular weight of m/z ca. 1100 to ca. 1600 via alcoholysis reaction. The second step involves the hydrogenolysis of the fragments into phenols. The presence of gaseous H 2 has no effect on lignin conversion, indicating that alcohols provide active hydrogen species, which is further confirmed by isotopic tracing experiments. Catalysts are recycled by magnetic separation and can be reused four times without losing activity. The mechanistic insights from this work could be helpful in understanding native lignin conversion and the formation of monomeric phenolics via reductive depolymerization. Broader contextNature efficiently synthesizes aromatic structures and deposits them as lignin in plants. Incorporation of catalytic technologies into lignin conversion is a possible option for valorizing the feedstock as a renewable raw material for aromatic chemical production. Use of heterogeneous catalysts facilitates separation and recycling, and has attracted great attention. However, the detailed chemistry between solid catalysts and solid feedstocks still remains unknown because of mass transfer limitations. Herein we report the valorization of native birch wood lignin into monomeric phenols over nickel-based catalysts. High chemoselectivity to aromatic products was achieved by using Ni-based catalysts and common alcohols as solvents. The results show that lignin can be selectively cleaved into propylguaiacol and propylsyringol with total selectivity >90% at a lignin conversion of about 50%. Analysis results show that birch lignin is rst fragmented into smaller lignin species consisting of several benzene rings with a molecular weight of m/z ca. 1100 to ca. 1600 via alcoholysis reaction. The second step involves the hydrogenolysis of the fragments into phenols. This study will greatly contribute to the understanding of the lignin depolymerization reaction and will be interesting for other biomass conversion.

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Section: Resultsmentioning

confidence: 99%

“…† For CD 3 Several studies have reported concurrent hydrogenation of cellulose and hemicellulose into alcohols. [66][67][68][69][70][71] We tested cellulose transformation under the same conditions as LDP. The reaction mixture is analyzed by HPLC.…”

Section: Resultsmentioning

confidence: 99%

Lignin depolymerization (LDP) in alcohol over nickel-based catalysts via a fragmentation–hydrogenolysis process

Song

Wang

Cai

et al. 2013

Energy Environ. Sci.

816

661

View full text Add to dashboard Cite

show abstract

“…Direct conversion of cellulose into sorbitol by hydrogenolysis has been achieved using supported platinum catalysts 6),7),11),29),30) and supported ruthenium catalysts 8),11),13),29),31), 32) . Removal of lignin and hemicellulose by chemical treatment is required to obtain pure cellulose from lignocellulosic biomass.…”

Section: Resultsmentioning

confidence: 99%

One-pot Conversion from Lignocellulosic Biomass to Isosorbide

Yamaguchi

Mimura

Shirai

et al. 2016

J. Jpn. Petrol. Inst.

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“…Noted that the presented yields in the case of recycling experiments were based on the freshly added substrate to allow comparability with reference experiments (88).…”

Section: Hydrolysis Reactionsmentioning

confidence: 99%

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

Heravi

Fard

Faghihi

2013

Green Chemistry Letters and Reviews

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The organic reactions in water, as the most significant green solvent, have attracted much attention due to their unique properties over conventional organic ones. In the catalytic area, heteropoly acids (HPAs) are also promising green solid acids to replace environmentally harmful liquid acid catalysts. Herein, we wish to report the organic reactions catalyzed by HPAs, their salt, and polyoxometalates (POMs) in aqueous systems.

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Heteropoly acids as efficient acid catalysts in the one-step conversion of cellulose to sugar alcohols

Cited by 223 publications

References 36 publications

Lignin depolymerization (LDP) in alcohol over nickel-based catalysts via a fragmentation–hydrogenolysis process

Lignin depolymerization (LDP) in alcohol over nickel-based catalysts via a fragmentation–hydrogenolysis process

One-pot Conversion from Lignocellulosic Biomass to Isosorbide

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

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