Production of Polyhydric Alcohols from Wood Polysaccharides

Sharkov, V. I.

doi:10.1002/anie.196304051

Cited by 40 publications

(18 citation statements)

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“…266 With noble metals on charcoal in acidic media, high hexitol yields were obtained. 266,267 A few decades later, this catalytic system was translated into a completely heterogeneous system by replacing the mineral acid by a heterogeneous acid catalyst loaded with ruthenium particles. 268 However, due to sintering of the metal particles, the lifetime of the catalyst was limited.…”

Section: Multifunctional Catalysis With Sugar(-derived) Compoundsmentioning

confidence: 99%

Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

et al. 2016

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Increasing demand for sustainable chemicals and fuels has pushed academia and industry to search for alternative feedstocks replacing crude oil in traditional refineries. As a result, an immense academic attention has focused on the valorisation of biomass (components) and derived intermediates to generate valuable platform chemicals and fuels. Zeolite catalysis plays a distinct role in many of these biomass conversion routes. This contribution emphasizes the progress and potential in zeolite catalysed biomass conversions and relates these to concepts established in existing petrochemical processes. The application of zeolites, equipped with a variety of active sites, in Brønsted acid, Lewis acid, or multifunctional catalysed reactions is discussed and generalised to provide a comprehensive overview. In addition, the feedstock shift from crude oil to biomass involves new challenges in developing fields, like mesoporosity and pore interconnectivity of zeolites and stability of zeolites in liquid phase. Finally, the future challenges and perspectives of zeolites in the processing of biomass conversion are discussed.

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Section: Multifunctional Catalysis With Sugar(-derived) Compoundsmentioning

confidence: 99%

Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

et al. 2016

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“…[5] As a result, more recent studies are focused on the development of heterogeneous catalyst systems that allow the direct and selective conversion of cellulose towards selected target products. Although effective, this introduces costly separation and recovery steps.…”

Section: Introductionmentioning

confidence: 99%

“…Although effective, this introduces costly separation and recovery steps. [5] As a result, more recent studies are focused on the development of heterogeneous catalyst systems that allow the direct and selective conversion of cellulose towards selected target products. For example, supported noble-metal A series of polyols, carbohydrates, and cellulose were tested in the aqueous, CuO/ZnO/Al 2 O 3 -catalyzed hydrogenolysis reaction at 245 8C and 50 bar H 2 .…”

Section: Introductionmentioning

confidence: 99%

Hydrogenolysis of Cellulose over Cu‐Based Catalysts—Analysis of the Reaction Network

2014

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A series of polyols, carbohydrates, and cellulose were tested in the aqueous, CuO/ZnO/Al2O3-catalyzed hydrogenolysis reaction at 245 °C and 50 bar H2. The compositions of liquid-phase products were analyzed; based on these results a unified reaction mechanism is proposed that accounts for the observed product distribution. Elementary transformations such as dehydration, dehydrogenation/hydrogenation, Lobry de Bruyn-van Ekenstein isomerization and retro-aldol cleavage were identified as most important for controlling the selectivity of simple polyols and carbohydrates. For cellulose the product distribution is considerably different than for glucose or sorbitol, indicating a change in the reaction pathway. Therefore, next to the traditional hydrolysis of the glycosidic bond, an additional depolymerization mechanism involving only the reducing ends of cellulose oligomers is proposed to account for this observation.

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“…Therefore, renewable resources (e.g., biomass) have been in the center of scientific interest in recent years. [1] Biomass can be converted into high-value compounds and chemical intermediates and has a significant potential to serve as sustainable source of energy and organic carbon. The so called sleeping giant, 5-Hydroxymethylfurfural (HMF), is one of the most valuable building blocks accessible from biomass.…”

Section: Introductionmentioning

confidence: 99%

Cu/MgAl₂O₄ as Bifunctional Catalyst for Aldol Condensation of 5‐Hydroxymethylfurfural and Selective Transfer Hydrogenation

Pupovac

Palkovits

2013

ChemSusChem

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Copper supported on mesoporous magnesium aluminate has been prepared as noble-metal-free solid catalyst for aldol condensation of 5-hydroxymethylfurfural with acetone, followed by hydrogenation of the aldol condensation products. The investigated mesoporous spinels possess high activity as solid-base catalysts. Magnesium aluminate exhibits superior activity compared to zinc and cobalt-based aluminates, reaching full conversion and up to 81 % yield of the 1:1 aldol product. The high activity can be correlated to a higher concentration of basic surface sites on magnesium aluminate. Applying continuous regeneration, the catalysts can be recycled without loss of activity. Focusing on the subsequent hydrogenation of aldol condensation products, Cu/MgAl2 O4 allows a selective hydrogenation and CO bond cleavage, delivering 3-hydroxybutyl-5-methylfuran as the main product with up to 84 % selectivity avoiding ring saturation. Analysis of the hydrogenation activity reveals that the reaction proceeds in the following order: CC>CO>CO cleavage>ring hydrogenation. Comparable activity and selectivity can be also achieved utilizing 2-propanol as solvent in the transfer hydrogenation, providing the possibility for partial recycling of acetone and optimization of the hydrogen management.

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Production of Polyhydric Alcohols from Wood Polysaccharides

Cited by 40 publications

References 0 publications

Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

Hydrogenolysis of Cellulose over Cu‐Based Catalysts—Analysis of the Reaction Network

Cu/MgAl₂O₄ as Bifunctional Catalyst for Aldol Condensation of 5‐Hydroxymethylfurfural and Selective Transfer Hydrogenation

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Production of Polyhydric Alcohols from Wood Polysaccharides

Cited by 40 publications

References 0 publications

Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

Hydrogenolysis of Cellulose over Cu‐Based Catalysts—Analysis of the Reaction Network

Cu/MgAl2O4 as Bifunctional Catalyst for Aldol Condensation of 5‐Hydroxymethylfurfural and Selective Transfer Hydrogenation

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Cu/MgAl₂O₄ as Bifunctional Catalyst for Aldol Condensation of 5‐Hydroxymethylfurfural and Selective Transfer Hydrogenation