Efficient magnetic recoverable acid-functionalized-carbon catalysts for starch valorization to multiple bio-chemicals

Podolean, Iunia; Anita, Florin; Garcı́a, Hermenegildo; Pârvulescu, Vasile I.; Coman, Simona M.

doi:10.1016/j.cattod.2016.07.007

Cited by 18 publications

(12 citation statements)

References 53 publications

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“…A second type of tested acid-based composites involved the oxidation of the activated carbons followed by their impregnation with triflic acid (Scheme 2). Most probably, the functionalization of the activated carbons surface with triflate groups takes place through a similar mechanism to that proposed by Perego et al [18] and confirmed by Coman et al [19], in which triflic acid reacts with vicinal hydroxyl groups yielding a bipodally anchored triflate to the carrier surface. Moreover, the resulting water from the esterification reaction may be coordinated to the grafted triflate, generating a strongly hydrated triflic acid onto the activated carbon surface, less prone to leaching.…”

Section: Resultssupporting

confidence: 64%

Green catalytic synthesis of phenprocoumon

et al. 2019

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The catalytic potential of triflate-based activated carbon composites has been investigated in phenprocoumon (C3-alkylated compound) synthesis, through the alkylation of 4-hydroxycoumarin with phenyl-ethyl-carbinol. The main reaction products are O-and C3-alkylated compounds. However, O-alkylated product is more easily produced to the detriment of the C3-alkylated compound, the selective synthesis of the last being a challenge in these conditions. Both the conversion of 4-hydroxycoumarin and the selectivity to C3-alkylated compound is highly influenced by the physico-chemical characteristics of the catalysts and the reaction conditions. The highest 4-hydroxycoumarin conversions (16.0-30.0%) and selectivity to phenprocoumon (94.0-99.7%) were achieved with triflate-based activated carbon composites, characterized by the existence of strong Brønsted acid sites, optimal Lewis/Brønsted acid ratio, and bimodal micro-/mesoporosity.

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Section: Resultssupporting

confidence: 64%

Green catalytic synthesis of phenprocoumon

et al. 2019

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“…Due to their remarkably high acidity (H o = −8.2), also preserved in water, niobia-based catalysts were extensively investigated by different research groups, in various transformations of biomass derivatives [ 17 , 18 , 19 , 20 , 21 , 22 ]. The enhancement of both the hydrothermal stability and acidity in aqueous phase reactions through the deposition of niobia on oxide supports (e.g., silica, titania, alumina) is well documented in the literature [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…The enhancement of both the hydrothermal stability and acidity in aqueous phase reactions through the deposition of niobia on oxide supports (e.g., silica, titania, alumina) is well documented in the literature [ 23 ]. Moreover, in the presence of Nb-based carbon nanotubes (CN) catalysts, levulinic acid and glucose were successfully oxidized to SA, with selectivities of 98–99% and 80%, respectively, for a total conversion of the raw material at 180 °C, 10 bar O 2 , and after 6 h [ 21 ]. However, the catalytic performances, expressed in terms of succinic acid yields, were directly correlated to the nature of the catalytic sites which, in turn, has been dictated by the niobia content and the preparation route.…”

Section: Introductionmentioning

confidence: 99%

Nb-Based Zeolites: Efficient bi-Functional Catalysts for the One-Pot Synthesis of Succinic Acid from Glucose

et al. 2017

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The one-pot production of succinic acid from glucose was investigated in pure hot water as solvent using Nb (0.02 and 0.05 moles%)-Beta zeolites obtained by a post-synthesis methodology. Structurally, they are comprised of residual framework Al-acid sites, extra-framework isolated Nb (V) and Nb2O5 pore-encapsulated clusters. The Nb-modified Beta-zeolites acted as bi-functional catalysts in which glucose is dehydrated to levulinic acid (LA) which, further, suffers an oxidation process to succinic acid (SA). After the optimization of the reaction conditions, that is, at 180 °C, 18 bar O2, and 12 h reaction time, the oxidation of glucose occurred with a selectivity to succinic acid as high as 84% for a total conversion.

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“…Near quantitative yield of SA was achieved when the reaction was performed at 180°C for 6 h in the aqueous medium under 10 bar of O 2 pressure. [59] The two carboxylic acid functionalities in SA can be synthetically manipulated to form crucial derivatives. For example, the acid-catalyzed esterification of SA leads to succinate esters.…”

Section: La To Succinic Acid (Sa)mentioning

confidence: 99%

Recent Advances in the Value Addition of Biomass‐Derived Levulinic Acid: A Review Focusing on its Chemical Reactivity Patterns

Dutta

Bhat

2021

ChemCatChem

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Levulinic acid (LA) is one of the most prominent biomass‐derived chemical building blocks that can be transformed into specialty chemicals like fuels, solvents, monomers for polymers, plasticizers, surfactants, agrochemicals, and pharmaceuticals. Over the past three decades, an enormous amount of research data have been acquired on the preparation and downstream value addition of LA, and these works have been reviewed. However, considering the astonishing number of publications appearing every year on LA derivatives, the periodical review of recent works focusing on unique aspects of chemistry must be undertaken to critically evaluate the achievements to date, reassess the challenges, and recognize new opportunities. This review discusses the chemical‐catalytic synthesis of various derivatives of LA by focusing on its functionalities and reactivity patterns. Recent literature on some crucial derivatives such as γ‐valerolactone, 4,4’‐diphenolic acid, and ethyl levulinate have been tabulated and discussed. The synthetic interconversion between various derivatives, mechanistic insights, critical analysis of the reaction parameters toward selective preparation of various derivatives, and their potential commercial applications have been elaborated using predominantly heterogeneous catalysts. A critical assessment of the relative advantages and shortcomings of the existing synthetic strategies for various derivatives of LA has been presented to enkindle fresh ideas.

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Efficient magnetic recoverable acid-functionalized-carbon catalysts for starch valorization to multiple bio-chemicals

Cited by 18 publications

References 53 publications

Green catalytic synthesis of phenprocoumon

Green catalytic synthesis of phenprocoumon

Nb-Based Zeolites: Efficient bi-Functional Catalysts for the One-Pot Synthesis of Succinic Acid from Glucose

Recent Advances in the Value Addition of Biomass‐Derived Levulinic Acid: A Review Focusing on its Chemical Reactivity Patterns

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