Continuous aqueous-phase cascade conversion of trioses to lactic acid over Nb2O5 catalysts

Santos, Kryslaine M. A.; Albuquerque, Elise M.; Coelho, Tiago L.; Fraga, Marco A.

doi:10.1007/s13399-021-02121-5

Cited by 3 publications

(3 citation statements)

References 72 publications

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“…Such sensitivity has indeed been observed in other reactions involved in biomass conversion processes. While Brønsted acid sites on Nb 2 O 5 (NbÀ OH) have been active in pentoses dehydration to furfural [26,52] and trioses conversion into lactic acid, [24,25,53] they have been shown inefficient in glucose upgrading to hydroxymethylfurfural. [26,52] Acid strength may also play a decisive role in this regard as phosphate Brønsted acid sites in NbOPO 4 (PÀ OH in HPO 4…”

Section: Chemcatchemmentioning

confidence: 99%

“…This present contribution focuses on furfuryl alcohol hydrolysis over Nb-based catalysts (Nb 2 O 5 and NbOPO 4 ) as they have been successfully used in acid-catalyzed reactions of biomass-derived molecules. [24][25][26][27] Furthermore, Nb-based materials are quite relevant in the Brazilian scenario as Brazil is the largest world producer being responsible for 88 % of global production. [28] Given the previously described background, this work aims at systematically investigating the role played by the nature of surface acid sites to disclose the activity of each sort of acid sites (Lewis and Brønsted), and the impact of their strength and amount on the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…This present contribution focuses on furfuryl alcohol hydrolysis over Nb‐based catalysts (Nb 2 O 5 and NbOPO 4 ) as they have been successfully used in acid‐catalyzed reactions of biomass‐derived molecules [24–27] . Furthermore, Nb‐based materials are quite relevant in the Brazilian scenario as Brazil is the largest world producer being responsible for 88 % of global production [28] .…”

Section: Introductionmentioning

confidence: 99%

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Hydrolysis of Furfuryl Alcohol to Angelica Lactones and Levulinic Acid over Nb‐based Catalysts

et al. 2023

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Levulinic acid and angelica lactones are important building blocks obtained from hemicellulose. This process comprises multiple chemical reactions at which furfuryl alcohol is an intermediate, but only few studies have investigated its hydrolysis. This work studied the role played by the nature of acid sites and the impact of their strength and amount on furfuryl alcohol hydrolysis over Nb2O5 and NbOPO4. It was disclosed that production of levulinic acid is a two‐step cascade reaction at which angelica lactones are intermediates. These two hydrolysis steps were catalyzed by Brønsted acid sites with no contribution from Lewis centers. Brønsted acidity of Nb2O5 presented no activity while phosphate moieties on NbOPO4 were effective. Mixtures of organic solvent and water hindered side reactions, improving selectivity to valued bioproducts. 1,4‐dioxane was the most suitable organic solvent. This study shows that selectivity of 96 % of levulinic acid and angelica lactones can be accomplished over NbOPO4.

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Section: Chemcatchemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrolysis of Furfuryl Alcohol to Angelica Lactones and Levulinic Acid over Nb‐based Catalysts

et al. 2023

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Valorization of sugarcane hemicellulose hydrolysate to green chemicals over BEA zeolites

Albuquerque,

Coelho,

Fraga

2024

Catalysis Communications

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Photocatalytic degradation of azithromycin formulation in aqueous solution by doped titanium dioxide/fiberglass-rubberized silicone photocatalytic membrane

Lupu,

Orbeci,

Bobirică

et al. 2023

Sustain Environ Res

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The objective of this work was to develop a novel photocatalytic membrane for the photocatalytic degradation of azithromycin formulation from aqueous solutions which, in addition to a high photocatalytic activity, should have a good mechanical and physico-chemical stability over time. Thus, the Nb-TiO2 and Nb-Fe-TiO2 photocatalysts were prepared by the solution combustion synthesis method, and then they were manually embedded in a fiberglass – rubberized silicone support. The mineralogical, morphological, and structural characterization of the obtained materials showed that both niobium and iron replace titanium in the titanium dioxide network, thus confirming the synthesis of new photocatalysts. The results of the photocatalytic oxidation tests showed a good photocatalytic activity of the developed photocatalytic membranes (degradation efficiency of up to 70% in the first 15 min of irradiation), this being on the one hand attributed to the increase of the specific surface of the photocatalyst by introducing niobium into the photocatalyst structure, and on the other hand due to the triggering of the Fenton photo oxidation mechanism due to the presence of trivalent iron in the photocatalyst structure. Also, the results indicated an excellent mechanical and physico-chemical resistance of the photocatalytic membranes, they are being practically inert to the harsh conditions in the photocatalytic reactor.

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Continuous aqueous-phase cascade conversion of trioses to lactic acid over Nb2O5 catalysts

Cited by 3 publications

References 72 publications

Hydrolysis of Furfuryl Alcohol to Angelica Lactones and Levulinic Acid over Nb‐based Catalysts

Hydrolysis of Furfuryl Alcohol to Angelica Lactones and Levulinic Acid over Nb‐based Catalysts

Valorization of sugarcane hemicellulose hydrolysate to green chemicals over BEA zeolites

Photocatalytic degradation of azithromycin formulation in aqueous solution by doped titanium dioxide/fiberglass-rubberized silicone photocatalytic membrane

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