An Environmentally Friendly Nb–P–Si Solid Catalyst for Acid-Demanding Reactions

Aronne, Antonio; Serio, Martino Di; Vitiello, Rosa; Clayden, Nigel J.; Minieri, Luciana; Imparato, Claudio; Piccolo, Alessandro; Pernice, P.; Carniti, P.; Gervasini, Antonella

doi:10.1021/acs.jpcc.7b05886

Cited by 22 publications

(15 citation statements)

References 49 publications

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“…3 Catalysis greatly contributes to the development of new, greener, and potential chemical processes, offering feasible alternatives to stoichiometric reactions, thus acting as a driving force towards a more sustainable chemical industry. [24][25][26] Homogeneous and heterogeneous catalysts are both used in petrochemical industry as well as in biomass upgrading. Homogeneous catalysts, where the active sites are in the same phase as the reactants, can interact efficiently with the reaction substrates, typically resulting in higher turnover frequency (TOF) rates compared to heterogeneous catalysts.…”

Section: Introductionmentioning

confidence: 99%

Functionalised heterogeneous catalysts for sustainable biomass valorisation

et al. 2018

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Efficient transformation of biomass to value-added chemicals and high-energy density fuels is pivotal for a more sustainable economy and carbon-neutral society. In this framework, developing potential cascade chemical processes using functionalised heterogeneous catalysts is essential because of their versatile roles towards viable biomass valorisation. Advances in materials science and catalysis have provided several innovative strategies for the design of new appealing catalytic materials with well-defined structures and special characteristics. Promising catalytic materials that have paved the way for exciting scientific breakthroughs in biomass upgrading are carbon materials, metal-organic frameworks, solid phase ionic liquids, and magnetic iron oxides. These fascinating catalysts offer unique possibilities to accommodate adequate amounts of acid-base and redox functional species, hence enabling various biomass conversion reactions in a one-pot way. This review therefore aims to provide a comprehensive account of the most significant advances in the development of functionalised heterogeneous catalysts for efficient biomass upgrading. In addition, this review highlights important progress ensued in tailoring the immobilisation of desirable functional groups on particular sites of the above-listed materials, while critically discussing the role of consequent properties on cascade reactions as well as on other vital processes within the bio-refinery. Current challenges and future opportunities towards a rational design of novel functionalised heterogeneous catalysts for sustainable biomass valorisation are also emphasized.

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Section: Introductionmentioning

confidence: 99%

Functionalised heterogeneous catalysts for sustainable biomass valorisation

et al. 2018

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“…Indeed, the co-presence of HNO 3 results in the introduction of O-functionalities on the surface, acting as preferential anchoring sites for phosphate groups [31]. As known from the literature, P-containing materials are effective catalysts in the selective dehydration of fructose to 5-hydroxymethylfurfural (HMF) in water [34][35][36][37][38]. Indeed, grafting P groups on the surface allowed to tune the surface acidity and resulted in more selective catalysts compared to other solid acid catalysts [37].…”

Section: Introductionmentioning

confidence: 99%

Controlling the Incorporation of Phosphorus Functionalities on Carbon Nanofibers: Effects on the Catalytic Performance of Fructose Dehydration

Campisi

Trujillo

Motta

et al. 2018

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Phosphorylated carbons have been reported to be effective catalysts in dehydration reactions for biomass valorization. The amount and the nature of P groups are a key parameter affecting the catalytic performances of functionalized materials. Herein, we investigate the role of structural and surface properties of carbon-based materials, specifically carbon nanofibers, in determining the amount of P-functionalities. In order to incorporate P groups on carbon surfaces, various carbon nanofibers (CNFs) with different graphitization degrees have been functionalized through treatment with a H 3 PO 4 -HNO 3 mixture at 150 • C. The pristine materials, as well as the functionalization protocol, were properly selected to achieve an effective functionalization without drastically altering the morphology of the samples. Surface and structural properties of the synthesized functionalized materials have been investigated by means of transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The catalytic behavior of phosphorylated carbon nanofibers has been evaluated in the selective dehydration of fructose to hydroxymethylfurfural (HMF) to elucidate structure-activity relationships.

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“…The morphology of 2.5NbP-500 (Nb/P=1), characterized by the presence of both micropores and mesopores, has been already studied [3]; it is interesting to compare this sample with that obtained doubling the amount of Nb in the composition (5Nb2.5P-500 with Nb/P=2). The analysis of N2 adsorption/desorption isotherms (Fig.…”

Section: Morphological Characteristics and Acidity Determinationmentioning

confidence: 99%

“…Moreover, a large amount of OH groups was retained in the structure of these solids even after heating at temperatures higher than 500 °C. These materials, presenting peculiar acidic properties with high concentration of both Brønsted (BAS) and Lewis (LAS) acid sites, were tested in the hydrolysis of inulin as well as in the esterification of oleic acid with polyalcohols, showing good catalytic performances [3][4]. Particularly, the solid with molar A C C E P T E D M A N U S C R I P T composition 2.5Nb2O5•2.5P2O5•95SiO2 (2.5NbP) showed for both studied reactions higher activity and better stability in the reaction medium than well-known niobium oxophosphate, considered one of the best water-tolerant acid catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Nb/P ratio of acidic Nb P Si oxides on surface and catalytic properties

Gervasini

Campisi

Carniti

et al. 2019

Applied Catalysis A: General

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Highlights  A new Nb-P-Si gel derived catalyst with Nb/P=2 was prepared and its performances in the dehydration of fructose was tested and compared with those of Nb-P-Si gel derived catalyst with Nb/P=1.  The two Nb-P-Si gel derived catalysts maintained their effective acidity in both reaction environments, water and water-isopropanol solution, that directed the catalytic performances of activity and selectivity to hydroxymethylfurfural (HMF).  The catalysts durability and their selectivity to HMF were better in waterisopropanol solution than in water due to higher solubility of humins in the alcoholic solution.

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An Environmentally Friendly Nb–P–Si Solid Catalyst for Acid-Demanding Reactions

Cited by 22 publications

References 49 publications

Functionalised heterogeneous catalysts for sustainable biomass valorisation

Functionalised heterogeneous catalysts for sustainable biomass valorisation

Controlling the Incorporation of Phosphorus Functionalities on Carbon Nanofibers: Effects on the Catalytic Performance of Fructose Dehydration

Influence of the Nb/P ratio of acidic Nb P Si oxides on surface and catalytic properties

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