Characterization and catalytic performances of copper and cobalt-exchanged hydroxyapatite in glycerol conversion for 1-hydroxyacetone production

Carvalho, Davi C.; Pinheiro, Ludimila Gomes; Campos, Adriana; Millet, Edwin R.C.; Sousa, Francisco F. de; Filho, J. Mendes; Saraiva, G.D.; Filho, Edson Cavalcanti da Silva; Fonseca, Maria G.; Oliveira, Alcinéia C.

doi:10.1016/j.apcata.2013.11.014

Cited by 43 publications

(27 citation statements)

References 40 publications

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“…Most selectivity to lactic acid results show the same features concerning the byproducts formed at such mild conditions but they are usually assigned to the oxidation only and these values do not overpass 40% [2]. In the literature scarce mention has been made about the possibility of having light products such as methanol and gases [2,12,18].…”

Section: Effect Of the Reaction Time And Temperaturementioning

confidence: 88%

“…At higher temperatures, conversion of glycerol is around 60%. The findings state that the first step of the reaction is the glycerol oxidation to glyceraldehyde (or dihydroxyacetone), being the rate limiting step, and thereby at low reaction times there is a difficulty to remove the OH groups of glycerol at mild conditions, according to mechanistic considerations [12,18].…”

Section: Effect Of the Reaction Time And Temperaturementioning

confidence: 98%

“…10a). Studies on synthesis of lactic acid by alkaline hydrothermal conversion of glycerol with a NaOH to glycerol molar ratio of 1 [12,41] reported that low concentrations of alkali-bases such as NaOH are more effective than metal hydroxides (KOH, LiOH, Ba(OH) 2 , Sr(OH) 2 , Ca(OH) 2 Mg(OH) 2 ) for obtaining high yields due to their relative solubility in water.…”

Section: Influence Of the Naoh/glycerol Molar Ratiomentioning

confidence: 99%

“…Among them, selective oxidation of glycerol to lactic acid at aqueous alkaline conditions at relatively low temperatures is feasible to resolve the timeconsuming of the process. Indeed, because of massive biodiesel production, the catalytic conversion of raw glycerol to green bulk chemicals is an alternative route to transform the surplus of the tri-alcohol [3,[9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of lactic acid from glycerol using a Pd/C catalyst

Marques

Oliveira

Filho

et al. 2015

Fuel Processing Technology

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Section: Effect Of the Reaction Time And Temperaturementioning

confidence: 88%

Section: Effect Of the Reaction Time And Temperaturementioning

confidence: 98%

Section: Influence Of the Naoh/glycerol Molar Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of lactic acid from glycerol using a Pd/C catalyst

Marques

Oliveira

Filho

et al. 2015

Fuel Processing Technology

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“…Hydroxyacetone stands out as a key chemical for producing lactic acid since it is not only obtained from glycerol [24,26] but also from a wide variety of biomass-derived compounds [27,28]. Nevertheless, it has surprisingly been neglected and specific systematic studies on hydroxyacetone transformation to lactic acid are rarely found.…”

Section: Introductionmentioning

confidence: 99%

Lactic acid production from aqueous-phase selective oxidation of hydroxyacetone

Albuquerque

Borges

Fraga

2015

Journal of Molecular Catalysis A: Chemical

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Structure and Surface Study of Hydroxyapatite‐Based Materials

Costentin

Drouet

Salles

et al. 2022

Design and Applications of Hydroxyapatite‐Based Catalysts

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In addition to designing catalytic materials ever more active and selective, the emergence of new classes of greener catalysts remains very challenging. The apatite family system with hydroxyapatite (HA) structure appears as a good candidate for catalysis due to its ecocompatibility properties, its sorption ability toward organic molecules, and its tunable composition resulting into modulation of its surface properties. Depending on their mode of preparation, these inexpensive and environment-friendly apatitic calcium phosphates exhibit properties of relevance to catalysis, such as large surface area and various morphologies.However, most studies focused so far on the catalytic performance of these compounds, while the study of structure-reactivity relationships required for rationalized optimization remains rather limited. This chapter aims at providing tools to help understand the catalytic behavior of apatite compounds, giving details about their structure, surface properties, and reactivity; this will include both stoichiometric and nonstoichiometric compounds, sometimes biomimetic and potentially substituted. A special attention is dedicated to recent advances in the characterization of their structural properties (bulk and surface/interphase) that have a strong impact on their reactivity, through both experimental and computational approaches to study the mechanisms occurring in the structure or at the crystals surface, as well as thermodynamic and dynamical properties. Remaining characterization challenges for apatite-based catalysts will also be discussed. 1.an influence on the charges carried by the cation and on the related strength of the Ca-O interaction [127], which results in different adsorption properties with guest molecules. To go further, quantum calculations coupled with NMR (Nuclear Magnetic Resonance) resultsshowed the impact of the presence of OHions on the migration of Ca 2+ as well as the rotation of PO4 3groups [128]. In the hydroxyapatite structure, phosphate ions PO4 3are the largest components of the structure. As such, they provide a primary backbone via 3D compact-like piling, generating interstitial sites for the other ions of the structure. Metal cations such as Ca 2+ occupy two types of crystallographic sites, denoted Ca1 (4 sites per unit formula) and Ca2 (6 sites per unit formula), see Figure 2. Ca1 sites are localized along the trigonal axis with the coordinates (1/4, 3/4, 1/2) and (3/4, 1/4, 1/2), forming linear columns along the c-axis. Ca2 sites in contrast form equilateral triangles at z = 1/4 and z = 3/4 on the sixfold screw (senary) 63 axes. Adjacent Ca1 and Ca2 sites are linked through shared oxygen atoms from PO4 tetrahedra. Ca1 sites generate (distorted) polyhedra where the metal ion is in ninefold coordination, while in Ca2 sites it is in sevenfold coordination.The Ca2 triangles contribute to delimit so-called "apatitic channels" where ions such as OHare axially located (Figure 3) [116,120]. In calcium hydroxyapatite, the Ca2 triangular sites correspond to the narrow...

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Characterization and catalytic performances of copper and cobalt-exchanged hydroxyapatite in glycerol conversion for 1-hydroxyacetone production

Cited by 43 publications

References 40 publications

Synthesis of lactic acid from glycerol using a Pd/C catalyst

Synthesis of lactic acid from glycerol using a Pd/C catalyst

Lactic acid production from aqueous-phase selective oxidation of hydroxyacetone

Structure and Surface Study of Hydroxyapatite‐Based Materials

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