Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

Stamate, Alexandra-Elisabeta; Pavel, Octavian Dumitru; Zăvoianu, Rodica; Marcu, Ioan–Cezar

doi:10.3390/catal10010057

Cited by 43 publications

(30 citation statements)

References 120 publications

(287 reference statements)

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“…En consecuencia, los LDH ofrecen una oportunidad notable para sintetizar nuevos materiales a través de la intercalación de compuestos entre sus capas, mejorando así sus propiedades químicas por efectos sinérgicos. Los LDH, se han empleado en varios procesos tecnológicos (Stamate et al, 2020) que van desde la producción de energía renovable hasta la purificación y remediación de agua, materiales funcionalizados para nanogeneradores piezoeléctricos y detección de gases, aplicaciones biomédicas, síntesis de nanocompuestos inteligentes híbridos, que involucran tecnologías en expansión como la liberación de medicamentos y el envasado de alimentos. La composición variable y propiedades intrínsecas de los LDH son las principales razones por las cuales su uso catalítico es su principal campo de aplicación, donde exhiben actividades y selectividades importantes en una amplia gama de reac-ciones que se llevan a cabo comúnmente en la industria, que incluyen condensación, alquilación, ciclación, isomerización, etc.…”

Section: Figura 1 Esquema Estructural De Los Materiales Tipo Hidrotal...unclassified

ELUCIDACIÓN DE LA FÓRMULA ESTEQUIOMÉTRICA DE NANOHIDROTALCITAS DE Mg Y Ni SINTETIZADAS POR EL MÉTODO DE COPRECIPITACIÓN

Rodrı́guez

Fernández

Domínguez³

et al. 2021

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Los hidróxidos dobles laminares (LDH, por sus siglas en inglés), también denominados como Hidrotalcitas (HTs), son una clase de materiales arcillosos bidimensionales conocidos por su estructura laminar única, composición versátil y propiedades de intercambio iónico. En este trabajo se reporta la determinación de la relación estequiométrica de arcillas tipo HTs sintetizadas en el laboratorio por el método de co-precipitación. El contenido de metales di y tri-valente que conforman las estructuras de las arcillas fue cuantificado por espectroscopia de absorción atómica por llama. Se sintetizaron dos tipos de HTs, Ni (HT-Ni) y Mg (HT-Mg); donde de acuerdo con los cálculos realizados la formula estequiométrica para la primera arcilla es Ni0,82Al0,18(OH)2(NO3)0,18 y Mg0,80Al0,20(OH)2(NO3)0,20 para la segunda, resultados que concuerdan perfectamente con la literatura. Las arcillas sintetizadas fueron caracterizadas por difracción de rayos X, espectroscopia FT-IR y microscopia electrónica de barrido. Los patrones de difracción de rayos X confirmaron la formación de HTs de tamaño de partícula nanométrico, donde la HT-Mg sintetizada posee mejores propiedades cristalinas.

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Section: Figura 1 Esquema Estructural De Los Materiales Tipo Hidrotal...unclassified

ELUCIDACIÓN DE LA FÓRMULA ESTEQUIOMÉTRICA DE NANOHIDROTALCITAS DE Mg Y Ni SINTETIZADAS POR EL MÉTODO DE COPRECIPITACIÓN

Rodrı́guez

Fernández

Domínguez³

et al. 2021

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“…Among mixed oxides, perovskites or pyrochlore-type oxides [74][75][76][77][78][79], as well as transition metal-containing mixed oxides obtained from layered double hydroxides (LDH) precursors [80][81][82][83][84][85], proved to have high activity and good stability in methane combustion. It has been observed that the promotion of lanthanum oxide and Co 3 O 4 or Co 3 O 4 -ZrO 2 by cerium increases the activity of these catalysts [86,87].…”

Section: Introductionmentioning

confidence: 99%

Total Oxidation of Methane on Oxide and Mixed Oxide Ceria-Containing Catalysts

et al. 2021

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Methane, discovered in 1766 by Alessandro Volta, is an attractive energy source because of its high heat of combustion per mole of carbon dioxide. However, methane is the most abundant hydrocarbon in the atmosphere and is an important greenhouse gas, with a 21-fold greater relative radiative effectiveness than CO2 on a per-molecule basis. To avoid or limit the formation of pollutants that are dangerous for both human health and the atmospheric environment, the catalytic combustion of methane appears to be one of the most promising alternatives to thermal combustion. Total oxidation of methane, which is environmentally friendly at much lower temperatures, is believed to be an efficient and economically feasible way to eliminate pollutants. This work presents a literature review, a statu quo, on catalytic methane oxidation on transition metal oxide-modified ceria catalysts (MOx/CeO2). Methane was used for this study since it is of great interest as a model compound for understanding the mechanisms of oxidation and catalytic combustion on metal oxides. The objective was to evaluate the conceptual ideas of oxygen vacancy formation through doping to increase the catalytic activity for methane oxidation over CeO2. Oxygen vacancies were created through the formation of solid solutions, and their catalytic activities were compared to the catalytic activity of an undoped CeO2 sample. The reaction conditions, the type of catalysts, the morphology and crystallographic facets exposing the role of oxygen vacancies, the deactivation mechanism, the stability of the catalysts, the reaction mechanism and kinetic characteristics are summarized.

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“…Therefore, extensive researchers had paid great attention to develop an appropriate heterogeneous catalytic system for the oxidation of toluene. [8][9][10][11][12][13][14] Gu et. al.…”

Section: Introductionmentioning

confidence: 99%

Cu(II) and Co(II) Schiff‐Base Complexes Immobilized on Layered Double Hydroxide: Synthesis, Characterizations, DFT Calculations and Catalytic Activity

Kirar¹,

Khare

Tiwari

2021

ChemistrySelect

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In this study, we are reporting the synthesis, characterization, theoretical studies, and catalytic activity of Cu(II), and Co(II) Schiff base complexes immobilized on layered double hydroxide abbreviated as LDH‐[NAPABA‐M] {where M=Cu(II), and Co(II)}. The Schiff base ligand (E)‐4‐((2‐hydroxynaphthalen‐1‐yl)methyleneamino)benzoic acid have been synthesized from the condensation of 2‐hydroxy‐1‐naphthaldehyde and 4‐amino benzoic acid. The complexes were characterized using Inductively coupled plasma‐Atomic emission spectrometry (ICP‐ AES), X‐Ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X‐Ray (EDX), Fourier transform infrared (FTIR), Electron paramagnetic resonance (EPR) spectroscopy, Thermogravimetric analysis (TGA) etc. and the geometry of the ligand has been calculated using Density Functional Theory (DFT) calculations at the B3LYP/6‐31G level of theory. The catalytic activity of synthesized catalysts was tested for toluene oxidation with tert‐butyl hydroperoxide under solvent‐free conditions. The LDH‐[NAPABA‐Cu(II)] catalyst was recycled up to seven cycles. Hot filtration experiments demonstrate that the catalyst was heterogeneous in nature and stable.

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Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

Cited by 43 publications

References 120 publications

ELUCIDACIÓN DE LA FÓRMULA ESTEQUIOMÉTRICA DE NANOHIDROTALCITAS DE Mg Y Ni SINTETIZADAS POR EL MÉTODO DE COPRECIPITACIÓN

ELUCIDACIÓN DE LA FÓRMULA ESTEQUIOMÉTRICA DE NANOHIDROTALCITAS DE Mg Y Ni SINTETIZADAS POR EL MÉTODO DE COPRECIPITACIÓN

Total Oxidation of Methane on Oxide and Mixed Oxide Ceria-Containing Catalysts

Cu(II) and Co(II) Schiff‐Base Complexes Immobilized on Layered Double Hydroxide: Synthesis, Characterizations, DFT Calculations and Catalytic Activity

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