Acid–base properties of Mg–Ni–Al mixed oxides using LDH as precursors

Casenave, S.; Martínez, Hervé; Guímon, C.; Auroux, A.; Hulea, Vasile; Cordoneanu, Adina; Dumitriu, Emil

doi:10.1016/s0040-6031(01)00606-2

Cited by 77 publications

(55 citation statements)

References 12 publications

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“…This process is reversible and rehydration generates again Brőnsted basic sites in the LDH structure. [17][18][19] In this work aldol condensation of benzaldehyde and heptanal yielding jasmine aldehyde and 2-pentylnon-2-enal was studied as a model reaction to explore the catalytic properties of a number of catalysts consisting of prepared and industrial Al-Mg mixed oxides.…”

Section: Introductionmentioning

confidence: 99%

Aldol condensation of benzaldehyde and heptanal: a comparative study of laboratory and industrially prepared Mg–Al mixed oxides

Vrbková

Tišler

Vyskočilová

et al. 2017

J of Chemical Tech & Biotech

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Section: Introductionmentioning

confidence: 99%

Aldol condensation of benzaldehyde and heptanal: a comparative study of laboratory and industrially prepared Mg–Al mixed oxides

Vrbková

Tišler

Vyskočilová

et al. 2017

J of Chemical Tech & Biotech

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“…Layered double hydroxides (LDHs), also known as hydrotalcite-like materials, are an important class of layered materials and have the general formula [M Ⅱ 1-y M Ⅲ y (OH) 2 ] y+ (A n-) y/n ·mH 2 O, where M Ⅱ and M Ⅲ are di-and trivalent metal cations, respectively, A n-denotes an organic or inorganic anion with negative charge n, and y ( = [M Ⅲ ]/([M Ⅱ ] + [M Ⅲ ])) is the stoichiometric coefficient. LDHs have a wide range of applications in many fields, e.g., as catalysts or catalyst precursors, ion exchangers, adsorbents for environmental contaminants, and substrates for the immobilization of biological material [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…LDHs have a wide range of applications in many fields, e.g., as catalysts or catalyst precursors, ion exchangers, adsorbents for environmental contaminants, and substrates for the immobilization of biological material [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Thermal decomposition of the LDH at high temperature leads to the formation of mixed metal oxide (MMO) materials composed of spinel-like (M Ⅱ M Ⅲ 2 O 4 ) phases and other metal oxide phases (M Ⅱ O) and previous studies have shown that such materials can be used as catalysts and catalyst supports, sensors, and Li-ion battery electrodes [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Exchange-biased NiFe2O4/NiO nanocomposites derived from NiFe-layered double hydroxides as a single precursor

Zhao

Wang

et al. 2010

Nano Res.

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NiFe 2 O 4 nanoparticles (<10 nm) embedded in a NiO matrix have been fabricated by calcining the corresponding Ni Ⅱ Fe Ⅲ -layered double hydroxide (LDH) precursors at high temperature (500 °C ). Compared with the NiFe 2 O 4 /NiO nanocomposite obtained by calcination of a precursor prepared by a traditional chemical coprecipitation method, those derived from NiFe-LDH precursors show much higher blocking temperatures (T B ) (~380 K). The enhanced magnetic stability can be ascribed to the much stronger interfacial interaction between NiFe 2 O 4 and NiO phases due to the topotactic nature of the transformation of the LDH precursor to the NiFe 2 O 4 /NiO composite material. Through tuning the Ni Ⅱ /Fe Ⅲ molar ratio of the NiFe-LDH precursor, the NiFe 2 O 4 concentration can be precisely controlled, and the T B value as well as the magnetic properties of the final material can also be regulated. This work represents a successful example of the fabrication of ferro(ferri)magnetic (FM)/antiferrimagnetic (AFM) systems with high magnetic stability from LDH precursors. This method is general and may be readily extended to other FM/AFM systems due to the wide range of available LDH precursors.

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“…Although they are less diffuse in nature than cationic clays, they can be easily synthesized [1]. Hydrotalcites-type (HT) compounds have the general formula:…”

Section: Introductionmentioning

confidence: 99%

“…Besides giving information on dispersion of Rh, the study of interaction with CO allows to characterize the role of the support [7], which can strongly affect the catalytic activity [1]. Indeed, Rh in Rh/Mg/Al catalysts may be present in different phases.…”

Section: Introductionmentioning

confidence: 99%

In Situ IR Characterization of CO Interacting with Rh Nanoparticles Obtained by Calcination and Reduction of Hydrotalcite‐Type Precursors

Basile

Bersani

Gallo

et al. 2011

International Journal of Spectroscopy

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Supported Rh nanoparticles obtained by reduction in hydrogen of severely calcined Rh/Mg/Al hydrotalcite-type (HT) phases have been characterized by FT-IR spectroscopy of adsorbed CO [both at room temperature (r.t.) and nominal liquid nitrogen temperature] and Transmission Electron Microscopy (TEM). The effect of reducing temperature has been investigated, showing that Rh crystal size increases from 1.4 nm to 1.8 nm when the reduction temperature increases from 750• C to 950 • C. The crystal growth favours the formation of bridged CO species and linear monocarbonyl species with respect to gem-dicarbonyl species; when CO adsorbs at r.t., CO disproportionation occurs on Rh and it accompanies the formation of Rh I (CO) 2 . The role of interlayer anions in the HT precursors to affect the properties of the final materials has been also investigated considering samples prepared from silicate-instead of carbonate-containing precursors. In this case, formation of Rh I (CO) 2 and CO disproportionation do not occur, and this evidence is discussed in terms of support effect.

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Acid–base properties of Mg–Ni–Al mixed oxides using LDH as precursors

Cited by 77 publications

References 12 publications

Aldol condensation of benzaldehyde and heptanal: a comparative study of laboratory and industrially prepared Mg–Al mixed oxides

Aldol condensation of benzaldehyde and heptanal: a comparative study of laboratory and industrially prepared Mg–Al mixed oxides

Exchange-biased NiFe2O4/NiO nanocomposites derived from NiFe-layered double hydroxides as a single precursor

In Situ IR Characterization of CO Interacting with Rh Nanoparticles Obtained by Calcination and Reduction of Hydrotalcite‐Type Precursors

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