Microwave power effect on hydrotalcite synthesis

Rivera, José A.; Fetter, Geolar; Bosch, P.

doi:10.1016/j.micromeso.2005.10.041

Cited by 89 publications

(33 citation statements)

References 10 publications

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“…In addition, the weak band at 1645 cm −1 was due to H 2 O bending vibration in the interlayer space (Chen et al 2006). The sharp, intense (Rivera et al 2006). Heating the sample at 300 • C led to a slight modification of the spectrum ( figure 3, spectrum c).…”

Section: Fourier Transform-infrared (Ft-ir) Spectroscopymentioning

confidence: 98%

Study of structural transformations and phases formation upon calcination of Zn–Ni–Al hydrotalcite nanosheets

Song

Wang

et al. 2011

Bull Mater Sci

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In this paper, we describe a general process for the synthesis of highly crystalline Zn-Ni-Al hydrotalcitelike materials. The structure and thermal decomposition of the prepared samples are studied by XRD, FT-IR, TG-DSC, SEM, TEM and N 2 adsorption/desorption. The morphology of large-sized, porous and hexagonal platelike Zn-Ni-Al hydrotalcite is affected by calcination temperature. BET specific surface area and pore volume are observed to increase with increase of the calcination temperature up to 700 • C followed by a further decrease with increasing temperature.

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Section: Fourier Transform-infrared (Ft-ir) Spectroscopymentioning

confidence: 98%

Study of structural transformations and phases formation upon calcination of Zn–Ni–Al hydrotalcite nanosheets

Song

Wang

et al. 2011

Bull Mater Sci

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“…At higher intensity, a more homogeneous hydrotalcite structure was obtained than that at lower irradiation intensity. [101] Microwave irradiation has been applied for rapid synthesis of inorganic solids and organic synthetic reaction [41,75,76,96,101 -104] to reduce the long time period of aging and tedious washing. The use of microwave radiation as a source of heating not only reduces the aging time considerably but also enhances the kinetics of crystallization.…”

Section: Microwave Irradiationmentioning

confidence: 99%

Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review

Othman

Helwani

Martunus

et al. 2009

Applied Organom Chemis

195

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In this paper, widely accepted methods of hydrotalcite preparation such as co-precipitation, urea hydrolysis, hydrothermal, sol-gel, microwave irradiation, steam activation and solvothermal have been selected and reviewed. Our review indicates that the nature of the divalent cations, the synthesis method, the calcination temperature and the nature of the interlayer species are determinant factors in shaping the surface properties of the layered double hydoxides. The basic strength of the surface base site and structural changes produced in the mixed oxides can be adjusted conveniently by varying the Al content during the synthesis. The combination of sol-gel with microwave irradiation during the gelling and crystallization steps has also been found to increase the surface area of the hydrotalcite-like compound.

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“…Similar cavitation phenomena have allowed obtaining a better catalytic reactivity of solids in the Fischer-Tropsch reaction. Recently, microwaves radiation heating [27][28][29] and ultrasound [27,30,31] have been applied to the synthesis of hydrotalcites with different chemical compositions as an alternative to the conventional hydrothermal treatments. Several of the advantages listed above have been observed, especially the shorter treatment times needed to achieve enhanced crystallinity degrees, the higher specific surface area and the improved metallic dispersions [28,32,33].…”

Section: Introductionmentioning

confidence: 99%

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

et al. 2015

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Co6Al2HT hydrotalcite-like compounds were synthesized by three different methods: co-precipitation, microwaves-assisted and ultrasound-assisted methods. The mixed oxides obtained after calcination were studied by several techniques: XRD, TEM, H2-TPR and XPS. They were also tested as catalysts in the reaction of total oxidation of toluene. The physico-chemical studies revealed a modification of the structural characteristics (surface area, morphology) as well as of the reducibility of the formed mixed oxides. The solid prepared by microwaves-assisted synthesis was the most active. Furthermore, a relationship between the ratio of Co 2+ on the surface, the reducibility of the Co-Al mixed oxide and the T50 in toluene oxidation was demonstrated. This suggests a Mars Van Krevelen mechanism for toluene total oxidation on these catalysts.

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Microwave power effect on hydrotalcite synthesis

Cited by 89 publications

References 10 publications

Study of structural transformations and phases formation upon calcination of Zn–Ni–Al hydrotalcite nanosheets

Study of structural transformations and phases formation upon calcination of Zn–Ni–Al hydrotalcite nanosheets

Synthetic hydrotalcites from different routes and their application as catalysts and gas adsorbents: a review

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

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