Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

Dixit, Manish; Mishra, Manish; Joshi, Pradyuman A.; Shah, Dinesh O.

doi:10.1016/j.jiec.2012.08.028

Cited by 52 publications

(44 citation statements)

References 62 publications

(87 reference statements)

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“…5 show broad absorption band at 3420 cm 1 of O-H stretching absorption of interlayer water molecules and hydroxyl groups in the layered structure 11 and the bands at 3000 cm 1 and 1640 cm 1 represent the interlayer water 15 . The sharp peak at 1359 cm 1 with a shoulder at 1559 cm 1 corresponded to symmetric and asymmetric stretching absorption of C-O and C O in interlayered carbonate ion 11,16 . The broad peaks in the range of 400-1000 cm 1 correspond to stretching absorption of Mg-OH or Al-OH 13,17 .…”

Section: Catalyst Characterizationmentioning

confidence: 98%

Effect of Calcination Temperature on Mg-Al Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde

2019

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Section: Catalyst Characterizationmentioning

confidence: 98%

Effect of Calcination Temperature on Mg-Al Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde

2019

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“…The XRD patterns of the Mg‐Al supported catalysts are given in Figure , with the pattern of the uncalcined commercial Mg‐Al hydrotalcite for reference. In Figure A, the pattern of Com.Hydrotalcite showed the double‐layered crystal structure of hydrotalcite with the presence of characteristic diffraction peaks in the 2θ range of 20–30° and other asymmetric peaks in the 2θ range of 30–50° . However, the XRD pattern of the 5Ni‐3Co/Com.Hydrotalcite catalyst showed that structure change occurred during calcination as the characteristic peaks of hydrotalcite was not observed.…”

Section: Resultsmentioning

confidence: 98%

Hydrogen generation via supercritical water gasification of lignin using Ni-Co/Mg-Al catalysts

Kang

Azargohar

Dalai

et al. 2017

Int. J. Energy Res.

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Summary In this study, a group of Ni‐Co/Mg‐Al catalysts was prepared for hydrogen production via supercritical water gasification of lignin. The effects of different supports and preparation methods were examined. All catalysts were evaluated under the operation conditions of 650 °C, 26 MPa, and water to biomass mass ratio of 5 in a batch reactor. The Cop.2.6Ni‐5.2Co/2.6Mg‐Al catalyst showed the best performance with highest gas yield (12.9 wt%) and hydrogen yield (2.36 mmol·g−1). The results from catalyst characterization suggest that the properties of this type of catalyst are dependent on multiple factors including support Mg‐Al molar ratio and preparation method, and better coke resistance of the catalyst could be obtained by the preparation method of coprecipitation. Therefore, coprecipitation method should be applied for the preparation of Ni‐Co/Mg‐Al catalysts for hydrogen production via supercritical water gasification of lignin. Copyright © 2017 John Wiley & Sons, Ltd.

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“…The acidic and basic properties were determined by NH3-TPD and CO2-TPD, respectively, as shown in Figure 5. The acidic sites can be classified as weak (150-250 o C), medium (250-350 o C) and strong (350-450 o C) on the basis of the desorption temperature [20]. It can be assumed that the NH3 desorption in the low-temperature (LT) range is attributed to the presence of physisorbed NH3 species and/or ammonia adsorbed on very weak Brønsted acid sites, whereas the high-temperature (HT) maximum corresponds to ammonia leaving stronger Lewis sites [21].…”

Section: Bulletin Of Chemical Reaction Engineering and Catalysis 11 (3mentioning

confidence: 99%

Liquid-phase Hydrogenation of Phenol to Cyclohexanone over Supported Palladium Catalysts

Fan

Shen

Liu

et al. 2016

Bull. Chem. React. Eng. Catal.

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The ZSM-5, -Al2O3, SiO2 and MgO supported Pd-catalysts were prepared for the phenol hydrogenation to cyclohexanone in liquid-phase. The natures of these catalysts were characterized by XRD, N2 adsorption-desorption analysis, H2-TPR, CO2-TPD and NH3-TPD. The catalytic performance of the supported Pd-catalyst for phenol hydrogenation to cyclohexanone is closely related to nature of the support and the size of Pd nanoparticles. The Pd/MgO catalyst which possesses higher basicity shows higher cyclohexanone selectivity, but lower phenol conversion owing to the lower specific surface area. The Pd/SiO2 catalyst prepared by precipitation gives higher cyclohexanone selectivity and phenol conversion, due to the moderate amount of Lewis acidic sites, and the smaller size and higher dispersion of Pd nanoparticles on the surface. Under the reaction temperature of 135 o C and H2 pressure of 1 MPa, after reacting for 3.5 h, the phenol conversion of 71.62% and the cyclohexanone selectivity of 90.77% can be obtained over 0.5 wt% Pd/SiO2 catalyst.

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Physico-chemical and catalytic properties of Mg–Al hydrotalcite and Mg–Al mixed oxide supported copper catalysts

Cited by 52 publications

References 62 publications

Effect of Calcination Temperature on Mg-Al Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde

Effect of Calcination Temperature on Mg-Al Layered Double Hydroxides (LDH) as Promising Catalysts in Oxidative Dehydrogenation of Ethanol to Acetaldehyde

Hydrogen generation via supercritical water gasification of lignin using Ni-Co/Mg-Al catalysts

Liquid-phase Hydrogenation of Phenol to Cyclohexanone over Supported Palladium Catalysts

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