Grain boundary control in nanocrystalline MgO as a novel means for significantly enhancing surface basicity and catalytic activity

Vidruk, Roxana; Landau, Miron V.; Herskowitz, M.; Talianker, M.; Frage, N.; Ezersky, Vladimir; Froumin, N.

doi:10.1016/j.jcat.2009.02.014

Cited by 61 publications

(39 citation statements)

References 31 publications

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“…From the rates of the catalytic activity, calculated on the basis of normalized surface area, we found that the activity of the particles is higher for the reverse micellar route (5.6 Â 10 À3 mmol m À2 h À1 ) than the conventionally prepared sample (1.93 Â 10 À3 mmol m À2 h À1 ). The higher value suggests that the MgO nanoparticles obtained using the reverse micellar method is a better catalyst even with a low surface area and this is in accordance to the discussion by Landau et al in their study [23]. This could be attributed to the already known fact that the oxide nanoparticle inherits its morphology from the precursor and the occurrence of defects is largely dependent on its synthetic route [24].…”

Section: Catalytic Activitysupporting

confidence: 87%

Reverse micellar based synthesis of ultrafine MgO nanoparticles (8–10nm): Characterization and catalytic properties

Ganguly

Trinh

Ramanujachary

et al. 2011

Journal of Colloid and Interface Science

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Section: Catalytic Activitysupporting

confidence: 87%

Reverse micellar based synthesis of ultrafine MgO nanoparticles (8–10nm): Characterization and catalytic properties

Ganguly

Trinh

Ramanujachary

et al. 2011

Journal of Colloid and Interface Science

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“…In our previous article, 24 we considered that defects play an important role for the enhanced CO 2 capture on supported HTs. [29][30][31][32][33][34][35][36][37][38] The active sites for CO 2 adsorption on activated HTs (Mg(Al)O x ) are associated with O 2--Mg 2+ surface sites (MgO + CO 2 T MgCO 3 ). During sorption, the acidic CO 2 reacts with basic O 2-sites depending on their coordination.…”

Section: Resultsmentioning

confidence: 99%

On the Influence and Role of Alkali Metals on Supported and Unsupported Activated Hydrotalcites for CO₂ Sorption

Meis

Bitter

Jong

2010

Ind. Eng. Chem. Res.

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To increase the CO 2 capture capacity of hydrotalcites, the influence of alkali (K, Na) metal carbonate loading of activated supported and unsupported hydrotalcites (HT act ) on their CO 2 capture properties was investigated. The alkali-loaded supported hydrotalcites adsorb at 523 K, depending on the alkali metal (Na or K) and the preparation method, 1.7-2.2 mmol CO 2 g -1 HT which exceeds the capacity of unloaded supported HT (1.3 mmol CO 2 g -1 HT ) and K-loaded unsupported HT (∼0.3 mmol.g -1 ). The key for the increase in capacity in alkali-loaded HT is a close contact at least at a mesoscopic level between HT and alkali metal carbonate. The alkali metal carbonate could be successfully introduced either by impregnation of a K 2 CO 3 solution on assynthesized HT or by leaving residual K (or Na), from the synthesis, in the final material. The latter method is advocated since it omits a washing step after precipitation. The increase in capture capacity for alkali loaded HTs points to a higher concentration of defects (low-coordination oxygen sites) on the surface of the activated alkali loaded HTs compared to the unloaded HT. We propose that the higher concentration of adsorption sites is caused by the presence of Na + /K + on the surface of Mg(Al)O x .

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“…The results indicated that methyl ester yield exceeded 0.95 g/g oil at room temperature while almost no product was observed in the reaction based on macro-scale CaO. Nanocrystalline MgO [114,115] and Al 2 O 3 [116] were also investigated ( Table 4). Wang et al [117] prepared mesoporous nano KF/CaO-MgO catalyst by the co-participation method.…”

Section: Nanostructured Catalystsmentioning

confidence: 99%

Environmentally Sustainable Biofuels: Advances in Biodiesel Research

Vasudevan

2010

Waste Biomass Valor

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Due to diminishing petroleum reserves and the deleterious environmental consequences of exhaust gases from fossil-based fuels, research on renewable and environmentally friendly fuels has received a lot of impetus in recent years. With oil at high prices, alternate renewable energy has become very attractive. Many of these are eco-friendly. Besides ethanol, other unconventional choices are: biodiesel made from non-edible sources or waste cooking oil that can be blended with diesel; biobutanol; and gas-to-liquids from the abundance of natural gas, coal, or biomass. In this paper, we examine advances made in research on biodiesel. Current research on the synthesis of biodiesel can be classified into five areas: (i) the source of substrates, namely triglyceride and acyl-acceptors, (ii) reaction mechanism, (iii) catalysts for transesterification, including the application of inorganic base and acid catalysts as well as biocatalysts, (iv) solvent effects on biodiesel synthesis, especially in enzyme-catalyzed processes, and (v) operations and reactors involving traditional batch reactors, continuous reactors, novel membrane reactors and micro-channel reactors. Each of these areas is reviewed in this paper.

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Grain boundary control in nanocrystalline MgO as a novel means for significantly enhancing surface basicity and catalytic activity

Cited by 61 publications

References 31 publications

Reverse micellar based synthesis of ultrafine MgO nanoparticles (8–10nm): Characterization and catalytic properties

Reverse micellar based synthesis of ultrafine MgO nanoparticles (8–10nm): Characterization and catalytic properties

On the Influence and Role of Alkali Metals on Supported and Unsupported Activated Hydrotalcites for CO₂ Sorption

Environmentally Sustainable Biofuels: Advances in Biodiesel Research

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Grain boundary control in nanocrystalline MgO as a novel means for significantly enhancing surface basicity and catalytic activity

Cited by 61 publications

References 31 publications

Reverse micellar based synthesis of ultrafine MgO nanoparticles (8–10nm): Characterization and catalytic properties

Reverse micellar based synthesis of ultrafine MgO nanoparticles (8–10nm): Characterization and catalytic properties

On the Influence and Role of Alkali Metals on Supported and Unsupported Activated Hydrotalcites for CO2 Sorption

Environmentally Sustainable Biofuels: Advances in Biodiesel Research

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Product

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On the Influence and Role of Alkali Metals on Supported and Unsupported Activated Hydrotalcites for CO₂ Sorption