Nanoscale metal oxide particles as chemical reagents. Intrinsic effects of particle size on hydroxyl content and on reactivity and acid/base properties of ultrafine magnesium oxide

Itoh, Hidenori; Utamapanya, Suchada; Stark, Jane V.; Klabunde, Kenneth J.; Schlup, John R.

doi:10.1021/cm00025a015

Cited by 126 publications

(96 citation statements)

References 1 publication

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“…[1] Some of them may also find use as catalysts, [2] conductive fillers, [3] and magnetic recording materials. [4] A broad range of metal oxides have been explored in this regard by various research groups, and notable examples include MgO, ZnO, CdO, Ga 2 O 3 , In 2 O 3 , TiO 2 , and SnO 2 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of MgO Nanowires Through a Vapor-Phase Precursor Method

Yin

Zhang

Xia³

2002

Adv. Funct. Mater.

176

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This paper describes a vapor‐phase, precursor method that generates MgO nanowires at relatively low temperatures (800–900 °C) as compared to previous approaches (≥ 1200 °C) that directly use MgO as the source material. Magnesium diboride (MgB2) powders were used as the precursor, which slowly decomposed into Mg and MgB4 under a constant flow of argon gas at temperatures as low as 700 °C. The Mg vapor subsequently reacted with trace O2 contained in the reaction system and formed MgO vapor. Under appropriate conditions, the MgO vapor could reach supersaturation, condense onto the surface of a solid substrate that was placed on top of the precursor powders, and grow into highly anisotropic nanostructures. Depending on the distance between the MgB2 source and the location on the solid substrate, a gradient in the MgO concentration existed. As a result, MgO nanostructures with different morphologies were formed on the solid support, including whiskers, tapered nanowires whose diameters were continuously reduced from ∼200 to 20–30 nm over a distance of ∼50 μm, and nanowires having uniform diameters (15–20 nm) and lengths up to ∼30 μm. When a mixture of dihydrogen and argon gases was used as the reaction atmosphere, MgO nanowires with a uniform cross‐section of ∼150 nm in diameter could grow several millimeters long without branching.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of MgO Nanowires Through a Vapor-Phase Precursor Method

Yin

Zhang

Xia³

2002

Adv. Funct. Mater.

176

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“…IR spectrum of the precursor obtained after exposure of magnesium methoxide to air showed residual OH peak in the MgO lattice, whose intensity decreased in subsequent calcination. Apparently, similar to the sol-gel derived magnesium oxide [25], during calcination, dehydroxylation takes place and causes anion vacancies to form, and finally, aggregation of magnesium ions around them produce locally accumulated positive charge [21]. Those locally accumulated positive charges act as acidic sites that are needed for adsorption of ketone.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Nanocrystalline Magnesium Oxide as a Versatile Heterogeneous Catalyst for the Meerwein–Ponndorf–Verley Reduction of Cyclohexanone into Cyclohexanol: Effect of Preparation Method of Magnesium Oxide on Yield

et al. 2009

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The Meerwein-Ponndorf-Verley (MPV) reaction of cyclohexanone with 2-propanol in the liquid phase in the presence of two different nanocrystalline magnesium oxides, prepared by different methods, was investigated. The catalyst consisting of nanocrystalline magnesium oxide, which was prepared by calcination of magnesium methoxide in air at 400°C, showed the highest activity in the conversion of cyclohexanone to cyclohexanol with 97% yield. The effect of calcination temperature of magnesium oxide on the cyclohexanol yield and reusability of the catalyst has been studied.

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“…[7] These surface atoms are not equivalent to each other and frequently play different roles in catalysis. In the following, we focus on metal nanoparticles, [8][9][10] as one can find good reviews about metal oxide [11][12][13][14][15][16] and semiconductor [17][18][19][20][21][22][23] nanoparticles elsewhere. One of the most attractive features of unsupported metal nanoparticles is the possibility to apply physicochemical methods to investigate them and to catalyze chemical reactions by exactly the same material.…”

Section: Introductionmentioning

confidence: 99%

Concepts for the Stabilization of Metal Nanoparticles in Ionic Liquids

Kraynov¹,

Müller²

2011

Applications of Ionic Liquids in Science and Technology

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Nanoscale metal oxide particles as chemical reagents. Intrinsic effects of particle size on hydroxyl content and on reactivity and acid/base properties of ultrafine magnesium oxide

Cited by 126 publications

References 1 publication

Synthesis and Characterization of MgO Nanowires Through a Vapor-Phase Precursor Method

Synthesis and Characterization of MgO Nanowires Through a Vapor-Phase Precursor Method

Nanocrystalline Magnesium Oxide as a Versatile Heterogeneous Catalyst for the Meerwein–Ponndorf–Verley Reduction of Cyclohexanone into Cyclohexanol: Effect of Preparation Method of Magnesium Oxide on Yield

Concepts for the Stabilization of Metal Nanoparticles in Ionic Liquids

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