Surface and catalytic properties of Cr2O3/MgO system doped with manganese and cobalt oxides

El-Molla, Sahar A.

doi:10.1016/j.apcata.2004.10.042

Cited by 22 publications

(19 citation statements)

References 23 publications

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“…reactions [5]. Catalytic decomposition of H 2 O 2 is an oxidationreduction reaction, one of its applications as a green fuel/ propellant instead of carcinogenic hydrazine in spaceflight at certain conditions [25].…”

Section: Introductionmentioning

confidence: 99%

“…The oxidative removal of natural organic matter from waters takes place by using hydrogen peroxide [27]. Decomposition of H 2 O 2 over metal oxides and their mixtures is considered as a laboratory test reaction for the redox activity of both heterogeneous [5] and homogeneous catalysis [28]. The catalytic behavior of metal oxides may be described in the reaction involved oxidation-reduction process [25].…”

Section: Introductionmentioning

confidence: 99%

“…Magnesium oxide with high surface area and nanocrystalline structure has promising applications as a catalyst and catalyst support for some reactions such as dry reforming [15] and oxidative dehydrogenation of butane [16]. Doping of metal oxide system with certain foreign oxides brought about significant modifications in their electrical, optical, magnetic, surface and catalytic properties [5,17]. The acid-base properties of MgO induced by promotion with foreign cations depend on both the amount and the kind of the cation added [18].…”

Section: Introductionmentioning

confidence: 99%

“…Several parameters may affect the physicochemical, surface and catalytic properties of various catalytic systems toward certain catalytic reaction [1] such as preparation conditions [2], thermal treatment [3], choice of the support material [4] and doping with certain foreign oxides [5]. Supported transition metal oxides are interesting catalysts due to their surface acid-base character [6] and oxidation-reduction properties [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of ZrO2-doping of nanosized Fe2O3/MgO system on its structural, surface and catalytic properties

Hassan

El-Molla

Mohamed

et al. 2012

Materials Research Bulletin

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of ZrO2-doping of nanosized Fe2O3/MgO system on its structural, surface and catalytic properties

Hassan

El-Molla

Mohamed

et al. 2012

Materials Research Bulletin

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“…The experimental energy band gap value for Cr 2 O 3 is ∼3.4 eV. [6][7][8][9] However, pristine Cr 2 O 3 was reported with poor gas sensitivity. The gas sensing properties of the materials can be enhanced with surface activation or substitution of impurities into pristine Cr 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

A first-principles study of chlorine adsorption characteristics on α-Cr2O3 nanostructures

Nagarajan

Chandiramouli

2015

J Chem Sci

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The structural stability, electronic and adsorption properties of chlorine on pristine, Zn, W and Nsubstituted α-Cr 2 O 3 nanostructures are successfully optimized and simulated with the help of density functional theory utilizing B3LYP/ LanL2DZ basis set. The structural stability of α-Cr 2 O 3 nanostructures are discussed in terms of formation energy. The electronic properties of pristine, Zn, W and N-substituted α-Cr 2 O 3 nanostructures are described with HOMO-LUMO gap, ionization potential and electron affinity. Dipole moment and point symmetry group of pristine, Zn, W and N-substituted α-Cr 2 O 3 nanostructures are reported. The adsorption characteristics of Cl 2 on α-Cr 2 O 3 materials are investigated and the prominent adsorption sites of Cl 2 on α-Cr 2 O 3 nanostructures are identified. The important parameters such as adsorbed energy, energy gap, average energy gap variation and Mulliken population analysis are used to find the favourable adsorption site of Cl 2 on α-Cr 2 O 3 base material. The substitution of impurities such as Zn, W and N in α-Cr 2 O 3 nanostructures enhances the Cl 2 adsorption characteristics in the mixed gas environment.

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Preparation and characterization of polypyrrole with dispersed metallic rhodium particles

Stochmal

Hasik

Turek

et al. 2011

Polymers for Advanced Techs

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Polypyrrole (PPy) with dispersed metallic Rh particles has been prepared by all‐chemical route, i.e. reduction of Rh3+ ions existing in RhCl3 aqueous solutions with sodium borohydride (NaBH4) carried out in the presence of the previously obtained PPy doped with chloride ions (PPyCl). PPy–Rh composites thus formed have been characterized using X‐ray diffraction (XRD), scanning and transmission electron microscopies (SEM, TEM) combined with energy dispersive X‐ray (EDX) microanalysis, Rh3d X‐ray photoelectron (XPS), and IR spectroscopies. This has made it possible to find out that metallic Rh nanoparticles, mainly of sizes below 10 nm, have been present in the composites. Agglomerates, with sizes up to 0.7 µm, have been formed in the systems containing higher amounts of Rh. PPy serving as the matrix in the composites has been doped. However, its doping level has been lower than that of the starting PPyCl. This has been explained by partial reduction of the polymer occurring during preparation of the composites. Catalytic properties of the PPy–Rh systems have been investigated using isopropyl alcohol conversion as a test reaction. It has been established that the composites are active redox catalysts. This makes them promising materials for applications as catalysts of various redox processes. Copyright © 2010 John Wiley & Sons, Ltd.

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Surface and catalytic properties of Cr2O3/MgO system doped with manganese and cobalt oxides

Cited by 22 publications

References 23 publications

Effect of ZrO2-doping of nanosized Fe2O3/MgO system on its structural, surface and catalytic properties

Effect of ZrO2-doping of nanosized Fe2O3/MgO system on its structural, surface and catalytic properties

A first-principles study of chlorine adsorption characteristics on α-Cr2O3 nanostructures

Preparation and characterization of polypyrrole with dispersed metallic rhodium particles

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