Solid-solid interactions in the system with and without LiO2 doping

El-Shobaky, G.A.; Fagal, G.A.; El-Aal, A.Abd; Ghozza, A.M.

doi:10.1016/0040-6031(94)02101-s

Cited by 35 publications

(37 citation statements)

References 11 publications

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“…(1) When alone, MoO, sublimes upon heating in air at a temperature above its melting point (795OC) (EI-Shobaky and Ibrahim 1989;El-Shobaky et al 1996). Alumina can dissolve 41.4 wt% Mo0 3 to form an Mo0 3oAIP3 solid solution upon heating MoOjAIP3 mixed oxide samples at 1000°C (EI-Shobaky and Ibrahim 1989).…”

Section: Resultsmentioning

confidence: 99%

“…Pure and doped cobalt oxide solids were prepared by the thermal decomposition of pure basic cobalt carbonate (El-Shobaky et al 1980, 1982a and of basic cobalt carbonate treated with different proportions of aluminium nitrate and ammonium molybdate. The doped samples were obtained by treating a known weight of finely powdered basic cobalt carbonate with calculated amounts of AI(NO~)~.9Hp or (NH 4)fiMoP24"4Hp dissolved in the least amount of distilled water to make a paste.…”

Section: Experimental Materialsmentioning

confidence: 99%

“…1963;Roy 1968;Mucka and Cabicar 1975;Mucka and Tabacik 1991;El-Shobaky et al 1998;Hasan et al 1999) and homogeneous (Arinkar et al 1988;Uehara et al 1988) catalysts. The reaction proceeds via two pathways: (i) electron transfer between the reacting HP2 molecules and the catalytic substrate resulting in the formation of Hand H0 2 radicals and (ii) a chain reaction between the radicals produced to yield the final products [Hp(I) and 02(g)].…”

Section: Introductionmentioning

confidence: 99%

“…activity of tested solid catalysts. These solids include metal oxide composites (Goldenstein and Tseung 1974) and oxides of mixed valency cations (Zaki et al 1986;EI-Shobaky et al 1998).…”

Section: Introductionmentioning

confidence: 99%

“…1985c. Cop4 is a p-type semiconductor (Vagner and Kock 1936;Kostad 1972) which acts as an active solid in oxidation-reduction reactions, the oxidation of CO by 02 (EI-Shobaky et al 1982a) and in the decomposition of HP2 (EI-Shobaky et al 1998;Fagal et al 1998). Doping of COP4 with Lip effected significant changes in its catalytic activity in both reactions (EI-Shobaky 1982a.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Al₂O₃ and MoO₃ Doping of Co₃O₄ Solid on its Surface and Catalytic Properties

El-Shobaky

Turky

1999

Adsorption Science & Technology

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Pure and doped COP4 samples were prepared by thermal decomposition at 500-IOOO"C of pure basic cobalt carbonate and of the basic carbonate treated with aluminium nitrate and ammonium molybdate. The amounts of dopants added were varied within the range 0.75-6 mol% Alp, and 0.025-6 mol% MoO,. The influence of this treatment on the specific surface areas and catalytic activities of the COP4 solids was investigated using nitrogen adsorption at -196"C and studies of the decomposition of HPz at 3D-50"C.The results obtained revealed that doping of cobaltic oxide solids with either Alp) or MoO), followed by calcination at 500"C and 700"C, resulted in a progressive increase in the BET surface areas. This increase was, however, more pronounced in the case of MoO) doping. Calcination of the doped solids at 900"C led to an increase in the BET surface areas of the Alp,-treated solids and to a small decrease in the specific surface areas of the MoO,-doped samples.Calcination of the variously doped solids at 500-900"C brought about a decrease in their catalytic activity to an extent proportional to the amount of dopant added. Thus, treatment of COP4 solids with 6 mol% Alp, followed by calcination at 500"C, 700°C and 900°C effected a decrease of 36.9, 42.8 and 67.5% in their activities (expressed as reaction rate constant per unit area) measured at 300c. The decrease in the catalytic activity of COP4 solids due to MoO, doping was greater than that effected by Alp, doping. The doping process did not change the mechanism of the catalytic reaction but effectively decreased the concentration of CO)<--C0 2< ion pairs acting as the active sites involved in the catalytic process.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…activity of tested solid catalysts. These solids include metal oxide composites (Goldenstein and Tseung 1974) and oxides of mixed valency cations (Zaki et al 1986;EI-Shobaky et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Al₂O₃ and MoO₃ Doping of Co₃O₄ Solid on its Surface and Catalytic Properties

El-Shobaky

Turky

1999

Adsorption Science & Technology

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Sol–gel synthesis of NiFe2O4 with PVA matrices and their catalytic activities for one-step hydroxylation of benzene into phenol

Othman

2013

J Therm Anal Calorim

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Effect of Li2O and CoO-doping of CuO/Fe2O3 system on its surface and catalytic properties

El-Shobaky

Mokhtar

2007

Applied Surface Science

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Solid-solid interactions in the system with and without LiO2 doping

Cited by 35 publications

References 11 publications

Effect of Al₂O₃ and MoO₃ Doping of Co₃O₄ Solid on its Surface and Catalytic Properties

Effect of Al₂O₃ and MoO₃ Doping of Co₃O₄ Solid on its Surface and Catalytic Properties

Sol–gel synthesis of NiFe2O4 with PVA matrices and their catalytic activities for one-step hydroxylation of benzene into phenol

Effect of Li2O and CoO-doping of CuO/Fe2O3 system on its surface and catalytic properties

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Solid-solid interactions in the system with and without LiO2 doping

Cited by 35 publications

References 11 publications

Effect of Al2O3 and MoO3 Doping of Co3O4 Solid on its Surface and Catalytic Properties

Effect of Al2O3 and MoO3 Doping of Co3O4 Solid on its Surface and Catalytic Properties

Sol–gel synthesis of NiFe2O4 with PVA matrices and their catalytic activities for one-step hydroxylation of benzene into phenol

Effect of Li2O and CoO-doping of CuO/Fe2O3 system on its surface and catalytic properties

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Effect of Al₂O₃ and MoO₃ Doping of Co₃O₄ Solid on its Surface and Catalytic Properties

Effect of Al₂O₃ and MoO₃ Doping of Co₃O₄ Solid on its Surface and Catalytic Properties