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Open AccessArticle

Electrical Behavior of a Catalyst Composed of Laminar Manganese Oxide Supported on γ-Al2O3

by 1,2, 1,3,4,5,6 and 1,3,5,*
1
Grupo de Investigación en Procesos Químicos, Catalíticos y Biotecnológicos, Universidad Nacional de Colombia-Sede Manizales, Kilometro 9 vía al aeropuerto, La Nubia, 170003 Manizales, Colombia
2
Facultad de Ciencias e Ingeniería, Universidad de Boyacá, Carrera 2a Este No. 64–169, 15001 Tunja, Colombia
3
Laboratorio de Materiales Nanoestructurados y Funcionales, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Colombia-Sede Manizales, Kilometro 9 vía al aeropuerto, La Nubia, 170003 Manizales, Colombia
4
Departamento de Ingeniería Química, Facultad de Ingeniería y Arquitectura, Universidad Nacional de Colombia-Sede Manizales, Kilometro 9 vía al aeropuerto, La Nubia, 170003 Manizales, Colombia
5
Departamento de Física y Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Colombia-Sede Manizales, Kilometro 9 vía al aeropuerto, La Nubia, 170003 Manizales, Colombia
6
Departamento de Química, Universidad de Caldas, Calle 65 No. 26–10, 17001 Manizales, Colombia
*
Author to whom correspondence should be addressed.
Academic Editors: Bénédicte Lebeau and T. Jean Daou
Molecules 2019, 24(16), 2984; https://doi.org/10.3390/molecules24162984
Received: 20 July 2019 / Revised: 12 August 2019 / Accepted: 15 August 2019 / Published: 16 August 2019
(This article belongs to the Special Issue Microporous/Mesoporous Inorganic Materials)
The electrical characterization of catalysts composed of layered manganese oxide in the form of birnessite supported on γ-Al2O3, which have been successfully used in the combustion of soot, is presented. The results indicate that the electrical conduction and ion conduction processes are influenced by the amount of the active phase. There was also evidence of Grotthuss-type proton conductivity favored by the presence of surface water on the exposed alumina surface. The above is supported by the porous nature of the catalyst in which the surface area varied between 125.2 ± 1.2 and 159.0 ± 1.1 m2/g, evidencing changes in the alumina surface. The conductivity, determined from measurements of impedance spectroscopy, at low frequency showed changes associated with the amount of the active phase. The values ranged from 2.61 × 10−8 ± 2.1 × 10−9 Ω−1·cm−1 (pure alumina) to 7.33 × 10−8 ± 5.9 × 10−9 Ω−1·cm−1, 7.21 × 10−8 ± 5.8 × 10−9 Ω−1·cm−1 and 4.51 × 10−7 ± 3.6 × 10−8 Ω−1·cm−1 at room temperature for catalysts with nominal active phase contents of 5.0, 10.0 and 20.0%, respectively. Such results indicate that it is possible to modulate the electrical properties with variations in the synthesis parameters. View Full-Text
Keywords: supported MnOX; γ-alumina; ionic conductivity; porous materials supported MnOX; γ-alumina; ionic conductivity; porous materials
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MDPI and ACS Style

Arias, N.P.; Becerra, M.E.; Giraldo, O. Electrical Behavior of a Catalyst Composed of Laminar Manganese Oxide Supported on γ-Al2O3. Molecules 2019, 24, 2984. https://doi.org/10.3390/molecules24162984

AMA Style

Arias NP, Becerra ME, Giraldo O. Electrical Behavior of a Catalyst Composed of Laminar Manganese Oxide Supported on γ-Al2O3. Molecules. 2019; 24(16):2984. https://doi.org/10.3390/molecules24162984

Chicago/Turabian Style

Arias, Nayda P.; Becerra, María E.; Giraldo, Oscar. 2019. "Electrical Behavior of a Catalyst Composed of Laminar Manganese Oxide Supported on γ-Al2O3" Molecules 24, no. 16: 2984. https://doi.org/10.3390/molecules24162984

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