Optimization of Mn‐Mg‐Al Mixed Oxides Composition on their Activity towards the Total Oxidation of Aromatic and Oxygenated VOCs

A series of mixed oxides (Mn‐Mg‐Al) is prepared by coprecipitation via a hydrotalcite route with different manganese ratios. Structural, textural, and redox properties are studied by XRD, N2‐sorption, H2‐TPR, and XPS techniques. MnxMg6‐xAl2‐O mixed oxides (with 0≤x≤6) are tested in the total oxidati...

Full description

Saved in:
Bibliographic Details
Published in:European journal of inorganic chemistry 2023-07, Vol.26 (20), p.n/a
Main Authors: El Khawaja, Rebecca, Rochard, Guillaume, Genty, Eric, Poupin, Christophe, Siffert, Stéphane, Cousin, Renaud
Format: Article
Language:English
Subjects:
Aging (metallurgy)
Aluminum oxide
Catalysts
Catalytic activity
Chemical Sciences
Commercial Pd/γ-Al2O3
Composition
Ethanol
Inorganic chemistry
Layered Double Hydroxides
Magnesium
Manganese
Mixed oxides
Mn oxidation states
Noble metals
Optimization
Oxidation
Oxidation of VOCs
Oxygenation
Palladium
Toluene
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A series of mixed oxides (Mn‐Mg‐Al) is prepared by coprecipitation via a hydrotalcite route with different manganese ratios. Structural, textural, and redox properties are studied by XRD, N2‐sorption, H2‐TPR, and XPS techniques. MnxMg6‐xAl2‐O mixed oxides (with 0≤x≤6) are tested in the total oxidation of ethanol and toluene, two probe molecules representing respectively oxygenated and aromatic VOCs. Catalysts with higher manganese contents have shown the best catalytic performance for the oxidation of both ethanol and toluene. The surface activity of the materials is mainly related to the presence of manganese species in three different oxidation states (+II, +III, and +IV) in the bulk and on the material's surface. Since high Mn‐content catalysts showed similar physicochemical properties and catalytic activity, Mn4Mg2‐O is selected as the optimal composition of these materials. Furthermore, its aging test is compared to that of noble metal‐based commercial catalysts (Pd/γ‐Al2O3). This study examines the influence of the Mn/Mg ratio on the physicochemical properties and catalytic activity of MnxMg6‐xAl2‐O catalysts. H2‐TPR results demonstrate that as Mn‐content in the material increases, so does the reducibility of manganese species. Thus, for the total oxidation of ethanol and toluene, better catalytic performance is observed for the rich Mn‐based materials.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202300213