Microcalorimetric and thermodynamic studies of CO2 and methanol adsorption on magnesium oxide

Both Lewis and BrAPGnsted basic properties of magnesium oxide (MgO) are, respectively, studied by adsorption of CO2 and methanol CH3OH. Various chemical synthesis of pure magnesium oxide (commercial, sol-gel and precipitation methods) are used. The influence of small amounts of alkaline (Na+ and Li+...

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Bibliographic Details
Published inApplied surface science Vol. 257; no. 15; pp. 6952 - 6962
Main Authors PIGHINI, C, BELIN, T, MIJOIN, J, MAGNOUX, P, COSTENTIN, G, LAURON-PERNOT, H
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier 15.05.2011
Subjects
Adsorption
Carbon dioxide
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Magnesium oxide
Methyl alcohol
Physics
Precipitation
Strength
Surface chemistry
Synthesis
Basic properties
Infrared spectroscopy
adsorption
Inorganic compounds
Thermodynamic model
Magnesium oxide
Infrared spectra
Microcalorimetry
CO
Organic compounds
Methanol
Carbon oxides
microcalorimetry
isovalent impurity cations
hydroxyl-groups
surface acid/base properties
thin-films
gas-adsorption
bronsted basicity
basic properties
magnesium oxide
catalysts
metal-oxides
clean mgo surfaces
co2 adsorption
probe molecules
infrared spectroscopy
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Summary:Both Lewis and BrAPGnsted basic properties of magnesium oxide (MgO) are, respectively, studied by adsorption of CO2 and methanol CH3OH. Various chemical synthesis of pure magnesium oxide (commercial, sol-gel and precipitation methods) are used. The influence of small amounts of alkaline (Na+ and Li+) and alkaline-earth (Ca2+) cations is also reported. The amount and the strength of Lewis and BrAPGnsted basic sites are determined by heat flow microcalorimetry. As observed with doped MgO samples, the amount of basic sites is increased but the strength of these sites remains the same. The observed strength of BrAPGnsted sites is generally lower than the Lewis ones. These measurements reveal trends based on the synthesis process that can have an important impact on these basic properties.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2011.03.040