Jump to main content
Jump to site search

Issue 22, 2011
Previous Article Next Article

How to determine IR molar absorption coefficients of co-adsorbed species? Application to methanol adsorption for quantification of MgO basic sites

Author affiliations

Abstract

Methanol adsorption on MgO samples with different morphologies is studied by infrared (IR) spectroscopy coupled to volumetry or thermogravimetry measurements to probe qualitatively and quantitatively the acid–base paired sites. The molar absorption coefficients of ν(OC) vibration of non-dissociated methanol, type I and type II methoxy species are determined by analyzing data obtained under specific adsorption conditions (εND = 2.5 cm μmol−1; εI = εII = 6.1 cm μmol−1). Thanks to these results, the amounts of different adsorbed methanol species are evaluated. These various species are formed on surface sites presenting different topologies. Hence, the IR method is the only one allowing us to both discriminate and quantify the defects on the MgO surfaces, in terms of concentrations of convex and concave defective zones. This study reveals that sol–gel preparation leads to a MgO surface presenting a greater amount of concave defective zones than precipitated MgO.

Graphical abstract: How to determine IR molar absorption coefficients of co-adsorbed species? Application to methanol adsorption for quantification of MgO basic sites

Back to tab navigation

Publication details

The article was received on 03 Dec 2010, accepted on 18 Mar 2011 and first published on 09 May 2011


Article type: Paper
DOI: 10.1039/C0CP02767G
Citation: Phys. Chem. Chem. Phys., 2011,13, 10797-10807
  •   Request permissions

    How to determine IR molar absorption coefficients of co-adsorbed species? Application to methanol adsorption for quantification of MgO basic sites

    B. Moulin, L. Oliviero, P. Bazin, M. Daturi, G. Costentin and F. Maugé, Phys. Chem. Chem. Phys., 2011, 13, 10797
    DOI: 10.1039/C0CP02767G

Search articles by author

Spotlight

Advertisements