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

被引：29
作者：
Pighini, C. [1 ]
Belin, T. [1 ]
Mijoin, J. [1 ]
Magnoux, P. [1 ]
Costentin, G. [2 ]
Lauron-Pernot, H. [2 ]
机构：
[1] Univ Poitiers, LACCO, UMR CNRS 6503, F-86022 Poitiers, France
[2] Univ Paris 06, UPMC, UMR CNRS 7609, Lab React Surface, F-75005 Paris, France
来源：
APPLIED SURFACE SCIENCE | 2011年 / 257卷 / 15期
关键词：
Magnesium oxide; Basic properties; CO2; adsorption; Microcalorimetry; Infrared spectroscopy; SURFACE ACID/BASE PROPERTIES; ISOVALENT IMPURITY CATIONS; HYDROXYL-GROUPS; BRONSTED BASICITY; GAS-ADSORPTION; METAL-OXIDES; MGO POWDERS; ENTROPY; SITES; REACTIVITY;
D O I：
10.1016/j.apsusc.2011.03.040
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Both Lewis and Bronsted 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 Bronsted 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 Bronsted 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. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：6952 / 6962
页数：11
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