Calorimetric Characterization of Surface Reactivity of Supported Ga2O3 Catalysts |
| |
| Authors: | Petre A L Auroux A Gervasini A Caldararu M Ionescu N I |
| |
| Institution: | (1) IRC, CNRS, 2 avenue Albert Einstein, 69626 Villeurbanne Cedex, France;(2) Spl. Independentei 202, 77208 Bucharest, Romania;(3) Dipartimento di Chimica Fisica ed Elettrochimica, Universita di Milano, Via Golgi 19, 20133 Milano, Italy |
| |
| Abstract: | The surface properties of supported gallium oxide catalysts prepared by impregnation of various supports (γ-Al2O3, SiO2, TiO2, ZrO2) were investigated by adsorption microcalorimetry, using ammonia and water as probe molecules. In the case of acidic supports
(γ-Al2O3, ZrO2, TiO2), the acidic character of supported gallium catalysts always decreased in comparison with gallium-free supports; on very
weakly acidic SiO2, new acidic centers were created when depositing Ga2O3. The addition of gallium oxide decreased the hydrophilic properties of alumina, titania and zirconia, but increased the amount
of water adsorbed on silica. The catalytic performances in the selective catalytic reduction of NO by C2H4 in excess oxygenwere in the order Ga/Al2O3>Ga/TiO2>Ga/ZrO2>>Ga/SiO2. This order is more related to the quality of the dispersion of Ga2O3 on the support than to the global acidity of the solids.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
| Keywords: | adsorption microcalorimetry H2O NH3 NO reduction supported gallium oxide |
| 本文献已被 SpringerLink 等数据库收录！ |
|
