The surface acidity of a combustion catalyst based on cobalt oxide on SBA-15 has been studied before and after oxidation of chlorinated alkanes. We report here the spectroscopic evidence for the formation of new Brønsted acidic sites after 1,2-dichloropropane combustion, likely associated with the generation of HCl at high temperature and its dissociative adsorption at the catalyst surface. Lewis acidity originated from exposed Co ions is also enhanced and weakly acidic silanols from the SBA support are still detectable. Thus the properties of the catalyst surface appear to be modified during Cl-VOC conversion
Surface acidity of mesoporous Co/SBA catalyst for catalytic combustion of chlorinated alkanes
Elisabetta Finocchio;Guido Busca;
2017-01-01
Abstract
The surface acidity of a combustion catalyst based on cobalt oxide on SBA-15 has been studied before and after oxidation of chlorinated alkanes. We report here the spectroscopic evidence for the formation of new Brønsted acidic sites after 1,2-dichloropropane combustion, likely associated with the generation of HCl at high temperature and its dissociative adsorption at the catalyst surface. Lewis acidity originated from exposed Co ions is also enhanced and weakly acidic silanols from the SBA support are still detectable. Thus the properties of the catalyst surface appear to be modified during Cl-VOC conversion
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