FT-IR STUDY OF CH3OH ADSORPTION ON CHLORINATED GAMMA-ALUMINAS

In a previous paper, the surfaces of as-received or CI-treated alumina s were studied, In this work, the action of CH3OH molecules on pure or Cl- treated alumina was analyzed using FT-IR spectrometry. The methox ylation of all surfaces was observed through the presence of OCH3 link ed to Al-VI or AI(IV). Above 470K, the methoxy group tended to disappe ar and a new species, formate, was found. The positions of nu(CH3) fre quencies depended on the production process of alumina powders as well as on their treatment. The modification of the evolution into formate at the different surfaces was discussed. (C) 1998 Elsevier Science Li mited. All rights reserved.