IN-SITU IR STUDIES ON THE MECHANISM OF METHANOL SYNTHESIS OVER AN ULTRAFINE CU ZNO/AL2O3 CATALYST/

Methanol synthesis from CO2 and CO/CO2 hydrogenation was carried out u nder real reaction conditions over an ultrafine Cu/ZnO/Al2O3 (Cu/Zn/Al =60/30/10, molar ratio) catalyst. The formation and variation of surfa ce species were recorded by in situ FT-IR spectroscopy. The mechanisms of methanol synthesis and RWGS reaction were discussed. The result re vealed that methanol was formed directly from CO2 hydrogenation for CO 2/H-2 Or CO/CO2/H-2 reaction systems. b-HCOOs- was the necessary inter mediate for methanol synthesis. A scheme of methanol and RWGS reaction was proposed. (C) 1998 Elsevier Science B.V. All rights reserved.