In situ DRIFTS study on the methanol oxidation by lattice oxygen over Cu/ZnO catalyst

✍ Scribed by Shawn D. Lin; Hongkui Cheng; Ting C. Hsiao

• Book ID: 103835363
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 619 KB
• Volume: 342-343
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2011.04.007

✦ Synopsis

Previous research shows that lattice oxygen of Cu catalyst participates in the methanol conversion. In this study, Cu/ZnO catalyst was pretreated to become fully oxidized, partially reduced, or completely reduced. In situ diffuse-reflectance infrared Fourier-transformed spectroscopy (DRIFTS) was used to analyze the methanol (MeOH) adsorption at 393 K and a following stepwise temperature-programmed desorption (sTPD). In addition to methoxy and formates appeared after MeOH adsorption, Cu/ZnO catalyst had formaldehyde but no CO 2 while the Cu was completely reduced. When the Cu was in the oxidized or partially reduced states, CO 2 formed and more formate appeared. Lattice oxygen participated in the MeOH conversion, and the reactivity was higher in the partially reduced Cu/ZnO than in the oxidized Cu/ZnO. This suggests that reduced Cu catalyzes the reaction between MeOH adspecies and lattice oxygen.