Characterization and reactivity of α-Al2O3-supported Pt-Co bimetallic catalysts

Abstract

Bimetallic Pt–Co and monometallic Pt and Co catalysts in as‐prepared and reduced states were characterized by X‐ray diffraction, temperature‐programmed reduction, XPS and Farier transform infrared spectroscopy (FTIR). Temperature‐programmed reduction and XPS results showed that the addition of platinum lowered the reduction temperature of cobalt oxides and simultaneously increased the amount of cobalt surface phase. The metallic Pt and Co in bimetallic Pt–Co catalysts was found to be highly dispersed in supports. In situ FTIR study of CO adsorption on catalysts confirmed that there was either strong interaction between metallic Pt and Co, or a Pt–Co bimetallic interphase was formed. The CO2 reforming of methane to synthesis gas was also investigated. Both Pt and Co in Pt–Co bimetallic catalysts exerted catalytic activity on CO2 reforming of methane. The coking was effectively inhibited over Pt–Co bimetallic catalysts, which was attributed to the formation of a Pt–Co bimetallic interphase and the increase of cobalt surface phase. Copyright © 1999 John Wiley & Sons, Ltd.

Promotion Effects in Co‐Based Fischer—Tropsch Catalysis

“…102 The existence of Co-Pt interactions in these catalytic systems was further confirmed by Tang et al making use of IR with CO as probe molecule. 104 The results suggested that there was a strong interaction between Pt and Co atoms. Very recently, Jacobs et al have reported on Co-Pt/Al 2 O 3 catalysts investigated by EXAFS at the Pt L-edge, and they concluded that isolated Pt atoms interact with the supported cobalt clusters without forming Pt-Pt bonds.…”

Fischer–Tropsch synthesis: study of the promotion of Re on the reduction property of Co/Al2O3 catalysts by in situ EXAFS/XANES of Co K and Re LIII edges and XPS

“…For gas-to-liquid (GTL) technology, cobalt catalysts are considered promising [1,2] due to their low water-gas shift (WGS) activity. On the other hand, Fe-based catalysts are often employed for coal-derived syngas, since the intrinsic WGS activity is Pt, and Re [4,[13][14][15][16][17][18][19][20][21][22][23] are often employed to facilitate the reduction of cobalt species interacting with the support and thereby generate more available active cobalt metal surface sites to participate in synthesis.…”

Structural and Chemical Effects of Plasma Treatment on Close‐Packed Colloidal Nanoparticle Layers

“…[21][22][23][24][25] Due to their bimetallic nature, additional degrees of complexity can arise as the two components might interact differently with the plasma.…”