Correlating ethylene glycol reforming activity with in-situ EXAFS detection of Ni segregation in supported NiPt bimetallic catalysts

Journal Article · Wed Oct 31 00:00:00 EDT 2012 · ACS Catalysis, 2(11):2290-2296

DOI:https://doi.org/10.1021/cs3004227· OSTI ID:1054468

Trupy, Sarah A; Karim, Ayman M; Bagia, Christtina; Deng, Weihua; Huang, Yulin; Vlachos, Dionisios G; Chen, Jingguang

The structural changes in supported NiPt/C and NiPt/γ-Al2O3 catalysts were investigated using in-situ extended X-ray absorption fine structure (EXAFS) under aqueous phase reforming (APR) of ethylene glycol conditions. Reverse Monte Carlo is introduced to analyze the EXAFS data. Parallel reactor studies of APR of ethylene glycol showed that NiPt catalysts were initially more active than monometallic Pt catalysts. The enhanced activity was correlated to changes in the catalyst structure. Under APR conditions, Ni segregated to the surface of the catalysts, resembling Ni-terminated bimetallic surfaces that were predicted to be more active than Pt from theoretical and experimental studies on model surfaces.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1054468
• Report Number(s): PNNL-SA-89894; 46195; BM0101010
• Journal Information: ACS Catalysis, 2(11):2290-2296, Journal Name: ACS Catalysis, 2(11):2290-2296
• Country of Publication: United States
• Language: English

Related Subjects

Environmental Molecular Sciences Laboratory