Bimetallic Nickel–Cobalt Nanosized Layers Supported on Polar ZnO Surfaces: Metal–Support Interaction and Alloy Effects Studied by Synchrotron Radiation X-ray Photoelectron Spectroscopy

2012 ◽  
Vol 116 (18) ◽  
pp. 10048-10056 ◽  
Author(s):  
Y. T. Law ◽  
T. Skála ◽  
I. Píš ◽  
V. Nehasil ◽  
M. Vondráček ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Support Interaction ◽  
Nickel Cobalt ◽  
Metal Support Interaction ◽  
Metal Support

BaO-Modified Pd-Based Catalyst for Methanol Oxidation

2012 ◽  
Vol 610-613 ◽  
pp. 577-580
Author(s):  
Xue Qiao Zhang ◽  
Ming Zhao ◽  
Zhi Xiang Ye ◽  
Sheng Yu Liu ◽  
Yao Qiang Chen
Keyword(s):  
Methanol Oxidation ◽  
Photoelectron Spectroscopy ◽  
Impregnation Method ◽  
Complete Conversion ◽  
X Ray ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Temperature Programmed ◽  
Conversion Temperature

Pd-based catalysts modified with BaO as a promoter was prepared by impregnation method. The catalyst was characterized by H2-temperature-programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS). The catalytic activity towards methanol showed that the BaO modification promoted the conversion of methanol. The light-off temperature (T50), complete conversion temperature (T90) and ΔT (T90-T50) for methanol oxidation are 100°C, 125°C and 25°C, respectively. The H2-TPR results showed that the addition of BaO increased palladium highly dispersed and promoted the reductive ability. It also enhanced the metal-support interaction and increased the electronic surroundings of Pd and Ce sites, which maintained Pd in a higher oxidized state and Ce4+ in Ce3+ state, consequently increased the activity for methanol oxidation according to XPS measurements.

Evaluation of the Physiochemical Properties of Molybdenum Supported Catalysts

2012 ◽  
Vol 488-489 ◽  
pp. 206-210
Author(s):  
Muhammad Farooq ◽  
Anita Ramli ◽  
Duvvuri Subbarao
Keyword(s):  
Photoelectron Spectroscopy ◽  
Supported Catalysts ◽  
Analytical Techniques ◽  
Binding Energies ◽  
Impregnation Method ◽  
Physiochemical Properties ◽  
X Ray ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Temperature Programmed

Molybdenum catalysts supported on γ-Al2O3and γ-Al2O3-MgO mixed oxide with varying loading of MgO (5, 10, 15, 20 wt% with respect to γ-Al2O3) were prepared successfully by wet impregnation method. The physiochemical properties of these synthesized Mo catalysts were studied by various analytical techniques such as N2adsorption–desorption (BET), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Temperature-programmed reduction (TPR).The results showed that the addition of MgO into the support affected the binding energies of the elements and reducibility of the metal oxides formed after calcination of catalyst samples due to change in metal-support interaction. Further, the characterization techniques showed that the active metal was well dispersed on the surface of support material.

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