Study of high-temperature hydrogen reduced Pt0/TiO2 by X-ray photoelectron spectroscopy combined with argon ion sputtering—Diffusion-encapsulation effect in relation to strong metal–support interaction

2012 ◽  
Vol 258 (8) ◽  
pp. 3991-3999 ◽  
Author(s):  
Jingwei Zhang ◽  
Min Zhang ◽  
Zhensheng Jin ◽  
Jingju Wang ◽  
Zhijun Zhang
Keyword(s):  
High Temperature ◽  
Photoelectron Spectroscopy ◽  
Ion Sputtering ◽  
X Ray ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Argon Ion ◽  
Strong Metal Support Interaction

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.

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