کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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62283 | 47631 | 2010 | 9 صفحه PDF | دانلود رایگان |

The influence of lanthanum (La) doping on the performance of 37 wt% Cu/ZnO catalysts for the low-temperature water–gas shift (LT-WGS) reaction was investigated. A 2.3 wt% La loading improved catalyst activity compared to the neat Cu/ZnO and Cu/ZnO/Al2O3 systems and was accompanied by a lowering of the activation energy. Higher La loadings promoted the adsorption of H2O at the expense of CO, resulting in a decrease in LT-WGS activity. Additionally, 2.3 wt% La acted to stabilise catalyst activity compared with the neat Cu/ZnO. XPS and H2-TPR assessment demonstrated a strong interaction between Cu and La components, while data from CO and H2O-TPD studies favoured the associative WGS mechanism in this instance. Activity and stability findings also suggested metallic Cu was not responsible for LT-WGS activity.
The influence of La-doping on Cu/ZnO catalyst for low-temperature water–gas shift reaction showed improvement on activation energy and stability of the catalysts to a certain extent, however La loadings above 2.3 wt% promoted H2O adsorption at the expense of CO, thus lowering catalyst activity.Figure optionsDownload high-quality image (69 K)Download as PowerPoint slide
Journal: Journal of Catalysis - Volume 273, Issue 1, 7 July 2010, Pages 73–81