کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
63835 | 48255 | 2015 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigation of the characteristics and deactivation of catalytic active center of Cr-Al2O3 catalysts for isobutane dehydrogenation Investigation of the characteristics and deactivation of catalytic active center of Cr-Al2O3 catalysts for isobutane dehydrogenation](/preview/png/63835.png)
Deactivation mechanism of Cr-Al2O3 catalyst and the interaction of Cr-Al in the dehydrogenation of isobutane, as well as the nature of the catalytic active center, were studied using XRD, SEM, XPS, H2-TPR, isobutane-TPR and TPO techniques. The results revealed that the deactivation of Cr-Al2O3 catalyst was mainly caused by carbon deposition on its surface. The Cr3+ ion could not be reduced by hydrogen but could be reduced to Cr2+ by hydrocarbons and monoxide carbon. The active center for isobutane dehydrogenation could be Cr2+/Cr3+ produced from Cr6+ by the on line reduction of hydrocarbon and carbon monoxide. The binding energy of Al3+ was strongly affected by the state of chromium cations in the catalysts.
The active center of Cr-Al2O3 catalyst for the isobutane dehydrogenation was Cr2+/Cr3+ produced from Cr6+ by the reduction of hydrocarbon and carbon monoxide on line. The binding energy of Al3+ was strongly effected by the state of chromium in the catalysts.Figure optionsDownload as PowerPoint slide
Journal: Journal of Energy Chemistry - Volume 24, Issue 1, January 2015, Pages 101–107