首页>
中文期刊>
《能源化学:英文版》
>Investigation of the characteristics and deactivation of catalytic active center of Cr-AI203 catalysts for isobutane dehydrogenation
Investigation of the characteristics and deactivation of catalytic active center of Cr-AI203 catalysts for isobutane dehydrogenation
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.
展开▼