Abstract
A series of catalysts were prepared using the kneading molding method and the impregnation method as well as the dry mix method by using different raw materials. By using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) techniques, we studied the relationship between the catalyst performance and the Cr-Al interaction in the catalytic dehydrogenation of isobutane. The results demonstrated that the Cr-Al interaction in the catalyst had a direct influence on the catalytic activity and the selectivity of isobutene. The catalysts prepared using the kneading molding method had higher catalytic activity and isobutene selectivity than those prepared using the dry mix method. By comparison, XRD, XPS, and TPR results showed that the greater the Cr-Al interaction in the catalyst was, the higher the catalytic activity was. Here, we propose a mechanism of isobutane dehydrogenation.
Highlights
Isobutylene is a major component of methyl tert butylether (MTBE) and methacrylate synthesis
By using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) techniques, we studied the relationship between Cr-Al interaction and the performance of the CrAl2O3 catalyst as well as the nature of the catalytic active center
TPR results demonstrated that all the samples contained CrO3, and these results were consistent with the XPS results, and their amounts increased as the Cr-Al interaction increased
Summary
Isobutylene is a major component of methyl tert butylether (MTBE) and methacrylate synthesis. Isobutylene is produced industrially by the endothermic dehydrogenation of isobutene by using the Cr2O3-Al2O3 catalyst at 900 K with a residence time of approximately 1 s. (2015) Relationship between Cr-Al Interaction and the Performance of Cr-Al2O3 Catalysts for Isobutane Dehydrogenation. The knowledge of the relationship between the Cr-Al interaction and the catalytic performance of chromium catalysts in isobutane dehydrogenation remains limited; systematic research on this reaction is required. By using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) techniques, we studied the relationship between Cr-Al interaction and the performance of the CrAl2O3 catalyst as well as the nature of the catalytic active center. We obtained a considerable amount of valuable information on the relationship between catalyst performance and the Cr-Al interaction in the dehydrogenation of isobutane. Based on a literature search, this is the first report on the effect of Cr-Al interaction on the performance of catalysts in the dehydrogenation of isobutane
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