Abstract:

The increased daily demand for isobutan, an important raw material, has brought the dehydrogenation of isobutan to a remarkable position. The catalyst synthesis of this endothermal balance-limited reaction is extremely important. It is known that monochromates are the most active species for Cr-based catalysts. This study aims to investigate the effects of Cr content on the catalyst structure of Cr@MCM-41, the types and quantities of chromates. For this purpose, the catalyst support is first synthesized as hydrothermal MCM-41 and then prepared with the technique of absorbing the catalysts xCr@MCM-41 (x:4,6,8,10) in different percentages of mass. Synthesized catalysts, XRD, DR-UV vis, XPS, N2 ads./des. Analysis and characterization studies have been carried out. As the cr content increases, the activity for isobutan dehydrogenation has been determined to increase in the catalyst structure of cr2O3 crystal formations. The active monochromatic type for reaction was obtained at the highest rate on the 4Cr@MCM-41 catalyst, crystal formations were not observed only in this catalyst structure. 4Cr@MCM-41 catalyst tests (600oC, atmospheric) resulted in high isobutan conversions (80%) up to 60 minutes and high isobutan selectivity (95%) after 40 minutes. For the xCr@MCM-41 catalysts synthesized by the absorption technique, the mass content of 4% Cr is shown to be a suitable ratio in terms of high isobute selectivity and high quantity of monochromatic formation.

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