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ZrO2 itself was found be active for the dehydrogenation of ethylbenzene, especially in the presence of CO2, which was aimed to be utilized as an oxidant. This positive effect of CO2 was highly dependent on the crystalline phases of zirconia. The higher the tetragonal phase contained in ZrO2, the higher the ethylbenzene conversion and styrene selectivity that were obtained. Highly tetragonal ZrO2 was...
The oxidative dehydrogenation of 4-vinylcyclohexene (VCH) into styrene was carried out in the presence of oxygen over a ZrO2 catalyst promoted with Fe2O3 and CaO. Intrinsically, ZrO2 showed high dehydrogenation activity, which resulted in 80% styrene selectivity with 45% conversion at 425 °C and LHSV 3 h−1. When the ZrO2 was further promoted with calcium and iron, CaO/Fe2O3/ZrO2, the highest styrene...
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