Oxidative Dehydrogenation (ODH) of Ethylbenzene with $$\hbox {CO}_{2}$$ CO 2 and $$\hbox {N}_{2}\hbox {O}$$ N 2 O over Heteropolycompounds

Abstract

Heteropolyacids of Keggin structure, H 3 PMo 12 O 40 , H 3 PMo 11 WO 40 and the salts K 3 PMo 11 WO 40 and K 2.5 Fe 0.08 H 0.26 PMo 11 WO 40 were characterized by X-ray diffraction (XRD), UV-Vis spectroscopy, Fourier transform infrared (FTIR), low-temperature nitrogen adsorption and 31 P MAS NMR spectroscopy. The acid-base properties were evaluated using the isopropanol decomposition. They were tested in oxidative dehydrogenation (ODH) of ethylbenzene in the temperature range 300-400 • C at atmospheric pressure with the mild oxidants carbon dioxide and nitrous oxide, the major actors in the greenhouse effect. The results show that the best compromise between conversion and selectivity is obtained for the mixed K/Fe salt of PMo 11 WO 40 at a relatively low temperature, namely 350 • C.

Effect of Carbon Dioxide on Oxidative Ethylbenzene Dehydrogenation in the Presence of Aluminum-Chromium Catalysts

“…With this important to note that the water molecules formed can promote the desorption of styrene product molecules from the catalyst surface and increase the selectivity of the process. In this regard, there is an intensive search for oxidants for the catalytic oxidation of EB in St. To the number of like oxidantrefers O 2 , SO 2 , N 2 O, CO 2 [2][3][4][5][6][7]. The latter compound, as a mild oxidizing agent, is the subject of ever-expanding research.…”

“…and Kamaraju S.R.R. showed that the process on Co 3 O 4 /Al 2 O 3 proceeds in a twostep way (equations 2 and 3) [18]; In [4], the authors suggest that the process on KFePMo11W proceeds in a one-step way (1); Pak and Wislovsky [19], as well as Shuwei [12] showed that EB [20] they found that the greatest yield of styrene and selectivity for styrene in the presence of CO 2 .…”