Mixed MVSb oxides as oxidehydrogenation catalysts

Catalytic dehydrogenation of ethylbenzene with carbon dioxide: promotional effect of antimony in supported vanadium–antimony oxide catalyst

“…It is generally accepted that active sites for these systems are to be the surface vanadium cations operating according to a Mars-van-Krevelen redox mechanism. It can consequently be suggested that the easier redox cycle is an important factor to design the more effective catalyst [35]. The results of the study of oxidative dehydrogenation of lower paraffins over VO x /Al 2 O 3 and V 0.9 Sb 0.1 O x /Al 2 O 3 catalysts by differential scanning calorimetry show that reaction occurs via a stepwise redox mechanism with the participation of lattice oxygen from the catalyst [47].…”

“…Meanwhile, it is known that various V-containing oxide systems, such as V-Mg, V-Cr, V-P, V-Mo, V-Sb, etc. are active and selective in the relative reactions of selective oxidation, oxidative dehydrogenation and ammoxidation of lower paraffins and alkylaromatics [27][28][29][30][31][32][33][34][35], including the oxidative EBDH with oxygen [32][33][34][35]. However, V-containing catalysts for the CO 2 -EBDH reaction have been reported only by few groups [13][14][15][16][23][24][25][26].…”

An Overview on the Dehydrogenation of Alkylbenzenes with Carbon Dioxide over Supported Vanadium–Antimony Oxide Catalysts

“…Vanadium species only are considered to be active sites in V-Sb/Al catalysts because the reducibility of surface antimony ions is much lower as compared to that of vanadium ions as shown by previous XPS and reducibility studies of this type of catalysts [30,51]. In general, the reduced V-site contains surface oxygen vacancy that might be associated with either one V 3+ or two V 4+ atoms in the lattice [52].…”

“…V-Mg, V-Cr, V-P and V-Sb, are active and selective in oxidation reactions of hydrocarbons such as partial oxidation, ammoxidation and oxydehydrogenation [22][23][24][25][26][27][28][29][30] including O 2 -EBDH [27][28][29][30]. These systems can be also considered as potentially efficient catalysts for the CO 2 -EBDH, and, in fact, some Vcontaining catalysts have exhibited good performance in this reaction [8, 12, 13, 16-18, 21, 31-37].…”

Utilization of carbon dioxide as soft oxidant in the dehydrogenation of ethylbenzene over supported vanadium–antimony oxide catalysts

“…[14][15][16][20][21][22] These catalysts were actually known to be active and selective in partial oxidation, oxidative dehydrogenation, and ammoxidation of hydrocarbons. [23][24][25][26][27][28][29][30][31][32][33][34] Suzuki and coworkers reported that active carbon-supported vanadium catalysts afforded high catalytic activity in the EBDH to give styrene in the presence of carbon dioxide. [14][15][16] However, it suffered from severe catalyst deactivation due to coke deposition.…”