Oxidative dehydrogenation of ethanol on modified OMS-2 catalysts

Recent Manganese Oxide Octahedral Molecular Sieves (OMS–2) with Isomorphically Substituted Cationic Dopants and Their Catalytic Applications

“…In this case, it was suggested that the higher reducibility of surface Mn 4+ species and the existence of a collaborative effect between Mn and Fe species could facilitate the decomposition of O 3 to obtain active oxygen atoms that improve the mobility of surface oxygen of the catalyst [100]. Similar trends were observed for Fe-doped cryptomelane materials used in the oxidative dehydrogenation of ethanol [194].…”

Insights and Activation Energy Surface of the Dehydrogenation of C2HxO Species in Ethanol Oxidation Reaction on Ir(100)

“…[31,32] The most studied metal catalysts are Pt, [33][34][35][36] Pd, [35,[37][38][39] Ir, [35,38,40] Ni, [41] and Cu [42][43][44][45] while others were also investigated. [46][47][48][49][50][51][52] To improve the catalytic activities of single metal catalysts, alloying different metal(s) has been an active research field, such as PdNi, [53][54][55] PtNi, [56] CuPd [57][58][59] CuZn, [60] CuZr, [61] CuM, [62] and IrRu. [63] Through studies of dehydrogenation network is critical for CÀ C bond cleavage, which may take place at different intermediates depending on the catalysts.…”

“…Many catalysts were explored for their effectiveness and selectiveness in dehydrogenation reactions involving ethanol [31,32] . The most studied metal catalysts are Pt, [33–36] Pd, [35,37–39] Ir, [35,38,40] Ni, [41] and Cu [42–45] while others were also investigated [46–52] . To improve the catalytic activities of single metal catalysts, alloying different metal(s) has been an active research field, such as PdNi, [53–55] PtNi, [56] CuPd [57–59] CuZn, [60] CuZr, [61] CuM, [62] and IrRu [63] .…”

Effect of metal-doping (Me = Fe, Ce, Sn) on phase composition, structural peculiarities, and CO oxidation catalytic activity of cryptomelane-type MnO2

“…The oxygen-containing ability in the crystalline lattice of manganese oxides and its capacity allows creating materials with different structures and manganese oxidation states to vary the catalytic property [7,8]. The manganese oxide modification with different metal dopants (Me n+ = Sn 4+ [9,10,11,12], Ru 3+ [13], Ni 2+ [14], Co 2+ , Fe 3+ [15,16,17,18,19,20], Cu 2+ [21,22], V 5+ [23], Ce 4+ [24,25,26,27,28,29] etc.) may additionally enhance the activity of manganese oxide towards oxidation reactions.…”

“…Despite the prospects to improve the catalytic performance, the effect of modification on the catalytic activity of OMS-2 sometimes remains controversial. A common problem with the introduction of modifiers is that some cations may not only fail to preserve the OMS-2 structure, but, on the contrary, prevent its formation in a wide range of concentrations, and also adsorb on the surface of MnO2 particles or form the particles of a separate phase depending on the preparation conditions [10,25,41,42]. This can differently affect the catalytic properties of the modified samples either enhancing the performance or deactivating the catalyst.…”