Dehydrogenation of Ethylbenzene in the Presence of CO2 over V Catalysts Supported on Nano-sized Alumina

Abstract

Nanocrystalline alumina was prepared and was employed as a support for vanadium catalysts. The catalysts were characterized by N 2 adsorption/desorption, X-ray diffraction, TPR, UV-Vis, NH 3 -TPD, and CO 2 -TPSR. The activity and selectivity of the catalysts in ethylbenzene dehydrogenation in the presence of CO 2 were compared with vanadium supported on commercial available alumina. The catalytic activity, selectivity, and stability were enhanced by the use of nanocrystalline alumina as catalyst supports. The superior performance of the present nano-crystalline alumina catalysts was attributed to the higher surface areas, higher vanadium dispersion, and higher stability of V 5+ against reduction.

Photocatalytic degradation of phenol by char/N-TiO 2 and char/N-F-TiO 2 composite photocatalysts

“…Small crystal size and % strain values are known [22,23] to be beneficial for photocatalytic activity of TiO 2 . The low crystal size values observed in the present study are consistent with previous studies reporting that doping of TiO 2 with non-metals such as N, F, I [2,7,[24][25][26] affects the crystallite size growth of TiO 2 leading to smaller crystallite size. In addition, the presence of carbonaceous surfaces in composite TiO 2 catalysts was found to inhibit also the crystallite growth and/or suppress TiO 2 aggregation [13,27].…”

Supported vanadium oxide in heterogeneous catalysis: elucidating the structure–activity relationship with spectroscopy

“…In modern heterogeneous catalysis, supported vanadium oxide catalysts constitute a very important class of catalytic materials. They have become the model for catalytic systems for fundamental studies of supported metal oxides and they are widely used as selective oxidation catalysts in the industrial production of economically attractive redox reactions, like the oxidation of methane, [1][2][3][4][5][6][7] propane, 8,9 butane, [10][11][12] toluene, [13][14][15][16][17] benzene, 18,19 propene, 20 o-xylene, 21 methanol, [22][23][24][25][26][27][28] ethanol, 29,30 formaldehyde, 31 several oxidative dehydrogenations, [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]…”

An efficient palladium membrane reactor to increase the yield of styrene in ethylbenzene dehydrogenation

“…Ethylbenzene (EB) dehydrogenation as a representative process for the production of styrene is performed on the promoted iron oxide catalysts in the presence of a large quantity of steam at high temperatures of 600-700 • C [1][2][3][4][5][6]. Since this process is equilibrium limited and high energy consuming, there is a strong incentive for investigators to exploit new process which could reduce the cost of styrene production [7,8].…”