Characterization and activity of V2O5/CeO2-MgO catalyst in the dehydrogenation of ethylbenzene to styrene

Mesoporous ceria-supported vanadia catalysts for selective aerobic oxidation of ethylbenzene

“…Solid-state reactions between ceria and vanadia may lead to the formation of orthovanadate crystals which may further contribute to the blockage of ceria pores. 41,42 In the Raman spectra of CeO 2 and CV samples (Fig. 3), there is a prominent band at 468 cm À1 corresponding to the F 2g vibrational mode, indicating the symmetrical coordination of surrounding oxygen atoms around Ce 4+ ions in the CeO 2 lattice.…”

“…Solid-state reactions between ceria and vanadia may lead to the formation of orthovanadate crystals which may further contribute to the blockage of ceria pores. 41,42…”

A green chemistry approach to styrene from ethylbenzene and air on MnxTi1−xO2catalyst

“…Nonetheless, the sustainable activity observed for 45 h demonstrates the importance of thermodynamically stable rutile phase as support with Mn 3 O 4 as the active catalyst. Compared to the systems reported in the literature, [8][9][10][11][12][13][14][15][16][17][18][19][20][21] Mn 3 O 4 supported over rutile TiO 2 is attractive, especially in terms of stability, and yield.…”

“…10 Venugopal et al has shown ceria containing hydrotalcite at 450 C at atmospheric pressure a marginally decreasing styrene yield from 47 to 45% over a period of 72 h. 11 Shin et al fed a balancing gas of water and EB in helium, over V 2 O 5 /CeO 2 -MgO and achieved EB conversion of 43% and ST selectivity of 91% at 600 C; prior to the activity measurement, the catalyst was activated in the steam ow of 50 mL min À1 by heating up to 650 C at the rate of 2.5 C min À1 . 12 Sivaranjani et al employed V-doped titania with molecular oxygen at 500 C and obtained about 50% ST yield initially; however it continuously decreases at higher time on stream. 13 Various oxidants such as O 2 , 13,14 air, 15 N 2 O 16 and CO 2 17 have been used, and indeed, air as oxidant is cost effective and preferred green way of oxidation.…”

“…Design of catalysts which are stable, gives high selectivity (>90%) with conversion >50% for EB to ST conversion at lower temperatures around 500 C or lower is one of the challenges in the eld of heterogeneous catalysis. [8][9][10][11][12][13][14][15][16][17][18] Constant efforts have been made to develop catalysts, operating via oxidative dehydrogenation (ODH) mechanism route which is also exothermic in nature 19 to lower operating temperature for EB to ST conversion. 20,21 Manganese is known for its superior catalytic properties for various redox processes in heterogeneous catalysis.…”