Effect of Oxygen Capacity and Oxygen Mobility of Pure Bismuth Molybdate and Multicomponent Bismuth Molybdate on their Catalytic Performance in the Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene

Abstract

Pure bismuth molybdate (c-Bi 2 MoO 6 ) and multicomponent bismuth molybdate (Co 9 Fe 3 Bi 1 Mo 12 O 51 ) catalysts were prepared by a co-precipitation method, and were applied to the oxidative dehydrogenation of n-butene to 1,3-butadiene. The Co 9 Fe 3 Bi 1 Mo 12 O 51 catalyst showed a better catalytic performance than the c-Bi 2 MoO 6 catalyst in terms of conversion of n-butene and yield for 1,3-butadiene, indicating that the multicomponent bismuth molybdate was more efficient than the pure bismuth molybdate in the oxidative dehydrogenation of n-butene. It was revealed that the crucial factor determining the catalytic performance of Bi-Mo-based catalyst in the oxidative dehydrogenation of n-butene is not the amount of oxygen in the catalyst involved in the reaction (oxygen capacity) but the intrinsic mobility of oxygen in the catalyst involved in the reaction (oxygen mobility). The enhanced catalytic performance of Co 9 Fe 3 Bi 1 Mo 12 O 51 was due to its facile oxygen mobility.

Production of 1,3-Butadiene From C4 Raffinate-3 Through Oxidative Dehydrogenation of n-Butene Over Bismuth Molybdate Catalysts

“…In order to confirm the fact that multicomponent bismuth molybdate catalysts are more active than pure bismuth molybdate catalysts in this reaction, the catalytic performance of c-Bi 2 MoO 6 and Co 9 Fe 3 BiMo 12 O 51 was tested and compared. Figure 23 shows the catalytic performance of c-Bi 2 MoO 6 and Co 9 Fe 3 BiMo 12 O 51 in the oxidative dehydrogenation of n-butene at 420°C after a 6-h-reaction [54]. Conversion of n-butene over Co 9 Fe 3 BiMo 12 O 51 catalyst was much higher than that over c-Bi 2 MoO 6 catalyst, while selectivity for 1,3-butadiene over Co 9 Fe 3 BiMo 12 O 51 catalyst was slightly lower than that over c-Bi 2 MoO 6 catalyst.…”

Partial Oxidation of Propylene over as Prepared and Acid Enriched Bi2Mo1-xWxO6 System

“…Except [27,28]. In the literature, XPS is considered to be a potent means to estimate oxygen mobility in the crystal lattice [29]. Among the three types of oxygen reported, I, II and III, Type I oxygen has lowest binding energy (~530 eV) and is bonded strongly to the metal ions, type II is the oxygen which has highest binding energy (~533 eV) and is weakly bonded to the oxide surface whereas the type III oxygen with intermediate binding energy is considered as the measure of oxygen mobility.…”

Effect of Calcination Temperature on the Catalytic Performance of γ-Bi2MoO6 in the Oxidative Dehydrogenation of n-Butene to 1,3-Butadiene

“…According to this mechanism, oxygen in the catalyst directly reacts with n-butene, and in turn, oxygen in the gas phase makes up oxygen vacancy in the catalyst [10,11]. This means that oxygen mobility of bismuth molybdates plays an important role in determining the catalytic performance in the oxidative dehydrogenation of n-butene [12][13][14][15]. Therefore, it is expected that a bismuth molybdate catalyst with facile oxygen mobility will show an excellent catalytic performance in the oxidative dehydrogenation of n-butene.…”