1,3-Butadiene, a major feedstock for synthetic rubber, can be obtained from two processes. One is the cracking and separation of light component in petroleum. Another is the oxidative dehydrogenation (ODH) of butenes. ZnFe2O4 and Co9Fe3Bi1Mo12O51 are deemed as effective catalysts for the latter one, among which Co9Fe3Bi1Mo12O51 exhibits higher reactivity in ODH of 1-butene while ZnFe2O4 in ODH of 2-butene. A synergistic effect by packing above two catalysts with certain sequence was achieved and it can improve the total yield of 1,3-butadiene from mixed-butenes. In this regard, to fabricate these two catalysts into one with ordered structure can be expected to be more efficient in ODH of butenes. In this work, a core-shell structured catalyst (referred as Co9Fe3Bi1Mo12O51 @C@ ZnFe2O4) were successfully synthesized and investigated in ODH reaction, as shown in the figure below. Carbon material was employed as intermediate in order to enlarge the specific surface area of exterior metal oxide. The results demonstrate that the yield of 1-butene over Co9Fe3Bi1Mo12O51 increase from 73% to 78% with one layer carbon coating, while that of over Co9Fe3Bi1Mo12O51 @C@ ZnFe2O4 from 70% to 72% comparing with ZnFe2O4. With carbon intermediate involved, the better catalytic performance can be obtained and the synergistic effect was also proved with mixed-butenes.
* Corresponding author. Tel.: +86 571 8795 2728, Fax: +86 571 8795 1227
E-mail address: firstname.lastname@example.org (F.Q. Chen)