摘要
Ternary multifunctional A<sub>1</sub>Zn<sub>y</sub>Zr<sub>z</sub>O<sub>n</sub> catalysts are prepared by introducing A-site transition metals with the redox capability into binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub>. Structure and morphology were investigated by means of XRD, BET and FESEM, respectively. Activity data showed that Cr addition exhibited obvious beneficial effect to promote isobutene production from direct conversion of bio-ethanol compared to other A-site metal dopants. A significant higher yield of isobutene over Cr-promoted Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> catalyst was also observed with respect to its binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> counterpart. The choice of A-site metal is of prime importance in the isobutene production, catalyzing mainly the ethanol dehydrogenation, meanwhile the appropriate addition of zinc on the catalyst surface is also essential for good isobutene yield.
Ternary multifunctional A<sub>1</sub>Zn<sub>y</sub>Zr<sub>z</sub>O<sub>n</sub> catalysts are prepared by introducing A-site transition metals with the redox capability into binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub>. Structure and morphology were investigated by means of XRD, BET and FESEM, respectively. Activity data showed that Cr addition exhibited obvious beneficial effect to promote isobutene production from direct conversion of bio-ethanol compared to other A-site metal dopants. A significant higher yield of isobutene over Cr-promoted Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> catalyst was also observed with respect to its binary Zn<sub>1</sub>Zr<sub>8</sub>O<sub>n</sub> counterpart. The choice of A-site metal is of prime importance in the isobutene production, catalyzing mainly the ethanol dehydrogenation, meanwhile the appropriate addition of zinc on the catalyst surface is also essential for good isobutene yield.
