Abstract
Ternary multifunctional A1ZnyZrzOn catalysts are prepared by introducing A-site transition metals with the redox capability into binary Zn1Zr8On. 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 Zn1Zr8On catalyst was also observed with respect to its binary Zn1Zr8On 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.
Highlights
Conversions from sustainable biomass-based raw materials to valuable fuels and chemicals have drawn intensive interest to meet grand challenges in global warming and depletion of fossil feedstocks [1] [2]
Bio-ethanol conversion to lighter olefins has become a strategic reaction for the production of highly valuable chemicals
Different A-site metals such as Fe, Cr, and Ni were introduced into binary Zn1Zr8On forming ternary A1Zn1Zr8Oncomposite catalysts, aiming to enhance the catalytic activity for ethanol to isobutene (ETIB) reaction
Summary
Conversions from sustainable biomass-based raw materials to valuable fuels and chemicals have drawn intensive interest to meet grand challenges in global warming and depletion of fossil feedstocks [1] [2]. Bio-ethanol conversion to lighter olefins has become a strategic reaction for the production of highly valuable chemicals. Wang and co-workers reported the first evidence of direct conversion of bio-ethanol to isobutene (ETIB) over ZnxZryOz mixed oxide catalyst [10]. They rationalized that the balanced acid-base sites of ZnxZryOz were responsible for the direct and high-yield conversion of ETIB. Different A-site metals such as Fe, Cr, and Ni were introduced into binary Zn1Zr8On forming ternary A1Zn1Zr8Oncomposite catalysts, aiming to enhance the catalytic activity for ETIB reaction. The contents of zinc and zirconium species were found to be essential for the isobutene production over ternary Cr1ZnyZrzOn
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