期刊
FUEL
卷 288, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119633
关键词
La promoter; Oxygen vacancy; Formate; Zn-Cr; Isobutanol; Syngas
资金
- Innovation Fund of Shanxi Institute of Coal Chemistry, CAS
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2019-KF-05]
- Key Research Program of Shanxi Province [201903D111010]
Doping lanthanum into ZnCr oxide created a novel catalyst structure, enhancing oxygen vacancy formation and promoting CO activation. In addition, the generated formate intermediate on the ZnCrLax surface improved catalytic activity, leading to increased isobutanol yield.
A series of catalysts were designed and synthesized via doping lanthanum into ZnCr oxide to realize efficient synthesis of isobutanol from syngas. By applying a combination of characterizations (XRD, TEM, EPR, XPS and in situ FT-IR) and DFT calculations, the effects of lanthanum promoter on catalyst structure and catalytic performance were investigated. With the doping of lanthanum, ZnCrLax composite oxides with a novel catalyst structure were constructed, in which Zn atom at tetrahedron site was partly substituted by doping La atom. The presence of this structure enhanced the formation of more oxygen vacancy sites and further benefitted the CO activation. In addition, formate intermediate was easier to generate and exhibited superior stability over ZnCrLax surface thus leaded to remarkably promoted catalytic activity. The ZnCrLa0.05 catalyst achieved optimum total alcohols selectivity of 61%, and the fraction of isobutanol reached as high as 24.6% under CO conversion of 23%.
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