Composite ferrite catalyst for ethylbenzene dehydrogenation: Enhancement of potassium stability and catalytic performance by phase selective doping

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• 作者：Andrzej  ; Kotarba  ; ;   ; ^{kotarba@chemia.uj.edu.pl} ; Weronika  ; Bieniasz ; Piotr  ; Ku?trowski ; Katarzyna  ; Stadnicka ; Zbigniew  ; Sojka
• 关键词：Styrene catalyst ; Potassium ferrites ; Potassium loss ; KFeO₂ ; K₂Fe₂₂O₃₄ ; Stability ; Iron oxide ; Ethylbenzene dehydrogenation ; EBDH
• 刊名：Applied Catalysis A: General
• 出版年：2011
• 出版时间：4 November 2011
• 年：2011
• 卷：407
• 期：1-2
• 页码：100-105
• 全文大小：709 K

文摘

Composite ferrite catalyst consisting of pristine irregular KFeO₂ crystallites and well developed hexagonal nanoplates of selectively doped (2 % Ce,2 % Cr)-K₂Fe₂₂O₃₄ was prepared, characterized (XRD, HR-TEM, SEM-EDX, BET) and tested for potassium volatilization and catalytic performance in ethylbenzene dehydrogenation. In comparison with separate parent ferrite phases the obtained composite catalyst exhibited superior overall catalytic performance (stability and activity), combining the best features of its components. Indeed, it exhibits the conversion and selectivity to styrene monomer of the most active phase of 2 % Ce, 2 % Cr-doped K₂Fe₂₂O₃₄, whereas the thermal stability of potassium was even higher than in the most stable KFeO₂ phase.