کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
55174 | 47042 | 2012 | 8 صفحه PDF | دانلود رایگان |
An alumina-supported tantalum oxide (Ta2O5/Al2O3) calcined at 1223 K promoted both Friedel–Crafts alkylation of anisole with benzyl alcohol and isomerization of α-pinene, and exhibited Brønsted acidity despite the high temperature calcination. Among the Ta2O5/Al2O3 catalysts tested, 33 wt% Ta2O5/Al2O3 calcined at 1223 K showed the highest activity. A monolayer of tantalum acid-like compound, which has distorted octahedral symmetry, was stabilized over 33 wt% Ta2O5/Al2O3 catalyst calcined at 1223 K. The two-dimensional Ta–O–Ta network of stabilized tantalum acid-like compound probably accounts for the generation of Brønsted acid.
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► Generation of acid sites on Ta2O5/Al2O3 calcined at high temperature.
► Ta2O5/Al2O3 showed catalytic activity for Friedel–Crafts alkylation and α-pinene isomerization.
► A monolayer of tantalum acid-like compound was stabilized.
► The two-dimensional Ta–O–Ta network probably accounts for the generation of Brønsted acid.
Journal: Catalysis Today - Volume 192, Issue 1, 30 September 2012, Pages 189–196