کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
55164 | 47042 | 2012 | 7 صفحه PDF | دانلود رایگان |
The development of Brønsted acidity and the relationship between acidity, catalytic performance and structure of niobium oxide were investigated for a series of samples prepared by calcination of niobic acid at temperatures between 423 and 823 K. All solids were active for propan-2-ol dehydration. The Brønsted acidity was monitored by adsorption of lutidine and CO followed by FT-IR. Low temperature CO adsorption measurements showed that all solids exhibit essentially the same medium Brønsted acid strength. A direct relationship between the abundance of Brønsted acid sites monitored by lutidine adsorption followed by desorption at 523 K and propan-2-ol dehydration activity was observed.
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► Catalysts: niobic acid calcined at different temperatures.
► Acid catalyzed reaction test: propanol dehydration activity.
► Brønsted acidity as a function of the calcination temperature.
► All solids exhibit similar medium Brønsted acid strength.
► Direct relationship between the abundance of Brønsted acid sites and activity.
Journal: Catalysis Today - Volume 192, Issue 1, 30 September 2012, Pages 123–129