Abstract
The effect of boron and fluorine modified γ-Al2O3 was investigated during ethanol dehydration to ethylene. The conventional and modified γ-Al2O3 were prepared by a sol–gel method and characterized by various techniques. The results showed that boron modified γ-Al2O3 possessed decreased amount of Lewis acid sites by increasing the boron content. Fluorine modified γ-Al2O3 created new Bronsted acid sites with increasing the fluorine content, which resulted in the coexistence of Bronsted and Lewis acid sites, at the same time, strong acid sites appeared. Boron modified γ-Al2O3 catalyst (Al-B1) at 340 °C exhibited excellent catalytic stability and good selectivity for ethanol conversion to ethylene. The improvement in the catalytic stability could be attributed to the lower acidity after boron modification. The results indicated that on γ-Al2O3 catalyst, strong acid sites especially Bronsted acid sites were responsible for coking deactivation and unfavorable to ethanol dehydration to ethylene.
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