Abstract
The aim of this work was to determine the nature and the strength of surface acid sites present on boron alumina surface. From the results obtained by FTIR of CO adsorbed at −135 °C, it can be concluded that the boron alumina has a Brönsted acidity due to the OH groups. These Brönsted acid sites are stronger than those of γ-alumina but in much smaller quantities due to its lower specific surface area. Similarly, it is noted that the boron alumina exhibits a single OH type with a single band around 3701 cm−1. This band represents a single configuration of OH species linked to boron and this species is disturbed by the adsorption of the CO probe molecule whereas on alumina we notice the presence of four OH species linked to aluminum. Only one of which is disturbed by the adsorption of CO with a decrease in the intensity of this band and the increase in the intensity of a band present at lower frequency.
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