Boria modified alumina probed by methanol dehydration and IR spectroscopy

Al2O3 B2O3 catalysts were synthesized by co-precipitation and impregnation methods applying two calcination temperatures and boria loadings. Catalysts were analyzed by IR spectroscopy of pyridine and CO2 adsorption and were evaluated in methanol dehydration. Results showed that boron addition to alumina causes a decrease of the number of basic and Lewis acid sites on alumina surface. It could also be observed an enhancement in acid strength of Lewis sites for impregnated samples. The results of methanol dehydration show that strong Bro¨nsted sites are not formed on borate alumina. # 2003 Elsevier B.V. All rights reserved