Zirconia-phosphate aerogels were prepared by two methods: a one-step s
ol-gel synthesis followed by supercritical drying and an incipient wet
ness impregnation synthesis of a calcined zirconia aerogel. These samp
les were characterized by nitrogen adsorption, X-ray diffraction, infr
ared spectroscopy, and 1-butene isomerization. We identified both the
conditions when zirconia-phosphate aerogels possess Bronsted acid site
s, and the phosphate species responsible for their generation.