Influence of the zirconium precursor on the acidic and catalytic properties of sulfated zirconia catalysts prepared by sol-gel process

摘要

Sulfated zirconia catalysts were prepared using the sol-gel process. Hydrolysis water was produced in situ. The effects of the zirconium precursor on the physicochemical properties and the acidity of the solids have been investigated. The prepared catalysts were characterized by XRD, Raman spectroscopy, XPS, FTIR of adsorbed pyridine, physisorption of N-2 at 77 K, and TPR-H-2-MS. Pt-promoted catalysts were tested for n-hexane isomerization reaction and the influence of Pt amount on the stability was studied. Obtained solids exhibit low specific surface areas and narrow pore size distributions. In addition, the metastable tetragonal phase of ZrO2 was stabilized at a relatively high temperature. The acidity of catalysts prepared from different zirconium alkoxides and the magnitude of interaction between zirconia and sulfate species are compared and discussed.