Acid - base properties of binary oxide catalysts of alumina - rare earth oxides

Abstract

<span style="font-size:12.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-ansi-language:="" en-in;mso-fareast-language:en-in;mso-bidi-language:ar-sa"="" lang="EN-IN">Binary oxides of aluminium with rare earths like Pr, Nd, Sm and Eu have been prepared by coprecipitation using NH₃ from corresponding nitrates. Surface characteristics and acid-base properties have been determined by DTA, SEM, ESCA, MAS²⁷ AINMR, IR and titrimetric methods. Electronegativity of the rare earth oxide influences the acidity and basicity of the binary oxide. Both BrÖnsted and Lewis acid sites are observed on catalyst surface. Higher number of Lewis acid sites are observed on AI₂O₃-Nd₂O₃ surface.</span>