SYNTHESIS AND CATALYTIC ACTIVITY OF A POROUS Y-P-O COMPOSITE OXIDE

Abstract

A porous Y-P-O composite oxide (denoted as YPO-1) was synthesized using a precipitation method. Its surface area was 233 and 156 m²·g^-1 after evacuation at 400 and 600°C, respectively. YPO-1 was amorphous when calcined at 300°C, while it showed distinct diffraction lines of YPO₄ when calcined above 500°C. The acid strength of YPO-1, which was expressed by pKa of indicator, was≥+1.5. The specific catalytic activity per unit weight of YPO-1 for the isomerization of 1-butene increased with an increase in evacuation temperature, reached a maximum at 300°C, and then decreased.