MECHANOCHEMICAL EFFECTS OF SOME RARE-EARTH ULTRAPHOSPHATES AND REFORMING OF THEIR SURFACE FOR CATALYTIC PROPERTIES

Abstract

Rare-earth ultraphosphates, RP5O14, were synthesized, and their mechanochemical effects due to grinding were investigated by using TG-DTA, XRD, FT-IR and SEM. When the ultraphosphates were ground, their XRD peaks became smaller, their particles were flocculated to be paste, and their P-O-P bondings were cleaved to form P-O-H bondings. The P-O-H bondings formed by mechanical treatment were expected to raise catalytic activities of rare-earth ultraphosphates. The ultraphosphates reformed by grinding enlarged the surface areas, the acid strength, amount of acidic sites, and the conversion of 2-propanol to propylene.