Abstract
This study reports a novel strategy to obtain ultrafine metastable monoclinic molybdenum trioxide (β-MoO3) powder by the method of sublimation in the temperatures range of 1123–1373 K using the industrial grade MoO3 as raw material. The vapor-phase MoO3 could rapidly condensate and deposit in the bag filter after being quenched. It is found that the particle size has no obvious regularity with the sublimation temperature and the as-prepared β-MoO3 appears to be perfectly spherical. Impurities such as SiO2 in raw MoO3 samples have a significant retarding influence on the sublimation rate. Both the mechanisms of sublimation of industrial grade MoO3 as well as the nucleation and growth process of ultrafine β-MoO3 have been shed light. This work may have a guide role in the large-scale production of ultrafine spherical β-MoO3 catalyst.
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