Author/Authors :
Hongmanee، Goond نويسنده School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan , , Chammingkwan، Patchanee نويسنده School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan , , Taniike، Toshiaki نويسنده School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan , , Terano، Minoru نويسنده ,
Abstract :
Mg(OEt)2 with spherical morphology is one of the most important precursors for the preparation of industrial
Ziegler-Natta catalysts. In the present article, morphology evolution of Mg(OEt)2 particles is studied in the course
of the synthesis. The morphology of Mg(OEt)2 particles is observed throughout the process by SEM. The results
show that Mg(OEt)2 particles are formed through i) seed generation on Mg surfaces, ii) seed growth and isolation
as independent particles, and iii) further growth and shaping into smoother and more spherical particles. The size
of Mg sources greatly affects the rates of these processes to different extents. A larger size of Mg leads to slower
seed formation and growth, and detachment of clustered seeds, making the final particles larger and less spherical,
respectively. The crystal growth of Mg(OEt)2 is also affected by the size of Mg sources, which in turn differentiates
the pore size distribution to affect the catalyst composition and performance.
