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Vapor synthesis of titania powder by titanium tetrachloride oxidation
Author(s) -
Akhtar M. Kamal,
Xiong Yun,
Pratsinis Sotiris E.
Publication year - 1991
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690371013
Subject(s) - titanium tetrachloride , geometric standard deviation , anatase , particle size , particle size distribution , rutile , scanning electron microscope , residence time (fluid dynamics) , particle (ecology) , materials science , scanning mobility particle sizer , analytical chemistry (journal) , phase (matter) , aerosol , titanium , chemistry , chemical engineering , chromatography , metallurgy , organic chemistry , composite material , oceanography , geotechnical engineering , photocatalysis , engineering , geology , catalysis
Formation of titania particles by vapor‐phase oxidation of titanium tetrachloride was studied in an aerosol reactor between 1,200 and 1,723 K. The effect of process variables (reactor residence time, temperature, and reactant concentration) on powder size and phase characteristic was investigated using the differential mobility particle sizer, scanning electron microscopy, and X‐ray diffraction. Titania particles were primarily anatase though the rutile weight fraction increased with increasing reactor temperature. The geometric number average diameter of the particles was between 0.13 and 0.35 μm, and the geometric standard deviation of the particle size distribution was about 1.4. The average particle size increased with increasing temperature, inlet TiCl 4 concentration, and residence time. The observed changes in the particle size distribution were compared with those predicted by solving the aerosol dynamic equation by a sectional method and accounting for coagulation and first‐order chemical reaction. While variations in the process variables resulted in discernible changes in the size of the particles, the spread of the distribution remained rather unaffected.