Kinetics of pyrohydrolysis of (NH4)(2)TiF6 and (NH4)(2)TiOF4

Authors
Maslennikova, IG Laptash, NM Golikov, AP
Citation
Ig. Maslennikova et al., Kinetics of pyrohydrolysis of (NH4)(2)TiF6 and (NH4)(2)TiOF4, RUSS J IN C, 46(2), 2001, pp. 186-191
Citations number
15
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
ISSN journal
00360236 → ACNP
Volume
46
Issue
2
Year of publication
2001
Pages
186 - 191
Database
ISI
SICI code
0036-0236(200102)46:2<186:KOPO(A>2.0.ZU;2-6
Abstract
The kinetics of isothermal pyrohydrolysis of (NH4)(2)TiF6 (I) were studied in comparison to (NH4)(2)TiOF4 (II) over the range of 200-400 degreesC. Che mical analysis, X-ray powder diffraction, and IR spectroscopy were used to show that in both cases the process involves ammonium oxofluorotitanate int ermediates. In the case of compound II, the initial stage of the process is complicated by the thermal dissociation of the initial complex to produce (NH4)(2)TiF6 and NH4TiOF3. The process rates for the temperatures studied w ere calculated. The apparent activation energy of pyrohydrolysis for I and II is 57.36 and 48.08 kJ/mol, respectively.