Chlorination of titanias modified by alkali and/or phosphorus additives. II1 1 For Part I see Ref. 15.. Fractional orders with respect to the solids of uniform and non-uniform particle sizes

G. Mink, I. S. Pap, I. Bertóti, T. Székely, E. Karmazsin

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Abstract

The role of surface alkali and phosphorus additives on the time-dependence of the reaction of TiO2 with COCl2 has been studied by a reactive thermogravimetric method. At conversions below 0.7 apparent fractional orders with respect to the solid were found to be 1 (for TiO2-Li(s) and TiO2-Na(s)) and 2 (for TiO2-K(s)); these formal orders, however, provided insufficient information for describing the conversion vs. time curves above α = 0.7. The proposed kinetic model which enables satisfactory curve fitting even for high conversions involves a non-uniform particle size distribution, together with the surface enrichment of phosphorus as retardant during the shrinking of the particles, which results in a steady decrease in the linear reaction rate.

Original languageEnglish
Pages (from-to)335-348
Number of pages14
JournalReactivity of Solids
Volume6
Issue number4
DOIs
Publication statusPublished - 1989

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chlorination
Chlorination
Alkalies
Phosphorus
phosphorus
alkalies
Particle size
retardants
Curve fitting
Particle size analysis
Reaction rates
curve fitting
particle size distribution
Kinetics
time dependence
reaction kinetics
kinetics
curves

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title = "Chlorination of titanias modified by alkali and/or phosphorus additives. II1 1 For Part I see Ref. 15.. Fractional orders with respect to the solids of uniform and non-uniform particle sizes",
abstract = "The role of surface alkali and phosphorus additives on the time-dependence of the reaction of TiO2 with COCl2 has been studied by a reactive thermogravimetric method. At conversions below 0.7 apparent fractional orders with respect to the solid were found to be 1 (for TiO2-Li(s) and TiO2-Na(s)) and 2 (for TiO2-K(s)); these formal orders, however, provided insufficient information for describing the conversion vs. time curves above α = 0.7. The proposed kinetic model which enables satisfactory curve fitting even for high conversions involves a non-uniform particle size distribution, together with the surface enrichment of phosphorus as retardant during the shrinking of the particles, which results in a steady decrease in the linear reaction rate.",
author = "G. Mink and Pap, {I. S.} and I. Bert{\'o}ti and T. Sz{\'e}kely and E. Karmazsin",
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T1 - Chlorination of titanias modified by alkali and/or phosphorus additives. II1 1 For Part I see Ref. 15.. Fractional orders with respect to the solids of uniform and non-uniform particle sizes

AU - Mink, G.

AU - Pap, I. S.

AU - Bertóti, I.

AU - Székely, T.

AU - Karmazsin, E.

PY - 1989

Y1 - 1989

N2 - The role of surface alkali and phosphorus additives on the time-dependence of the reaction of TiO2 with COCl2 has been studied by a reactive thermogravimetric method. At conversions below 0.7 apparent fractional orders with respect to the solid were found to be 1 (for TiO2-Li(s) and TiO2-Na(s)) and 2 (for TiO2-K(s)); these formal orders, however, provided insufficient information for describing the conversion vs. time curves above α = 0.7. The proposed kinetic model which enables satisfactory curve fitting even for high conversions involves a non-uniform particle size distribution, together with the surface enrichment of phosphorus as retardant during the shrinking of the particles, which results in a steady decrease in the linear reaction rate.

AB - The role of surface alkali and phosphorus additives on the time-dependence of the reaction of TiO2 with COCl2 has been studied by a reactive thermogravimetric method. At conversions below 0.7 apparent fractional orders with respect to the solid were found to be 1 (for TiO2-Li(s) and TiO2-Na(s)) and 2 (for TiO2-K(s)); these formal orders, however, provided insufficient information for describing the conversion vs. time curves above α = 0.7. The proposed kinetic model which enables satisfactory curve fitting even for high conversions involves a non-uniform particle size distribution, together with the surface enrichment of phosphorus as retardant during the shrinking of the particles, which results in a steady decrease in the linear reaction rate.

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