The effect of the surface hydroxyls on the chlorination kinetics of alumina

I. S. Pap, G. Mink, I. Bertóti, B. Zelei, T. Székely, T. Hauthal, G. Blumenthal, G. Kranz

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The chlorination kinetics of alumina samples containing various amounts of surface hydroxyls were studied by thermogravimetry. The phase composition and the specific surface area of the reacting solids were characterized by X-ray diffraction (XRD), IR and BET methods. At temperatures where the reaction rate was controlled by the chemical process the highest initial reaction rates were observed on the partially dehydroxylated samples prepared from gibbsite at 670 K. The high reactivity towards phosgene was attributed to the special role of the surface hydroxyls in the chlorination process. At high conversions, however, a significant decrease in the reaction rate was observed; this can be explained by the consumption of amorphous and transition alumina phases which leaves behind less reactive boehmite of much lower specific surface area.

Original languageEnglish
Pages (from-to)205-213
Number of pages9
JournalThermochimica Acta
Volume149
Issue numberC
DOIs
Publication statusPublished - Sep 10 1989

Fingerprint

chlorination
Aluminum Oxide
Chlorination
Hydroxyl Radical
Reaction rates
Alumina
aluminum oxides
Specific surface area
reaction kinetics
Kinetics
kinetics
Phosgene
phosgene
Phase composition
Thermogravimetric analysis
thermogravimetry
leaves
X ray diffraction
reactivity
diffraction

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry

Cite this

Pap, I. S., Mink, G., Bertóti, I., Zelei, B., Székely, T., Hauthal, T., ... Kranz, G. (1989). The effect of the surface hydroxyls on the chlorination kinetics of alumina. Thermochimica Acta, 149(C), 205-213. https://doi.org/10.1016/0040-6031(89)85282-7

The effect of the surface hydroxyls on the chlorination kinetics of alumina. / Pap, I. S.; Mink, G.; Bertóti, I.; Zelei, B.; Székely, T.; Hauthal, T.; Blumenthal, G.; Kranz, G.

In: Thermochimica Acta, Vol. 149, No. C, 10.09.1989, p. 205-213.

Research output: Contribution to journalArticle

Pap, IS, Mink, G, Bertóti, I, Zelei, B, Székely, T, Hauthal, T, Blumenthal, G & Kranz, G 1989, 'The effect of the surface hydroxyls on the chlorination kinetics of alumina', Thermochimica Acta, vol. 149, no. C, pp. 205-213. https://doi.org/10.1016/0040-6031(89)85282-7
Pap, I. S. ; Mink, G. ; Bertóti, I. ; Zelei, B. ; Székely, T. ; Hauthal, T. ; Blumenthal, G. ; Kranz, G. / The effect of the surface hydroxyls on the chlorination kinetics of alumina. In: Thermochimica Acta. 1989 ; Vol. 149, No. C. pp. 205-213.
@article{480e8bebd8624301a63c39da5569dfd5,
title = "The effect of the surface hydroxyls on the chlorination kinetics of alumina",
abstract = "The chlorination kinetics of alumina samples containing various amounts of surface hydroxyls were studied by thermogravimetry. The phase composition and the specific surface area of the reacting solids were characterized by X-ray diffraction (XRD), IR and BET methods. At temperatures where the reaction rate was controlled by the chemical process the highest initial reaction rates were observed on the partially dehydroxylated samples prepared from gibbsite at 670 K. The high reactivity towards phosgene was attributed to the special role of the surface hydroxyls in the chlorination process. At high conversions, however, a significant decrease in the reaction rate was observed; this can be explained by the consumption of amorphous and transition alumina phases which leaves behind less reactive boehmite of much lower specific surface area.",
author = "Pap, {I. S.} and G. Mink and I. Bert{\'o}ti and B. Zelei and T. Sz{\'e}kely and T. Hauthal and G. Blumenthal and G. Kranz",
year = "1989",
month = "9",
day = "10",
doi = "10.1016/0040-6031(89)85282-7",
language = "English",
volume = "149",
pages = "205--213",
journal = "Thermochimica Acta",
issn = "0040-6031",
publisher = "Elsevier",
number = "C",

}

TY - JOUR

T1 - The effect of the surface hydroxyls on the chlorination kinetics of alumina

AU - Pap, I. S.

AU - Mink, G.

AU - Bertóti, I.

AU - Zelei, B.

AU - Székely, T.

AU - Hauthal, T.

AU - Blumenthal, G.

AU - Kranz, G.

PY - 1989/9/10

Y1 - 1989/9/10

N2 - The chlorination kinetics of alumina samples containing various amounts of surface hydroxyls were studied by thermogravimetry. The phase composition and the specific surface area of the reacting solids were characterized by X-ray diffraction (XRD), IR and BET methods. At temperatures where the reaction rate was controlled by the chemical process the highest initial reaction rates were observed on the partially dehydroxylated samples prepared from gibbsite at 670 K. The high reactivity towards phosgene was attributed to the special role of the surface hydroxyls in the chlorination process. At high conversions, however, a significant decrease in the reaction rate was observed; this can be explained by the consumption of amorphous and transition alumina phases which leaves behind less reactive boehmite of much lower specific surface area.

AB - The chlorination kinetics of alumina samples containing various amounts of surface hydroxyls were studied by thermogravimetry. The phase composition and the specific surface area of the reacting solids were characterized by X-ray diffraction (XRD), IR and BET methods. At temperatures where the reaction rate was controlled by the chemical process the highest initial reaction rates were observed on the partially dehydroxylated samples prepared from gibbsite at 670 K. The high reactivity towards phosgene was attributed to the special role of the surface hydroxyls in the chlorination process. At high conversions, however, a significant decrease in the reaction rate was observed; this can be explained by the consumption of amorphous and transition alumina phases which leaves behind less reactive boehmite of much lower specific surface area.

UR - http://www.scopus.com/inward/record.url?scp=26144461286&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=26144461286&partnerID=8YFLogxK

U2 - 10.1016/0040-6031(89)85282-7

DO - 10.1016/0040-6031(89)85282-7

M3 - Article

AN - SCOPUS:26144461286

VL - 149

SP - 205

EP - 213

JO - Thermochimica Acta

JF - Thermochimica Acta

SN - 0040-6031

IS - C

ER -