Chlorination Kinetics of ZnFe<SUB>2</SUB>O<SUB>4</SUB> with Ar-Cl<SUB>2</SUB>-O<SUB>2</SUB> Gas
-
- Matsuura Hiroyuki
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo
-
- Hamano Tasuku
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo
-
- Tsukihashi Fumitaka
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo
Bibliographic Information
- Other Title
-
- Chlorination Kinetics of ZnFe2O4 with Ar-Cl2-O2 Gas
Search this article
Abstract
Chlorination rate of ZnFe2O4 with Ar-Cl2-O2 gas was measured at 1023 to 1123 K by gravimetry. The effects of temperature, partial pressures of chlorine and oxygen on the rate were investigated. Zinc oxide contained in ZnFe2O4 specimen was selectively chlorinated and evaporated in gas, while iron oxide remained as oxide in a chlorinated residue. Chlorination rate increased with increasing partial pressure of chlorine. On the other hand, chlorination rate slightly decreased with increasing partial pressure of oxygen and chlorination of iron oxide was prevented. Since the order of chlorination rate with respect to partial pressure of chlorine was approximately 0.5, the rate-determining step of chlorination is considered to be the dissociative adsorption of chlorine gas on the surface of solid ZnFe2O4. Decrease of chlorination rate with the increase of partial pressure of oxygen could be explained by the occupation of adsorption sites of chlorine atoms by oxygen and the chlorination rate was expressed as functions of partial pressures of chlorine and oxygen as r=k·(P_Cl2^1/2/1+K_OP_O2^1/2) The activation energy of chlorination was 35.1±2.2 kJ/mol which is relatively small compared to that of ZnO chlorination reaction (58.2 kJ/mol). It is considered that this low activation energy is due to the weak adsorption of chlorine atom on the adsorption site.
Journal
-
- MATERIALS TRANSACTIONS
-
MATERIALS TRANSACTIONS 47 (10), 2524-2532, 2006
The Japan Institute of Metals and Materials
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390001204250672640
-
- NII Article ID
- 10018310304
-
- NII Book ID
- AA1151294X
-
- ISSN
- 13475320
- 13459678
-
- NDL BIB ID
- 8092107
-
- Text Lang
- en
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed