Reversible thermal behaviour of layered double hydroxides: A thermogravimetric study

被引:49
作者
Puttaswamy, NS [1 ]
Kamath, PV [1 ]
机构
[1] BANGALORE UNIV,CENT COLL,DEPT CHEM,BANGALORE 560001,KARNATAKA,INDIA
关键词
D O I
10.1039/a701911d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Layered double hydroxides (LDHs) of Mg with trivalent cations such as Al, Cr and Fe show two mass loss steps on heating; the low-temperature (25-250 degrees C) loss is due to dehydration and the high-temperature (250-450 degrees C) loss is due to decomposition. Both steps are reversible and the oxide residues obtained after calcination at 700 degrees C reconstruct back to the hydroxide phase. On the other hand the LDHs of Ca and Ni dehydrate reversibly but their decomposition reaction is irreversible. The LDHs of Zn and Co lose mass continuously up to 700 degrees C without any well resolved steps and the loss is irreversible. These results have implications on the synthesis of selective catalysts by calcination of LDHs.
引用
收藏
页码:1941 / 1945
页数:5
相关论文
共 19 条
[1]  
[Anonymous], POWD DIFFR FIL
[2]   [ZN2CR(OH)6]X.2H2O, NEW LAYER COMPOUNDS CAPABLE OF ANION-EXCHANGE AND INTRACRYSTALLINE SWELLING [J].
BOEHM, HP ;
STEINLE, J ;
VIEWEGER, C .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1977, 16 (04) :265-266
[3]   LAYERED DOUBLE HYDROXIDES (LDHS) [J].
CARRADO, KA ;
KOSTAPAPAS, A ;
SUIB, SL .
SOLID STATE IONICS, 1988, 26 (02) :77-86
[4]   HYDROTALCITE-TYPE ANIONIC CLAYS: PREPARATION, PROPERTIES AND APPLICATIONS [J].
Cavani, F. ;
Trifiro, F. ;
Vaccari, A. .
CATALYSIS TODAY, 1991, 11 (02) :173-301
[5]   BASIC PROPERTIES OF MG1-X(2+)ALX(3+) LAYERED DOUBLE HYDROXIDES INTERCALATED BY CARBONATE, HYDROXIDE CHLORIDE AND SULFATE ANIONS [J].
CONSTANTINO, VRL ;
PINNAVAIA, TJ .
INORGANIC CHEMISTRY, 1995, 34 (04) :883-892
[6]   STABILIZED ALPHA-NI(OH)2 AS ELECTRODE MATERIAL FOR ALKALINE SECONDARY CELLS [J].
KAMATH, PV ;
DIXIT, M ;
INDIRA, L ;
SHUKLA, AK ;
KUMAR, VG ;
MUNICHANDRAIAH, N .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1994, 141 (11) :2956-2959
[7]   SYNTHESIS AND PROPERTIES OF MG-ZN-AL-SO4 HYDROTALCITE-LIKE COMPOUNDS [J].
KOOLI, F ;
KOSUGE, K ;
HIBINO, T ;
TSUNASHIMA, A .
JOURNAL OF MATERIALS SCIENCE, 1993, 28 (10) :2769-2773
[8]  
MALKI KE, 1993, MAT RES B, V28, P667
[9]   SYNTHESES OF HYDROTALCITE-LIKE COMPOUNDS AND THEIR STRUCTURES AND PHYSICOCHEMICAL PROPERTIES .1. SYSTEMS MG2+-AL3+-NO-3,MG2+-AL3+-CL-,MG2+-AL3+-CLO-4,NI2P-AL3+-CL- AND ZN2+-AL3+-CL- [J].
MIYATA, S .
CLAYS AND CLAY MINERALS, 1975, 23 (05) :369-&
[10]   REALIZATION OF A HUMIDITY SENSOR [J].
MONEYRON, JE ;
DEROY, A ;
BESSE, JP .
SENSORS AND ACTUATORS B-CHEMICAL, 1991, 4 (1-2) :189-194