Thermal decomposition of the synthetic hydrotalcite iowaite

被引：31

作者：

Frost, R. L. ^{[1
]}

Bouzaid, J. M. ^{[1
]}

Musumeci, A. W. ^{[1
]}

Kloprogge, J. T. ^{[1
]}

Martens, W. N. ^{[1
]}

机构：

[1] Queensland Univ Technol, Inorgan Mat Res Program, Sch Phys & Chem Sci, Brisbane, Qld 4001, Australia

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2006年 / 86卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

dehydration; dehydroxylation; high-resolution thermogravimetric analysis; hydrotalcite; iowaite;

D O I：

10.1007/s10973-005-7290-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The thermal stability and thermal decomposition pathways for synthetic iowaite have been determined using thermogravimetry in conjunction with evolved gas mass spectrometry. Chemical analysis showed the formula of the synthesised iowaite to be Mg6.27Fe1.73(Cl)(1.07)(OH)(16)(CO3)(0.33)6.1H(2)O and X-ray diffraction confirms the layered structure. Dehydration of the iowaite occurred at 35 and 79 degrees C. Dehydroxylation occurred at 254 and 291 degrees C. Both steps were associated with the loss of CO2. Hydrogen chloride gas was evolved in two steps at 368 and 434 degrees C. The products of the thermal decomposition were MgO and a spinel MgFe2O4. Experimentally it was found to be difficult to eliminate CO2 from inclusion in the interlayer during the synthesis of the iowaite compound and in this way the synthesised iowaite resembled the natural mineral.

引用

页码：437 / 441

页数：5

共 19 条

[1] Cu/Ni/Al layered double hydroxides as precursors of catalysts for the wet air oxidation of phenol aqueous solutions [J].

Alejandre, A ;

Medina, F ;

Rodriguez, X ;

Salagre, P ;

Cesteros, Y ;

Sueiras, JE .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2001, 30 (1-2) :195-207

[2]

ALLMANN R, 1969, AM MINERAL, V54, P296

[3] Catalytic ketonization of acetic acid on Zn/Al layered double hydroxides [J].

Das, J ;

Parida, K .

REACTION KINETICS AND CATALYSIS LETTERS, 2000, 69 (02) :223-229

[4] Thermal treatment of whewellite - a thermal analysis and Raman spectroscopic study [J].

Frost, RL ;

Weier, ML .

THERMOCHIMICA ACTA, 2004, 409 (01) :79-85

[5] Raman spectroscopy of synthetic and natural iowaite [J].

Frost, RL ;

Adebajo, MO ;

Erickson, KL .

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 2005, 61 (04) :613-620

[6] Near-infrared spectroscopy of stitchtite, iowaite, desautelsite and arsenate exchanged takovite and hydrotalcite [J].

Frost, RL ;

Erickson, KL .

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 2005, 61 (1-2) :51-56

[7]

Frost RL, 2004, J THERM ANAL CALORIM, V78, P367, DOI 10.1023/B:JTAN.0000046103.00586.61

[8] Vibrational spectroscopy of stichtite [J].

Frost, RL ;

Erickson, KL .

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 2004, 60 (13) :3001-3005

[9]

Frost RL, 2004, J THERM ANAL CALORIM, V76, P1025, DOI 10.1023/B:JTAN.0000032287.08535.b3

[10] Thermal decomposition of synthetic hydrotalcites reevesite and pyroaurite [J].

Frost, RL ;

Erickson, KL .

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2004, 76 (01) :217-225

← 1 2 →