Thermal Analysis of Coal-Bearing Strata Kaolinite/potassium Acetate Intercalation Complex

Abstract:

The thermal decomposition of coal-bearing strata kaolinite-potassium acetate(CK/KAc) intercalation complex has been studied using X-ray diffraction (XRD), thermogravimetry and differential thermogravimetric (TG-DTG) and infrared emission spectroscopy (IES). The XRD results show that the KAc has been successfully intercalated into coal-bearing strata kaolinite with an obvious basal distance increase of the first basal peak. The TG results show that the thermal decomposition of the intercalation complex occurs in four main steps (a) the loss of adsorbed water (b) the loss of coordination water (c) the loss of potassium acetate and (d) water through dehydroxylation. The IES of CK/KAc give the evidence on the changes of structure. These make all explanation have the sufficient evidence.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 2077-2081
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.2077
• Online since: June 2012
• Authors: Xiang Yao, Shuai Zhang, Bo Sun
• Keywords: Coal-Bearing Strata Kaolinite, Intercalation Complex, Potassium Acetate, Thermal Analysis

References

[1] Q. Liu, D.A. Spears, Q. Liu, MAS NMR study of surface-modified calcined kaolin, Appl. Clay Sci., 19 (2001) 89-94.

DOI: 10.1016/s0169-1317(01)00057-6

[2] H. Cheng, J. Yang, Q. Liu, J. Zhang, R.L. Frost, A spectroscopic comparison of selected Chinese kaolinite, coal bearing kaolinite and halloysite--A mid-infrared and near-infrared study, Spectrochim. Acta A:Mol. Biomol. Spectrosc., 77 (2010) 856-861.

DOI: 10.1016/j.saa.2010.08.018

[3] H. Cheng, Q. Liu, J. Yang, R.L. Frost, Thermogravimetric analysis of selected coal-bearing strata kaolinite, Thermochim. Acta, 507-508 (2010) 84-90.

DOI: 10.1016/j.tca.2010.05.004

[4] R.L. Frost, E. Horváth, É. Makó, J. Kristóf, Modification of low- and high-defect kaolinite surfaces: implications for kaolinite mineral processing, J. Colloid Interface Sci., 270 (2004) 337-346.

DOI: 10.1016/j.jcis.2003.10.034

[5] F. Franco, L.A. Pérez-Maqueda, J.L. Pérez-Rodríguez, The effect of ultrasound on the particle size and structural disorder of a well-ordered kaolinite, J. Colloid Interface Sci., 274 (2004) 107-117.

DOI: 10.1016/j.jcis.2003.12.003

[6] R.L. Frost, E. Horváth, É. Makó, J. Kristóf, T. Cseh, The effect of mechanochemical activation upon the intercalation of a high-defect kaolinite with formamide, J. Colloid Interface Sci., 265 (2003) 386-395.

DOI: 10.1016/s0021-9797(03)00452-1

[7] H. Cheng, Q. Liu, J. Zhang, J. Yang, R.L. Frost, Delamination of kaolinite-potassium acetate intercalates by ball-milling, J. Colloid Interface Sci., 348 (2010) 355-359.

DOI: 10.1016/j.jcis.2010.05.006

[8] H. Cheng, Q. Liu, J. Yang, J. Zhang, R.L. Frost, X. Du, Infrared spectroscopic study of halloysite-potassium acetate intercalation complex, J. Mol. Struct., 990 (2011) 21-25.

DOI: 10.1016/j.molstruc.2011.01.008

[9] H. Cheng, Q. Liu, J. Yang, J. Zhang, R.L. Frost, Thermal analysis and infrared emission spectroscopic study of halloysite-potassium acetate intercalation compound, Thermochim. Acta, 511 (2010) 124-128.

DOI: 10.1016/j.tca.2010.08.003

[10] C.E. White, J.L. Provis, L.E. Gordon, D.P. Riley, T. Proffen, J.S.J. van Deventer, Effect of Temperature on the Local Structure of Kaolinite Intercalated with Potassium Acetate, Chem. Mater., 23 (2010) 188-199.

DOI: 10.1021/cm102648n

[11] R.L. Frost, J. Kristof, G.N. Paroz, J.T. Kloprogge, Role of Water in the Intercalation of Kaolinite with Hydrazine, J. Colloid Interface Sci., 208 (1998) 216-225.

DOI: 10.1006/jcis.1998.5780

[12] H. Cheng, Q. Liu, X. Cui, Q. Zhang, Z. Zhang, R.L. Frost, Mechanism of dehydroxylation temperature decrease and high temperature phase transition of coal-bearing strata kaolinite intercalated by potassium acetate, J. Colloid Interface Sci., 376 (2012) 47-56.

DOI: 10.1016/j.jcis.2012.02.065