Thermal analysis of Vitamin C affecting low-temperature oxidation of coal

Abstract

Simultaneous thermal analysis was used to study the influence of Vitamin C as possible chemical additive inhibiting coal oxidation process at low temperature. Some oxidation characteristics of Vitamin C affecting the coal oxidation were investigated at different heating rates. The TG-DSC data show that the impact of Vitamin C on coal oxidation process can be directly evaluated using ignition temperature and critical temperature. Comparison with the effect of water on coal oxidation shows that Vitamin C is more efficient than water. However, the blank experiment conducted with inert α-Al₂O₃ also suggests that Vitamin C can decompose at about 200 °C, which limits the usage of Vitamin C on inhibiting coal oxidation.

Keywords

thermal analysis / vitamin C / coal oxidation / inhibitor

References

[1] Wang H H, Dlugogorski B Z, Kennedy E M. Analysis of the Mechanism of the Low-temperature Oxidation of Coal[J]. Combust. Flame, 2003, 134: 107-117.

[2] Mao J D, Schimmelmann A, Mastalerz M, et al. Structural Features of a Bituminous Coal and Their Changes during Low-Temperature Oxidation and Loss of Volatiles Investigated by Advanced Solid-State NMR Spectroscopy[J]. Energ. Fuel, 2010, 24: 2536-2544.

[3] Wang H H, Dlugogorski B Z, Kennedy E M. Coal Oxidation at Low Temperatures: Oxygen Consumption Oxidation Products, Reaction Mechanism and Kinetic Modeling[J]. Prog. Energy Combust. Sci., 2003, 29: 487-513.

[4] Taraba B, Peter R, Slovak V. Calorimetric Investigation of Chemical Additives Affecting Oxidation of Coal at Low Temperatures[J]. Fuel Process. Technol., 2011, 92: 712-715.

[5] Watanabe W S, Zhang D K. The Effect of Inherent and Added Inorganic Matter on Low-temperature Oxidation Reaction of Coal[J]. Fuel Process. Technol., 2001, 74: 145-160.

[6] Sujanti W, Zhang D K. Investigation into the Role of Inherent Inorganic Matter and Additives in Low-Temperature Oxidation of a Victorian Brown Coal[J]. Combust. Sci. Technol., 2000, 152: 99-114.

[7] Dou G, Wang D, Zhong X, et al. Effectiveness of Catechin and Poly(ethyleneglycol) at Inhibiting the Spontaneous Combustion of Coal[J]. Fuel Process. Technol., 2014, 120: 123-127.

[8] Slovák V, Taraba B. Urea and CaCl₂ as Inhibitors of Coal Lowtemperature Oxidation[J]. J. Therm. Anal. Calorim., 2012, 110: 363-367.

[9] Singh A K, Sahay N, Ahmad I, et al. Role of Inorganic Com-pounds as Inhibitor in Diminishing Self-heating Phenomena of Indian Coal[J]. J. Mines Metals Fuels, 2002, 50: 356-359.

[10] Xu Y, Wang D, Wang L, et al. Experimental Research on Inibition Performances of the Sand-suspended Colloid for Coal Spontaneous Combustion[J]. Safety Sci., 2012, 50: 822-827.

[11] Zhan J, Wang H H, Song S N, et al. Role of an Additive in Retarding Coal Oxidation at Moderate Temperatures[J]. Proceed. Combust. Insti., 2011, 33: 2515-2522.

[12] Yu S, Xie F, Lu C, et al. Oxidation and Inhibition Characteristic of Coal with Different Deoxidization Degree[J]. J. China Coal Society, 2010, 35: 136-140.

[13] Englard S, Seifter S. The Biochemical Functions of Ascorbic Acid[J]. Annu. Rev. Nutr., 1986, 6: 365-406.

[14] Polidori M C, Mecocci P, Frei B. Plasma Vitamin C Levels are Decreased and Correlated with Brain Damage in Patients with Intracranial Hemorrhage or Head Trauma[J]. Stroke, 2001, 32: 898-902.

[15] Pospisil J, Klemchuk P P. Oxidation Inhibition in Organic Materials[M], 1990 Boca Raton: CRC Press.

[16] Wang D, Dou G, Zhong X, et al. An Experimental Approach to Selecting Chemical Inhibitors to Retard the Spontaneous Combustion of Coal[J]. Fuel, 2014, 117: 218-223.