Influence of Cu(NO3)2 Activator and Gas Composition on the Thermal Decomposition of Coal and Lignite

• Published in: Coke and chemistry (New York, N.Y.) Vol. 63; no. 3; pp. 114 - 119
• Main Authors: Larionov, K. B., Mishakov, I. V., Slyusarskiy, K. V., Lavrinenko, S. V., Gromov, A. A., Vedyagin, A. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-03-2020; Springer Nature B.V
• Subjects: Argon; Atmospheric composition; Chemistry; Chemistry and Materials Science; Coal; Copper; Gas composition; Industrial Chemistry/Chemical Engineering; Lignite; Mass spectrometry; Nitrogen oxides; Oxidation; Oxidizing agents; Thermal decomposition; Thermal transformations; Thermogravimetric analysis; mass-spectrometric analysis; gas composition; copper nitrate; activated oxidation; coal; lignite; thermogravimetric analysis; oxidation temperature
• ISSN: 1068-364X; 1934-8398
• DOI: 10.3103/S1068364X20030035

The thermal transformation of coal and lignite in the presence of Cu(NO
3
)
2
activator (5 wt %) is investigated as a function of the atmospheric composition. The copper nitrate is supported on to the samples by the incipient wetness with Cu(NO
3
)
2
solution in water and alcohol. The effect of the activator is studied as a function of the gas (air/argon) composition, by thermogravimetric analysis with heating at 10°C/min in the range 25–800°C, at atmospheric pressure. With change in gas composition, the activity of Cu(NO
3
)
2
changes. Specifically, the thermal transformation is shifted to lower temperature: Δ
t
= 33°C for lignite and 70°C for coal. With increase in oxidant (air) content in the gas, the activity of the added Cu(NO
3
)
2
increases: that is, Δ
t
increases. By mass spectrometry, the gaseous oxidation products of the coal are analyzed. The upper temperature limits on the peaks of nitrogen-oxide (NO
x
) liberation are determined as a function of the gas composition.