Non-isothermal oxidation of coal with Ce(NO 3 ) 3 and Cu(NO 3 ) 2 additives

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Abstract

Abstract: Non-isothermal oxidation of brown coal with 5 wt% of Cu(NO 3 ) 2 , 5 wt% of Ce(NO 3 ) 3 and {2.5 wt% Cu(NO 3 ) 2 + 2.5 wt% Ce(NO 3 ) 3 } additives was studied. The introduction of additives was carried out by an incipient wet impregnation method to ensure uniform distribution of cerium and copper nitrates within the structure of coal powdery samples (according to SEM and EDX mapping). The samples reactivity was studied in an isothermal oxidation regime at 200 °C (1 h) and by DSC/TGA at 2.5 °C/min heating rate. The additives implementation was found to reduce significantly the oxidation onset temperature (ΔT i = 20–55 °C), the samples oxidation delay time (Δt i = 2–22 min) and overall duration of the oxidation process (Δt c = 8–16 min). The additives efficiency could be graded in accordance with the activation on the coal oxidation in the following row: Cu(NO 3 ) 2 > {Cu(NO 3 ) 2 + Ce(NO 3 ) 3 } > Ce(NO 3 ) 3 . According to the mass spectroscopy, the obtained row of activation correlates well with the initial temperature of the studied nitrate’s decomposition (from 190 to 223 °C). A presence of nitrates was found to change significantly the trend of heat release taking place during the oxidation of coal samples (according to DSC/TGA data). The influence of coal morphology and volatiles content in initial sample on the parameters of the oxidation process was studied as well. Activation energy (E a ) of the coal oxidation was calculated using Coats–Redfern method. Maximum decrease in E a from 69 to 58 kJ/mol was observed for the samples with Cu(NO 3 ) 2 . Graphical abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)37-50
Number of pages14
JournalInternational Journal of Coal Science and Technology
Volume6
Issue number1
DOIs
Publication statusPublished - 1 Mar 2019

Fingerprint

Coal
coal
oxidation
Oxidation
Nitrates
nitrate
Chemical activation
additive
cerium
Lignite
Cerium
Heating rate
lignite
Impregnation
activation energy
Energy dispersive spectroscopy
Time delay
Activation energy
temperature
scanning electron microscopy

Keywords

  • Cerium nitrate
  • Coal oxidation
  • Copper nitrate
  • DSC/DTG/TGA/MS
  • Reactivity

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

Cite this

@article{ddfefb91726c4173b25738ec5b66322e,
title = "Non-isothermal oxidation of coal with Ce(NO 3 ) 3 and Cu(NO 3 ) 2 additives",
abstract = "Abstract: Non-isothermal oxidation of brown coal with 5 wt{\%} of Cu(NO 3 ) 2 , 5 wt{\%} of Ce(NO 3 ) 3 and {2.5 wt{\%} Cu(NO 3 ) 2 + 2.5 wt{\%} Ce(NO 3 ) 3 } additives was studied. The introduction of additives was carried out by an incipient wet impregnation method to ensure uniform distribution of cerium and copper nitrates within the structure of coal powdery samples (according to SEM and EDX mapping). The samples reactivity was studied in an isothermal oxidation regime at 200 °C (1 h) and by DSC/TGA at 2.5 °C/min heating rate. The additives implementation was found to reduce significantly the oxidation onset temperature (ΔT i = 20–55 °C), the samples oxidation delay time (Δt i = 2–22 min) and overall duration of the oxidation process (Δt c = 8–16 min). The additives efficiency could be graded in accordance with the activation on the coal oxidation in the following row: Cu(NO 3 ) 2 > {Cu(NO 3 ) 2 + Ce(NO 3 ) 3 } > Ce(NO 3 ) 3 . According to the mass spectroscopy, the obtained row of activation correlates well with the initial temperature of the studied nitrate’s decomposition (from 190 to 223 °C). A presence of nitrates was found to change significantly the trend of heat release taking place during the oxidation of coal samples (according to DSC/TGA data). The influence of coal morphology and volatiles content in initial sample on the parameters of the oxidation process was studied as well. Activation energy (E a ) of the coal oxidation was calculated using Coats–Redfern method. Maximum decrease in E a from 69 to 58 kJ/mol was observed for the samples with Cu(NO 3 ) 2 . Graphical abstract: [Figure not available: see fulltext.].",
keywords = "Cerium nitrate, Coal oxidation, Copper nitrate, DSC/DTG/TGA/MS, Reactivity",
author = "Larionov, {Kirill Borisovich} and Gromov, {Alexander Alexandrovich}",
year = "2019",
month = "3",
day = "1",
doi = "10.1007/s40789-018-0229-y",
language = "English",
volume = "6",
pages = "37--50",
journal = "International Journal of Coal Science and Technology",
issn = "2095-8293",
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TY - JOUR

T1 - Non-isothermal oxidation of coal with Ce(NO 3 ) 3 and Cu(NO 3 ) 2 additives

AU - Larionov, Kirill Borisovich

AU - Gromov, Alexander Alexandrovich

PY - 2019/3/1

Y1 - 2019/3/1

N2 - Abstract: Non-isothermal oxidation of brown coal with 5 wt% of Cu(NO 3 ) 2 , 5 wt% of Ce(NO 3 ) 3 and {2.5 wt% Cu(NO 3 ) 2 + 2.5 wt% Ce(NO 3 ) 3 } additives was studied. The introduction of additives was carried out by an incipient wet impregnation method to ensure uniform distribution of cerium and copper nitrates within the structure of coal powdery samples (according to SEM and EDX mapping). The samples reactivity was studied in an isothermal oxidation regime at 200 °C (1 h) and by DSC/TGA at 2.5 °C/min heating rate. The additives implementation was found to reduce significantly the oxidation onset temperature (ΔT i = 20–55 °C), the samples oxidation delay time (Δt i = 2–22 min) and overall duration of the oxidation process (Δt c = 8–16 min). The additives efficiency could be graded in accordance with the activation on the coal oxidation in the following row: Cu(NO 3 ) 2 > {Cu(NO 3 ) 2 + Ce(NO 3 ) 3 } > Ce(NO 3 ) 3 . According to the mass spectroscopy, the obtained row of activation correlates well with the initial temperature of the studied nitrate’s decomposition (from 190 to 223 °C). A presence of nitrates was found to change significantly the trend of heat release taking place during the oxidation of coal samples (according to DSC/TGA data). The influence of coal morphology and volatiles content in initial sample on the parameters of the oxidation process was studied as well. Activation energy (E a ) of the coal oxidation was calculated using Coats–Redfern method. Maximum decrease in E a from 69 to 58 kJ/mol was observed for the samples with Cu(NO 3 ) 2 . Graphical abstract: [Figure not available: see fulltext.].

AB - Abstract: Non-isothermal oxidation of brown coal with 5 wt% of Cu(NO 3 ) 2 , 5 wt% of Ce(NO 3 ) 3 and {2.5 wt% Cu(NO 3 ) 2 + 2.5 wt% Ce(NO 3 ) 3 } additives was studied. The introduction of additives was carried out by an incipient wet impregnation method to ensure uniform distribution of cerium and copper nitrates within the structure of coal powdery samples (according to SEM and EDX mapping). The samples reactivity was studied in an isothermal oxidation regime at 200 °C (1 h) and by DSC/TGA at 2.5 °C/min heating rate. The additives implementation was found to reduce significantly the oxidation onset temperature (ΔT i = 20–55 °C), the samples oxidation delay time (Δt i = 2–22 min) and overall duration of the oxidation process (Δt c = 8–16 min). The additives efficiency could be graded in accordance with the activation on the coal oxidation in the following row: Cu(NO 3 ) 2 > {Cu(NO 3 ) 2 + Ce(NO 3 ) 3 } > Ce(NO 3 ) 3 . According to the mass spectroscopy, the obtained row of activation correlates well with the initial temperature of the studied nitrate’s decomposition (from 190 to 223 °C). A presence of nitrates was found to change significantly the trend of heat release taking place during the oxidation of coal samples (according to DSC/TGA data). The influence of coal morphology and volatiles content in initial sample on the parameters of the oxidation process was studied as well. Activation energy (E a ) of the coal oxidation was calculated using Coats–Redfern method. Maximum decrease in E a from 69 to 58 kJ/mol was observed for the samples with Cu(NO 3 ) 2 . Graphical abstract: [Figure not available: see fulltext.].

KW - Cerium nitrate

KW - Coal oxidation

KW - Copper nitrate

KW - DSC/DTG/TGA/MS

KW - Reactivity

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U2 - 10.1007/s40789-018-0229-y

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