The Effect of Oxygen-Functional Groups on the Water Resistance of Lignite Briquette

2012 ◽  
Vol 560-561 ◽  
pp. 550-554
Author(s):  
Hong Ying Liu ◽  
Xiao Hong Lu ◽  
Xin Nan Zhao ◽  
Yu Li Yang
Keyword(s):  
High Temperature ◽  
Functional Groups ◽  
Water Resistance ◽  
Carboxyl Groups ◽  
Coal Resources ◽  
Tube Reactor ◽  
Oxygen Functional Groups ◽  
Effect Of Oxygen

Because of the increased demand for coal resources, the use of low-quality lignite increased. Heating-Pressing Utilizing is a better method to process fine lignite particles. The water resistance of lignite briquettes is important. In this study, the Baorixile lignite was dried in a lab-scale tube reactor and on pilot line. The oxygenic functional groups of lignite were analyzed at different temperature. The result indicated that carboxyl groups and phenols decreased as the temperature increasing, and phenols plays a more important role on the waterproof of lignite briquettes, especially at high temperature.

scholarly journals Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li–O2 Battery Cathode

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4196
Author(s):  
Ji Hyeon Lee ◽  
Hyun Wook Jung ◽  
In Soo Kim ◽  
Min Park ◽  
Hyung-Seok Kim
Keyword(s):  
Functional Groups ◽  
Atomic Layer ◽  
Free Standing ◽  
Coating Technology ◽  
Oxygen Functional Groups ◽  
Layer Deposition ◽  
Discharge Product ◽  
Effect Of Oxygen ◽  
Surface Modified ◽  
Electrochemical Evaluation

In this study, carbon nanotubes (CNTs) were used as cathodes for lithium–oxygen (Li–O2) batteries to confirm the effect of oxygen functional groups present on the CNT surface on Li–O2 battery performance. A coating technology using atomic layer deposition was introduced to remove the oxygen functional groups present on the CNT surface, and ZnO without catalytic properties was adopted as a coating material to exclude the effect of catalytic reaction. An acid treatment process (H2SO4:HNO3 = 3:1) was conducted to increase the oxygen functional groups of the existing CNTs. Therefore, it was confirmed that ZnO@CNT with reduced oxygen functional groups lowered the charging overpotential by approximately 230 mV and increased the yield of Li2O2, a discharge product, by approximately 13%. Hence, we can conclude that the ZnO@CNT is suitable as a cathode material for Li–O2 batteries.

scholarly journals High Temperature Vacuum Annealing and Hydrogenation Modification of Exfoliated Graphite Nanoplatelets

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Xiaobing Li ◽  
Sanjib Biswas ◽  
Lawrence T. Drzal
Keyword(s):  
High Temperature ◽  
Functional Groups ◽  
Vacuum Annealing ◽  
Atmospheric Oxygen ◽  
Graphite Nanoplatelets ◽  
Highly Active ◽  
Oxygen Functional Groups ◽  
Defect Sites ◽  
Capacitance Characteristics ◽  
Oxygen Groups

Highly active defect sites on the edges of graphene automatically capture oxygen from air to form various oxygen groups. A two-step procedure to remove various oxygen functional groups from the defect sites of exfoliated graphene nanoplatelets (GNPs) has been developed to reduce the atomic oxygen concentration from 9.5% to 4.8%. This two-step approach involves high temperature vacuum annealing followed by hydrogenation to protect the reduced edge carbon atoms from recombining with the atmospheric oxygen. The reduced GNPs exhibit decreased surface resistance and graphitic potential-dependent capacitance characteristics compared to the complex potential-dependent capacitance characteristics exhibited by the unreduced GNPs as a result of the removal of the oxygen functional groups present primarily at the edges. These reduced GNPs also exhibit high electrochemical cyclic stability for electrochemical energy storage applications.

Adsorption of volatile sulphur compounds onto modified activated carbons: Effect of oxygen functional groups

2013 ◽  
Vol 258-259 ◽  
pp. 77-83 ◽  
Author(s):  
Esther Vega ◽  
Jesús Lemus ◽  
Alba Anfruns ◽  
Rafael Gonzalez-Olmos ◽  
José Palomar ◽  
...  
Keyword(s):  
Functional Groups ◽  
Activated Carbons ◽  
Sulphur Compounds ◽  
Oxygen Functional Groups ◽  
Volatile Sulphur Compounds ◽  
Effect Of Oxygen ◽  
Modified Activated Carbons

Non-nitrogen doped and non-metal oxygen reduction electrocatalysts based on carbon nanotubes: mechanism and origin of ORR activity

2014 ◽  
Vol 7 (6) ◽  
pp. 1950-1958 ◽  
Author(s):  
Keiko Waki ◽  
Raymond A. Wong ◽  
Haryo S. Oktaviano ◽  
Takuya Fujio ◽  
Takuro Nagai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Oxygen Reduction ◽  
Functional Groups ◽  
Topological Defects ◽  
Nitrogen Doped ◽  
Metal Impurities ◽  
Oxygen Functional Groups ◽  
Orr Activity ◽  
The Creation

The proposed origin of the improved ORR activity is unlikely to be from residual metal impurities but from the creation of topological defects caused by the removal of high temperature CO desorbing oxygen functional groups.

Effect of oxygen functional groups on synthetic carbons on liquid phase oxidation of cyclohexanone

Carbon ◽  
2002 ◽  
Vol 40 (8) ◽  
pp. 1267-1278 ◽  
Author(s):  
Anne Pigamo ◽  
Michèle Besson ◽  
Bernard Blanc ◽  
Pierre Gallezot ◽  
Andy Blackburn ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Functional Groups ◽  
Liquid Phase Oxidation ◽  
Oxygen Functional Groups ◽  
Phase Oxidation ◽  
Effect Of Oxygen
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