Abstract
Two low-rank Turkish coals, Tuncbilek (TB) subbituminous and Goynuk (GN) lignite, were subjected to low-severity heat treatment with or without added water, under N2 or H2 atmospheres at 285−330 °C, both as original coals and after demineralization with HCl(aq)/HF(aq) treatment. The samples processed in H2−H2O combination seemed to be more dissociated or decomposed than those processed in N2−H2O or under H2 without water. Gas analyses and spectroscopy of samples clearly indicated an effect of water in enhancing decarboxylation reactions and that oxygen rejection from the coals was mainly due to CO2 formation. Water also enhanced the cleavage of aryl−ether bonds. These cleavage reactions are more pronounced in GN coal than in TB coal, probably due to a higher concentration of activated ether structures in the former coal. The disruption of noncovalent interactions is considered mainly responsible for the extensive depolymerization of TB coal. The role of H2 in these heat treatment conditions is considered ...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
