Evolution lignite mesopore structure during drying. Effect of temperature and heating time

Salmas, CE; Tsetsekou, AH; Hatzilyberis, KS; Androutsopoulos, GP

dc.contributor.author	Salmas, CE	en
dc.contributor.author	Tsetsekou, AH	en
dc.contributor.author	Hatzilyberis, KS	en
dc.contributor.author	Androutsopoulos, GP	en
dc.date.accessioned	2014-03-01T01:16:34Z
dc.date.available	2014-03-01T01:16:34Z
dc.date.issued	2001	en
dc.identifier.issn	0737-3937	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14088
dc.subject	CPSM (corrugated pore structure model)	en
dc.subject	Lignite drying	en
dc.subject	Nitrogen sorption	en
dc.subject	Pore structure	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	Coal combustion	en
dc.subject.other	Drying	en
dc.subject.other	Lignite	en
dc.subject.other	Mass transfer	en
dc.subject.other	Sorption	en
dc.subject.other	Thermal effects	en
dc.subject.other	Mesopore volume	en
dc.subject.other	Mesoporous materials	en
dc.subject.other	drying	en
dc.subject.other	heating	en
dc.subject.other	lignite processing	en
dc.subject.other	microstructure	en
dc.subject.other	temperature effect	en
dc.title	Evolution lignite mesopore structure during drying. Effect of temperature and heating time	en
heal.type	journalArticle	en
heal.identifier.primary	10.1081/DRT-100001351	en
heal.identifier.secondary	http://dx.doi.org/10.1081/DRT-100001351	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	The knowledge of the intrinsic pore structure of coals is significant in elucidating the kinetics of mass transport and chemical reaction that leads to design of more efficient coal combustion and conversion equipment. The results of pore structure studies of Creek lignite are reported in this work. Isothermal drying of Creek lignite samples, under vacuum, caused mesopore structure evolution despite the severe (similar to 50%) particle size contraction due to heating. Mesopore volume and surface area were increased as the drying temperature was raised to 200 degreesC while further drying up to 250 degreesC caused a mesopore volume and surface area decrease. Lignite drying at 100 degreesC for up to 3 h resulted in a monotonic increase of the mesopore structure properties while heating for a longer period i.e., 6 h, despite a slight increase of weight loss, caused pore volume and surface area reduction. Nitrogen sorption (77 K) hysteresis data obtained for partially dried samples have been processed to deduce BET surface area and pore size distributions (PSD) by using both the Roberts and a new method based on a Corrugated Pore Structure Model (CPSM-nitrogen) methods. The latter method was applied successfully in hysteresis loop simulations and predicted pore surface areas consistent with the respective BET values. Bimodal PSD have been detected with one peak at 3 nm and the second at 20 nm while surface area varied over the range 2.98-5.30 m(2)/g, Dry Greek lignite has shown a higher mesopore volume than that of several American and Canadian coals of varying rank. Mesopore volume distribution of dry Greek lignite, obtained from nitrogen sorption data, agree well with those deduced from mercury penetration data corrected for coal compressibility.	en
heal.publisher	MARCEL DEKKER INC	en
heal.journalName	Drying Technology	en
dc.identifier.doi	10.1081/DRT-100001351	en
dc.identifier.isi	ISI:000170045700003	en
dc.identifier.volume	19	en
dc.identifier.issue	1	en
dc.identifier.spage	35	en
dc.identifier.epage	64	en