Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/4640
Title: Direct liquefaction of high-sulfur coals: Effect of the catalyst, the solvent, and the mineral matter
Authors: Gözmen, Belgin
Artok, Levent
Erbatur, Gaye
Erbatur, Oktay
Keywords: Hydrodesulfurization
Lignite
Catalysts
Crosslinking
Desulfurization
Hydrogenation
Issue Date: Sep-2002
Publisher: American Chemical Society
Source: Gözmen, B, Artok, L., Erbatur, G., and Erbatur, O. (2002). Direct liquefaction of high-sulfur coals: Effect of the catalyst, the solvent, and the mineral matter. Energy and Fuels, 16(5), 1040-1047. doi:10.1021/ef0102667
Abstract: Two low-rank coals with high sulfur contents (Gediz subbituminous coal: 7.6 wt % S:dry basis. Çayirhan lignite: 5.7 wt% S:dry basis.) were subjected to hydroliquefaction. Liquefaction conditions included dry or solvent mediated runs under pressurized hydrogen without added catalyst or with the impregnated catalyst precursor ammonium heptamolybdate (AHM). Gediz coal having higher sulfur content gave 90% conversion in the absence of catalyst and solvent. Maximum conversion (98%) and maximum oil + gas yield (70%) from this coal were obtained by impregnating AHM onto coal and carrying out liquefaction in H 2/tetralin system at 450 °C for 30 min. Under the same conditions, Çayirhan lignite gave 85% conversion and 70.5% oil + gas yield. The superior hydrodesulfurization effect of impregnated AHM on the oil fraction when used in the absence of solvent (less than 0.1% S in lignite's oil and less than 1% S in subbituminous coal's oil following one-stage hydrogenation) is a promising finding of this work. AHM was found to be much more effective in liquefaction of Çayirhan lignite and this has been ascribed to the well-dispersion of AHM throughout this lignite's structure via a cation-exchange mechanism through oxygen functionalities. Strong evidence for the catalytic effect of clay minerals in coal structure on char-forming reactions during liquefaction was observed by making use of liquefaction reactions of demineralized coal samples. It was also observed that tetralin had a retarding effect on the condensation and subsequent cross-linking reactions.
URI: http://doi.org/10.1021/ef0102667
http://hdl.handle.net/11147/4640
ISSN: 0887-0624
0887-0624
1520-5029
Appears in Collections:Chemistry / Kimya
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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