Title:	Effect of ion-exchanged calcium, barium and magnesium on cross-linking reactions during direct liquefaction of oxidized lignite
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Abstract:	In this work the influences of alkaline earthmetals on cross-linking reactions (CLRs) during direct liquefaction of lignitewere investigated. The oxidized lignite,which has been proved to be appropriate for quantitatively examine the extent of CLR during direct liquefaction, was used as a model coal to study the effects of ion-exchanged calcium, barium and magnesium on CLR during direct liquefaction of the oxidized lignite. The amounts of tetrahydrofuran (THF) insoluble solid products after liquefaction were used to quantitatively evaluate the CLR during liquefaction of the ion-exchanged coal. The results show that the oxidized coal is appropriate to quantitatively examine the extent of CLR and the targeted ions are exchanged to the oxidized coal in the form of highly-dispersed ion. The ion-exchanged Mg2+ suppresses the CLR during direct liquefaction of coal at both lowand high temperature. However, the exchanged Ca2+ always promotes the CLR at the selected temperatures. While the exchanged Ba2+ promotes the CLR at low temperature, but suppresses it at high temperature.
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Page number:	34-39
Issue:	1
Subject:	有机化学
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PubYear:	2012
Volume:	94
Unit code:	122214
Publication name:	Fuel processing technology
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