title   
  

Catalytic decarboxylation of Elbistan lignite

Özvatan, Sümer and Yürüm, Yuda (2002) Catalytic decarboxylation of Elbistan lignite. Energy Sources, 24 (6). pp. 581-589. ISSN 0090-8312

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Official URL: http://dx.doi.org/10.1080/00908310290086581

Abstract

Decarboxylation of low-rank Turk-ish Elbistan lignite at low temperatures by utilizing cupric sulphate as a catalyst was investigated. The gross calorific value of the lignite treated with 4 wt% Cu2+ and decarboxylated at 200degreesC for 30 min increased about 40%. Fourier transform infrared (FTIR) and solid-state C-13 nuclear magnetic resonance (NMR) methods have been used to investigate the changes in the oxygen functional groups in Elbistan lignite that occurred during decarboxylation. Activation energies of the decarboxylation reactions were calculated as 100.7 kJ/mol and 44.5 kJ/mol for original and treated Elbistan lignite samples, respectively. The sequence in the rate of loss of the oxygen functional groups was as carboxyl, carbonyl, hydroxyl, and carboxylate ions. With the presence of Cu2+ ions, decarboxylation reactions procedeed with higher rates by a dissociative mechanism to release CO or CO2 simply by heating.

Item Type:Article
Uncontrolled Keywords:decarboxylation; low-rank lignite; calorific value
Subjects:T Technology > TP Chemical technology > TP0155-156 Chemical engineering
ID Code:14041
Deposited By:Yuda Yürüm
Deposited On:14 Jun 2010 17:11
Last Modified:25 May 2011 14:08

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