Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 15, Pages 9679-9687Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2017.01.077
Keywords
SL+ char; Sodium ion; Steam gasification; Carbon crystallite structure
Categories
Funding
- National Natural Science Foundation of China [21676149, 21606134, 21566029, 21566028, 21266017]
- Major Basic Research Projects of Inner Mongolia [2014MS0220]
- Major Basic Open Research Projects of Inner Mongolia [2015BS0206]
- Natural Science Foundation of Inner Mongolia
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The catalytic effect of sodium on the demineralized Shengli (SL) lignite char microstructure and the performance of steam gasification were studied. Various sodium compounds including NaNO3, CH3COONa, Na2CO3 and NaOH were loaded on the demineralized coal samples, respectively, and the steam gasification was tested on the fix-bed reactor. The char samples were characterized by X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS) and FT-IR spectroscopy. Experimental results showed that sodium hydroxide loaded samples exhibited the highest gasification reactivity among the coal samples prepared. With the increase of the alkalinity of sodium compounds, the carbon crystallite structure tended to be disordered. In the process of pyrolysis, the introduction of sodium species promoted the ring-opening and polycondensation process of the chemicals in the coal samples. The possible reaction mechanism might be inferred that the sodium ions may replace the hydrogen ions in the oxygen-containing functional groups to form sodium phenolate intermediate, which may be critical for the catalytic effect of sodium species during gasification. It was speculated that the ring-opening of the condensation aromatic nucleus was the rate-limiting step in the whole process of gasification. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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