Catalytic effect of sodium components on the microstructure and steam gasification of demineralized Shengli lignite char |
| |
Authors: | Rongrong Lu Jie Wang Quansheng Liu Yan Wang Gusi Te Yanpeng Ban Na Li Xiaorong Zhang Runxia He Huacong Zhou Keduan Zhi |
| |
Affiliation: | College of Chemical Engineering, Inner Mongolia University of Technology, Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resource, Hohhot 010051, Inner Mongolia, China |
| |
Abstract: | 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. |
| |
Keywords: | Sodium ion Steam gasification Carbon crystallite structure |
本文献已被 ScienceDirect 等数据库收录! |
|