期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 84, 期 2, 页码 165-169出版社
ELSEVIER
DOI: 10.1016/j.jaap.2009.01.007
关键词
H2S uptake; Coke; Effect of silicon; Demineralization; Elevated temperature
资金
- Natural Science Foundation of China [20576138, 20736001]
- Major State Basic Research Project [2004CB217602]
The effect of silicon, a non-active element, on uptake of H2S by carbon matrix of a coke Linder elevated temperature was studied. A quartz tube reactor was coupled with a flame photometric detector (FPD). The sulfur uptake/temperature programmed desorption (SU/TPD) process was used to simulate coal pyrolysis or coking process. The SU was carried out at 300 degrees C. The TPD was carried out from 300 to 4000 degrees C to desorb physically or loosely bonded sulfur species. Temperature programmed oxidation (TPO) process was used to measure amount of Sulfur chemically or tightly imbibed by coke. The results show that the H2S uptake is higher for a demineralized coke than that for its parent coke. The presence of silicon showed a significant negative effect in H2S uptake. The H2S uptake decreased gradually as the silicon content increased from 0 to 0.6% (w/w). XPS and SEM-EDX were used to characterize silicon on the coke surface. The results show that the silicon loaded on the coke surface is in the form of SiO2 or metal-silicates which may possibly inhibit the reaction of H2S and coke. The silicon and sulfur distribute unevenly on the coke surface and tend to concentrate at similar locations, which indicate that the active sites for H2S adsorption and reaction at high temperatures are also active for attracting silicon species, (c) 2009 Elsevier B.V. All rights reserved.
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