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Fast and catalytic pyrolysis of xylan: Effects
of temperature and M/HZSM-5 (M= Fe, Zn) catalysts on pyrolytic products |
| Xifeng ZHU,Qiang LU,Wenzhi LI,Dong ZHANG, |
| Biomass Clean Energy
Laboratory, University of Science and Technology of China, Hefei 230026,
China; |
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Abstract Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was employed to achieve fast pyrolysis of xylan and on-line analysis of pyrolysis vapors. Tests were conducted to investigate the effects of temperature on pyrolytic products, and to reveal the effect of HZSM-5 and M/HZSM-5 (M= Fe, Zn) zeolites on pyrolysis vapors. The results showed that the total yield of pyrolytic products first increased and then decreased with the increase of temperature from 350°C to 900°C. The pyrolytic products were complex, and the most abundant products included hydroxyacetaldehyde, acetic acid, 1-hydroxy-2-propanone, 1-hydroxy-2-butanone and furfural. Catalytic cracking of pyrolysis vapors with HZSM-5 and M/HZSM-5 (M= Fe, Zn) catalysts significantly altered the product distribution. Oxygen-containing compounds were reduced considerably, and meanwhile, a lot of hydrocarbons, mainly toluene and xylenes, were formed. M/HZSM-5 catalysts were more effective than HZSM-5 in reducing the oxygen-containing compounds, and therefore, they helped to produce higher contents of hydrocarbons than HZSM-5.
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| Keywords
xylan
fast pyrolysis
catalytic pyrolysis
Py-GC/MS
HZSM-5
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Issue Date: 05 September 2010
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