Catalytic effects of eight inorganic additives on pyrolysis of pine wood sawdust by microwave heating
✍ Scribed by Ming-qiang Chen; Jun Wang; Ming-xu Zhang; Ming-gong Chen; Xi-feng Zhu; Fan-fei Min; Zhi-cheng Tan
- Book ID
- 104019521
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 422 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0165-2370
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✦ Synopsis
In this paper, pyrolysis of pine wood sawdust was carried out by microwave heating at ca. 470 8C under dynamic nitrogen atmosphere. Eight inorganic additives (NaOH, Na 2 CO 3 , Na 2 SiO 3 , NaCl, TiO 2 , HZSM-5, H 3 PO 4 , Fe 2 (SO 4 ) 3 ) were investigated in terms of their catalytic effects on the pyrolysis. All of the eight additives have increased yields of solid products greatly and decreased yields of gaseous products more or less. Yields of liquid products have not subjected to dramatic change. The incondensable gases produced from pyrolysis consist mainly of H 2 , CH 4 , CO and CO 2 . All of the eight additives have made these gases evolve earlier, among which the four sodium additives have the most marked effect. All the additives have made the amount of CH 4 and CO 2 decrease, while all of them except NaCl, TiO 2 and Fe 2 (SO 4 ) 3 have made that of H 2 increase and all of them except Na 2 SiO 3 and HZSM-5 have made that of CO decrease. Alkaline sodium compounds NaOH, Na 2 CO 3 and Na 2 SiO 3 favor H 2 formation most. The most abundant organic component in the liquid products from pyrolysis of untreated sample and samples treated by all the additives except H 3 PO 4 and Fe 2 (SO 4 ) 3 is acetol. All the four sodium compounds favor acetol formation reaction and the selection increasing effect follows the order of NaOH > Na 2 CO 3 % Na 2 SiO 3 > NaCl. TiO 2 goes against the formation of acetol, HZSM-5 has no marked effect on acetol formation. The two dominant organic components identified in the liquid products from pyrolysis of H 3 PO 4 and Fe 2 (SO 4 ) 3 treated samples are both fufural and 4-methyl-2-methoxy-phenol. A possible pathway for acetol formation is tentatively proposed.