Title
Fast pyrolysis of poplar wood sawdust with La-containing SBA-15 catalyst by PY-GC/MS analysis
Authors
XIAOLI GU XU MA LIXIAN LI CHENG LIU KANGHUA CHENG and ZHONGZHENG LI

Received February 13, 2013
Published Volume 48 Issue 3-4 March-April
Keywords lanthanum containing SBA-15, poplar wood sawdust, Py-GC/MS

Abstract
The catalyst was prepared by immobilizing lanthanum rare element on the periodic mesoporous channels of siliceous SBA-15. Powder X-ray diffraction data and ICP-AES revealed that the host retains its hexagonal mesoporous structure after immobilization and most of the lanthanum species are better dispersed in the calcinated materials. The surface area and pore size of La/SBA-15 were considerably decreased, indicating the intrapore confinement of the lanthanum species. La-containing SBA-15 catalyst was employed for catalytic cracking of Poplar Wood Sawdust (PWS) fast pyrolysis vapors, using analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The La/SBA-15 catalyst displayed prominent capabilities to crack the lignin-derived oligomers to phenol or monomeric phenolic compounds without the carbonyl group and unsaturated C-C bond on the side chain. Moreover, the catalyst also significantly decreased the linear aldehydes and decarbonylated furan compounds. In addition, the catalyst slightly decreased the acids, while benzene or aromatic derivative hydrocarbons were increased. The above catalytic capability of La/SBA-15 catalyst was enhanced with the introduction of La into SBA-15 catalyst.