Open Access Nano Express

Catalytic pyrolysis of waste rice husk over mesoporous materials

Mi-Jin Jeon1, Seung-Soo Kim2, Jong-Ki Jeon3, Sung Hoon Park4, Ji Man Kim5, Jung Min Sohn6, See-Hoon Lee6 and Young-Kwon Park17*

Author Affiliations

1 Graduate School of Energy and Environmental System Engineering, University of Seoul, Seoul, 130-743, Korea

2 Department of Chemical Engineering, Kangwon National University, Samcheok, 245-711, Korea

3 Department of Chemical Engineering, Kongju National University, Cheonan, 330-717, Korea

4 Department of Environmental Engineering, Sunchon National University, Suncheon, 540-742, Korea

5 Department of Chemistry, BK21 School of Chemical Materials Science and Department of Energy Science, Sungkyunkwan University, Suwon, 440-746, Korea

6 Department of Mineral Resources and Energy Engineering, Chonbuk National University, Jeonju, 561-756, Korea

7 School of Environmental Engineering, University of Seoul, Seoul, 130-743, Korea

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Nanoscale Research Letters 2012, 7:18  doi:10.1186/1556-276X-7-18

Published: 5 January 2012

Abstract

Catalytic fast pyrolysis of waste rice husk was carried out using pyrolysis-gas chromatography/mass spectrometry [Py-GC/MS]. Meso-MFI zeolite [Meso-MFI] was used as the catalyst. In addition, a 0.5-wt.% platinum [Pt] was ion-exchanged into Meso-MFI to examine the effect of Pt addition. Using a catalytic upgrading method, the activities of the catalysts were evaluated in terms of product composition and deoxygenation. The structure and acid site characteristics of the catalysts were analyzed by Brunauer-Emmett-Teller surface area measurement and NH3 temperature-programmed desorption analysis. Catalytic upgrading reduced the amount of oxygenates in the product vapor due to the cracking reaction of the catalysts. Levoglucosan, a polymeric oxygenate species, was completely decomposed without being detected. While the amount of heavy phenols was reduced by catalytic upgrading, the amount of light phenols was increased because of the catalytic cracking of heavy phenols into light phenols and aromatics. The amount of aromatics increased remarkably as a result of catalytic upgrading, which is attributed to the strong Brönsted acid sites and the shape selectivity of the Meso-MFI catalyst. The addition of Pt made the Meso-MFI catalyst even more active in deoxygenation and in the production of aromatics.

Keywords:
Py-GC/MS; rice husk; Meso-MFI; Pt-Meso-MFI