Frontiers of Environmental Science & Engineering
>> 2012,
Volume 6,
Issue 3
doi:
10.1007/s11783-012-0410-2
RESEARCH ARTICLE
Catalytic fast pyrolysis of Kraft lignin with HZSM-5 zeolite for producing aromatic hydrocarbons
1. School of Environment, Tsinghua University, Beijing 100084, China; 2. State Key Joint Laboratory of Environmental Simulation and Pollution Control, Beijing 100084, China; 3. Department of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
Available online: 2012-06-01
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Abstract
Catalytic fast pyrolysis (CFP) of Kraft lignins with HZSM-5 zeolite for producing aromatics was investigated using analytical pyrolysis methods. Two Kraft lignins were fast pyrolyzed in the absence and presence of HZSM-5 in a Curie-point pyrolyzer. Without the catalyst, fast pyrolysis of lignin predominantly produced phenols and guaiacols that were derived from the subunits of lignin. However, the presence of HZSM-5 changed the product distribution dramatically. As the SiO /Al O ratio of HZSM-5 decreased from 200 to 25 and the catalyst-to-lignin ratio increased from 1 to 20, the lignin-derived oxygenates progressively decreased to trace and the aromatics increased substantially. The aromatic yield increased considerably as the pyrolysis temperature increased from 500°C to 650°C, but then decreased with yet further increase of pyrolysis temperature. Under optimal reaction conditions, the aromatic yields were 2.0 wt.% and 5.2 wt.% for the two lignins that had effective hydrogen indexes of 0.08 and 0.35.
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