Pyrolysis behaviors of four lignin polymers isolated from the same pine wood

Shurong Wang; Bin Ru; Haizhou Lin; Wuxing Sun; Zhongyang Luo

doi:10.1016/j.biortech.2015.01.127

Pyrolysis behaviors of four lignin polymers isolated from the same pine wood

Bioresour Technol. 2015 Apr:182:120-127. doi: 10.1016/j.biortech.2015.01.127. Epub 2015 Feb 7.

Authors

Shurong Wang¹, Bin Ru², Haizhou Lin², Wuxing Sun², Zhongyang Luo²

Affiliations

¹ State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China. Electronic address: srwang@zju.edu.cn.
² State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.

PMID: 25686545
DOI: 10.1016/j.biortech.2015.01.127

Abstract

Four lignin polymers, alkali lignin (AL), klason lignin (KL), organosolv lignin (OL), and milled wood lignin (MWL), were isolated from the same pine wood. Structural characterization by FTIR and (13)C NMR indicated that the four lignins have different structural features. Their pyrolysis behaviors were analyzed by TG-FTIR and Py-GC/MS. Thermally unstable ether bonds and side branches were well-preserved in AL and MWL, but were broken in OL and KL. Pyrolysis of AL and KL produce more phenols at low temperature by the breakage of ether bonds. AL and KL show lower activation energies in the main degradation stage, quantified by a distribution activation energy model with two linearly combined Gaussian functions. The evolution behaviors of typical gaseous products, CH4, CO2, and CO, were analyzed, and insights about the correlation between chemical structure and pyrolysis behavior were obtained.

Keywords: Isolation; Kinetics; Lignin; Mechanism; Pyrolysis.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Carbon Dioxide / chemistry
Kinetics
Lignin / chemistry*
Magnetic Resonance Spectroscopy
Methane / chemistry
Phenols / chemistry
Pinus / chemistry
Spectroscopy, Fourier Transform Infrared
Thermogravimetry
Wood / chemistry*

Substances

Phenols
Carbon Dioxide
Lignin
Methane