Volatile-char interactions during biomass pyrolysis: Cleavage of C-C bond in a β-5 lignin model dimer by amino-modified graphitized carbon nanotube

Huang Y 1 , Liu S 1 , Zhang J 1 , Syed-Hassan SSA 2 , Hu X 3 , Sun H 4 Show all authors , Zhu X 5 , Zhou J 1 , Zhang S 6 , Zhang H 1

Affiliations 

  • 1 Lab of Biomass Energy and Functional Carbon Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
  • 2 Faculty of Chemical Engineering, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia
  • 3 School of Material Science and Engineering, University of Jinan, Jinan 250022, Shandong, China
  • 4 School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Western Australia 6027, Australia
  • 5 School of Material Science and Engineering, Hanshan Normal University, Chaozhou 521041, China
  • 6 Lab of Biomass Energy and Functional Carbon Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China. Electronic address: s.zhang@njfu.edu.cn
Bioresour Technol, 2020 Jul;307:123192.
PMID: 32220819 DOI: 10.1016/j.biortech.2020.123192

Abstract

This study investigated the interactions between volatile and char during biomass pyrolysis at 400 °C, employing a β-5 lignin dimer and amino-modified graphitized carbon nanotube (CNT-NH2) as their models, respectively. The results demonstrated that both -NH2 and its carrier (CNT) facilitated the conversion of the β-5 dimer, which significantly increased from 9.7% (blank run), to 61.6% (with CNT), and to 96.6% (with CNT-NH2). CNT mainly favored the breakage of C-O bond in the feedstock to produce dimers with a yield of 55.5%, while CNT-NH2 promoted the cleavage of both C-O and C-C bonds to yield monomers with a yield up to 63.4%. Such significant changes in the pyrolysis behaviors of the β-5 lignin dimer after the introduction of CNT-NH2 were considered to be mainly caused by hydrogen-bond formations between -NH2 and the dimeric feedstock/products, in addition to the π-π stacking between CNT and aromatic rings.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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