Py-GC/MS study of prot lignin with cobalt impregnated titania, ceria and zirconia catalysts

Avnish Kumar, Bijoy Biswas, Komal Saini, Adarsh Kumar, Jitendra Kumar, Bhavya B. Krishna and Thallada Bhaskar

Renewable Energy, 2021, vol. 172, issue C, 121-129

Abstract: In the present study, pyrolysis–gas chromatography and mass spectrometry (Py–GC/MS) analysis were employed to characterize the structure and composition of evolving gas while using prot lignin as feedstock. Non-catalytic and catalytic (Co/TiO2, Co/CeO2 and Co/ZrO2) pyrolysis were performed at 300, 400, 500 and 600 °C. The pyrolysis products were grouped as phenolics (S, G and H-type), heterocyclic, other type, aromatic hydrocarbon and aliphatic hydrocarbon. Among all the catalysts, Co/CeO2 effectively promoted the formation of S-type phenolics (30.8%) at 300 °C from the depolymerization of lignin, and showed maximum selectivity towards ethanone, 1-(2-hydroxy-5-methylphenyl) (26.3%) and acetosyringone (13.5%) at 300 °C. Maximum amount of H-type phenolics (49.7%) was observed in the presence of Co/TiO2 catalyst at 600 °C. In another set of experiments, non-catalytic and catalytic (Co/CeO2) hydropyrolysis of lignin were also investigated using 1, 5, 10 and 15 bar pressure of hydrogen at 300 °C. At 1 bar H2 pressure, Co/CeO2 catalyst effectively led to the production of maximum amount of aromatic hydrocarbon (46.8%) from the hydropyrolysis of lignin, while, 23.9% of aromatic hydrocarbon was obtained from the non-catalytic hydropyrolysis of lignin.

Keywords: Py-GC/MS; Pyrolysis; Prot lignin; Metal oxide; Phenolics (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:172:y:2021:i:c:p:121-129

DOI: 10.1016/j.renene.2021.03.011

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