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Title: Molecular Weight Distribution of Raw and Catalytic Fast Pyrolysis Oils: Comparison of Analytical Methodologies

Abstract

Comprehensive analysis of the molecular weight distribution of raw and catalytic fast pyrolysis oils derived from biomass remains a key technical hurdle to understanding oil quality as it relates to downstream use and multiple methods may be necessary to accurately represent all components present. Here, we report the molecular weight distribution metrics of fast pyrolysis (FP) and catalytic fast pyrolysis (CFP) oils as determined by gel permeation chromatography (GPC) combined with UV-diode array (UV), differential refractive index (RI), and multi-angle laser light scattering (MALS) detection. The measured molar mass distributions revealed that FP oil consisted of a higher proportion of larger products relative to the low molecular weight products contained in the CFP oil. GPC/RI and UV methods showed FP oil to have higher weight-average molecular weight (Mw) and number-average molecular weight (Mn) than CFP oil based on elution time. However, GPC/MALS, determined the two oils to have similar overall molecular weight distribution metrics (Mw and Mn) and yielded values significantly higher than those determined by RI and UV detectors relative to external standards. Overall, the use of a multiple detection GPC method could enable a more accurate comparison and determination of true molecular weight metrics of bio-oils.

Authors:
 [1];  [1];  [2];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Wyatt Technology Corporation
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1598125
Report Number(s):
NREL/JA-5100-75507
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 10; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; pyrolysis; catalysis; molecular weight; gel permeation chromatography; light 12 scattering; CCTPL

Citation Formats

Ware, Anne E, Orton, Kellene A, Deng, Chris, Kenrick, Sophia, Carpenter, Daniel L, and Ferrell, Jack R. Molecular Weight Distribution of Raw and Catalytic Fast Pyrolysis Oils: Comparison of Analytical Methodologies. United States: N. p., 2020. Web. doi:10.1039/C9RA09726K.
Ware, Anne E, Orton, Kellene A, Deng, Chris, Kenrick, Sophia, Carpenter, Daniel L, & Ferrell, Jack R. Molecular Weight Distribution of Raw and Catalytic Fast Pyrolysis Oils: Comparison of Analytical Methodologies. United States. doi:10.1039/C9RA09726K.
Ware, Anne E, Orton, Kellene A, Deng, Chris, Kenrick, Sophia, Carpenter, Daniel L, and Ferrell, Jack R. Wed . "Molecular Weight Distribution of Raw and Catalytic Fast Pyrolysis Oils: Comparison of Analytical Methodologies". United States. doi:10.1039/C9RA09726K.
@article{osti_1598125,
title = {Molecular Weight Distribution of Raw and Catalytic Fast Pyrolysis Oils: Comparison of Analytical Methodologies},
author = {Ware, Anne E and Orton, Kellene A and Deng, Chris and Kenrick, Sophia and Carpenter, Daniel L and Ferrell, Jack R},
abstractNote = {Comprehensive analysis of the molecular weight distribution of raw and catalytic fast pyrolysis oils derived from biomass remains a key technical hurdle to understanding oil quality as it relates to downstream use and multiple methods may be necessary to accurately represent all components present. Here, we report the molecular weight distribution metrics of fast pyrolysis (FP) and catalytic fast pyrolysis (CFP) oils as determined by gel permeation chromatography (GPC) combined with UV-diode array (UV), differential refractive index (RI), and multi-angle laser light scattering (MALS) detection. The measured molar mass distributions revealed that FP oil consisted of a higher proportion of larger products relative to the low molecular weight products contained in the CFP oil. GPC/RI and UV methods showed FP oil to have higher weight-average molecular weight (Mw) and number-average molecular weight (Mn) than CFP oil based on elution time. However, GPC/MALS, determined the two oils to have similar overall molecular weight distribution metrics (Mw and Mn) and yielded values significantly higher than those determined by RI and UV detectors relative to external standards. Overall, the use of a multiple detection GPC method could enable a more accurate comparison and determination of true molecular weight metrics of bio-oils.},
doi = {10.1039/C9RA09726K},
journal = {RSC Advances},
number = 7,
volume = 10,
place = {United States},
year = {2020},
month = {1}
}

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