Hydrogen donation of bio-acids over transition metal facets: A Density Functional Theory study

Abstract

Bio-acids produced from biomass fast pyrolysis are regarded as alternative hydrogen source for upgrading bio-oil into transport fuels. In this work, the hydrogen donation performance of acetic acid (AcOH) and formic acid (FA) were evaluated over the transition metal facet in comparison with H2 gas, using Density Functional Theory (DFT) modelling. It was revealed that Mo (110) led to stronger binding with the bio-acid molecule than other base transition metals, and the consequent electrons migration significantly facilitated the bio-acids decomposition. AcOH exhibited a greater potential than FA as a hydrogen donor over Mo (110) because it released more H atoms with low energy barriers. H2 gas showed undoubtable merits of dissociative adsorption with negligible energy barrier over Mo (110). However, the larger enthalpy changes from the exothermic decomposition of bio-acids would probably more facilitate the activation and migration of the individual H atoms for their donation compared to H2 gas.

Publication DOI: https://doi.org/10.1016/j.apcata.2019.117218
Divisions: Engineering & Applied Sciences > European Bioenergy Research Institute (EBRI)
Engineering & Applied Sciences > Chemical Engineering & Applied Chemistry
Additional Information: © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Funding: Leverhulme Trust Research Grant (RPG-2017-254) and EPSRC First Grant (EP/R010986/1). The authors are also grateful for computational support from the UK Materials and Molecular Modelling Hub, which is partially funded by EPSRC (EP/P020194), for which access was obtained via the UKCP consortium and funded by EPSRC grant ref EP/P022561/1.
Uncontrolled Keywords: Catalytic decomposition,DFT modelling,Hydrodeoxygenation,Hydrogen donor compounds,Transition metals,Catalysis,Process Chemistry and Technology
Full Text Link:
Related URLs: https://linking ... 926860X19303734 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2019-09-25
Published Online Date: 2019-08-26
Accepted Date: 2019-08-25
Authors: Zhang, Jiajun
Zhang, Xiaolei
Osatiashtiani, Amin ( 0000-0003-1334-127X)
Bridgwater, Anthony ( 0000-0001-7362-6205)

Download

[img]

Version: Accepted Version

Access Restriction: Restricted to Repository staff only until 26 August 2020.

License: Creative Commons Attribution Non-commercial No Derivatives


Export / Share Citation


Statistics

Additional statistics for this record