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Synthetic biofuels by molten salt-catalytic conversion - Corrosion of structural materials in ternary molten chlorides

Bonk, Alexander and Hanke, Andrea and Braun, Markus and Ding, Wenjin and Bauer, Thomas (2021) Synthetic biofuels by molten salt-catalytic conversion - Corrosion of structural materials in ternary molten chlorides. Advanced Engineering Materials. Wiley. doi: 10.1002/adem.202101453. ISSN 1438-1656.

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Abstract

The molten-salt catalytic conversion of biomass into synthetic fuels is one of the promising renewable energy topics of the 21st century. Mixtures of Zn-Na-K//Cl have gained attention, acting as catalytically active heat transfer fluids in the conversion process, due to their low costs and principally low melting points which effectively lower the required operating temperature in the catalytic reactor. Herein, the corrosion behavior of three candidate steels, SS316L, SS321, and Alloy 800, in the pure molten salt, in a salt-biomass mix, and in a salt-biomass mix containing a corrosion inhibitor (zinc oxide (ZnO)) is comprehensively investigated. The herein described study demonstrates that biomass additions increase the penetration depth of the salt, and the corrosion mechanism leads to partial spalling of the oxide scale. This is attributed to the presence of oxygen and moisture from the biomass leading to the formation of reactive HCl gas. The addition of ZnO reduced the corrosivity of the molten salt-biomass mix, and all alloys obtained a protective, adherent, and thin oxide scale leading to the conclusion that ZnO indeed is an effective corrosion inhibitor for the presented salt system. These findings constitute a major advance in the implementation of molten salt-catalytic reactors for renewable synthetic fuel production.

Item URL in elib:https://elib.dlr.de/147869/
Document Type:Article
Title:Synthetic biofuels by molten salt-catalytic conversion - Corrosion of structural materials in ternary molten chlorides
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Hanke, AndreaAndrea.Hanke (at) dlr.deUNSPECIFIED
Braun, Markusmar.braun (at) dlr.deUNSPECIFIED
Ding, WenjinWenjin.Ding (at) dlr.dehttps://orcid.org/0000-0001-5037-5810
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:2021
Journal or Publication Title:Advanced Engineering Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/adem.202101453
Publisher:Wiley
ISSN:1438-1656
Status:Published
Keywords:Biomass Conversion, Synthetic Fuels, Molten Salt, Corrosion, Corrosion inhibitor
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bonk, Alexander
Deposited On:14 Mar 2022 15:37
Last Modified:14 Mar 2022 15:37

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