Browsing Department of Chemistry by Author "Barth, Tanja"
Now showing items 1-17 of 17
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Catalytic oxidation and reduction of polycyclic aromatic hydrocarbons (PAHs) present as mixtures in hydrothermal media
Nkansah, Marian Asantewah; Christy, Alfred A.; Barth, Tanja; Francis, George William (Peer reviewed; Journal article, 2012)The reactivity of fluorene, anthracene and fluoranthene under oxidation and reduction conditions has been investigated in this study. This project looks at catalytic and green approaches of converting PAH to less toxic ... -
Comparison of calibration models for rapid prediction of lignin content in lignocellulosic biomass based on infrared and near-infrared spectroscopy
Herdlevær, Kristoffer Mega; Løhre, Camilla; Nodland, Egil; Barth, Tanja (Journal article; Peer reviewed, 2022)Lignocellulosic biomass has great potential as a renewable energy source due to abundance both as vegetation and in residues from agriculture and forestry. It can be utilized for biofuels and for value-added chemicals and ... -
Composition of Lignin-to-Liquid Solvolysis Oils from Lignin Extracted in a Semi-Continuous Organosolv Process
Løhre, Camilla; Halleraker, Hilde Vik; Barth, Tanja (Peer reviewed; Journal article, 2017-01-23)The interest and on-going research on utilisation of lignin as feedstock for production of renewable and sustainable aromatics is expanding and shows great potential. This study investigates the applicability of semi-continuously ... -
The Consistency of Yields and Chemical Composition of HTL Bio-Oils from Lignins Produced by Different Preprocessing Technologies
Halleraker, Hilde Vik; Kalogiannis, Konstantinos; Lappas, Angelos; Castro, Rafael C. A.; Roberto, Ines C.; Mussatto, Solange I.; Barth, Tanja (Journal article; Peer reviewed, 2022-06-27)This work evaluates the effect of feedstock type and composition on the conversion of lignin to liquid by solvolysis with formic acid as hydrogen donor (LtL), by analyzing the yields and molecular composition of the liquid ... -
Data on pigments and long-chain fatty compounds identified in Dietzia sp. A14101 grown on simple and complex hydrocarbons
Hvidsten, Ina; Mjøs, Svein Are; Bødtker, Gunhild; Barth, Tanja (Peer reviewed; Journal article, 2015-09)This data article provides: 1. An overview of tentatively identified long chain compounds in Dietzia sp. A14101 grown on simple and complex hydrocarbons; 2. Preliminary Identification of pigments in bacterial material ... -
Effect of Reaction Conditions on Catalytic and Noncatalytic Lignin Solvolysis in Water Media Investigated for a 5 L Reactor
Ghoreishi, Solmaz; Barth, Tanja; Hermundsgård, Dag Helge (Peer reviewed; Journal article, 2019)The high content of oxygen in the lignin polymer and the prevalence of phenolic functional groups make the conversion of lignin to fuels and value-added products with well-defined chemical properties challenging. The ... -
Energetic and Exergetic Performances of a Retrofitted, Large-Scale, Biomass-Fired CHP Coupled to a Steam-Explosion Biomass Upgrading Plant, a Biorefinery Process and a High-Temperature Heat Network
De Meulenaere, Roeland; Maertens, Tim; Sikkema, Ale; Brusletto, Rune; Barth, Tanja; Blondeau, Julien (Journal article; Peer reviewed, 2021)This paper aims at assessing the impact of retrofitting an existing, 730 MWe, coal-fired power plant into a biomass-fired combined heat and power (CHP) plant on its energetic and exergetic performances. A comprehensive ... -
Exploring hydrothermal liquefaction (HTL) of digested sewage sludge (DSS) at 5.3 L and 0.025 L bench scale using experimental design
Hegdahl, Stian Hersvik; Ghoreishi, Solmaz; Løhre, Camilla; Barth, Tanja (Journal article; Peer reviewed, 2023)A common perspective within the prospect of a greener future is utilising our waste materials. One waste material of which the world has abundant resources, and where we will keep having resources, is sewage sludge. This ... -
Formic acid assisted liquefaction of lignin in water and ethanol, investigated for a 0.025 and a 5 L batch reactor: Comparison of yields and compositions of the products
Ghoreishi, Solmaz; Barth, Tanja; Derribsa, Hailegebrel (Peer reviewed; Journal article, 2019)Formic acid assisted conversion of lignin to liquids (LtL-process), where lignin is hydrodeoxygenated in a one-step conversion, produces bio-oils with a molecular weight range of 300–600 Da that comprise a complex mixture ... -
Hydrothermal liquefaction of sewage sludge anaerobic digestate for bio-oil production: Screening the effects of temperature, residence time and KOH catalyst
Hegdahl, Stian Hersvik; Løhre, Camilla; Barth, Tanja (Journal article; Peer reviewed, 2022)Due to sewage sludge being an abundant biobased resource, and with the number of biogas plants utilizing sewage sludge increasing, digested sewage sludge (DSS) is a promising feedstock for producing bio-oil. This study ... -
Identification and quantification of valuable platform chemicals in aqueous product streams from a preliminary study of a large pilot-scale steam explosion of woody biomass using quantitative nuclear magnetic resonance spectroscopy
Ghoreishi, Solmaz; Løhre, Camilla; Hermundsgård, Dag Helge; Molnes, Joakim Lindgaard; Tanase-Opedal, Mihaela; Brusletto, Rune; Barth, Tanja (Journal article; Peer reviewed, 2022)Steam explosion breaks down the polymeric matrix and enables the recovery of valuable compounds from lignocellulosic feedstock. In the steam explosion process, biomass is treated with high-pressure steam which subsequently ... -
Investigating solids present in the aqueous stream during STEX condensate upgrading—a case study
Hermundsgård, Dag Helge; Ghoreishi, Solmaz; Opedal, Mihaela Tanase; Brusletto, Rune; Barth, Tanja (Journal article; Peer reviewed, 2022)Steam explosion (STEX) of woody biomass is an efficient pretreatment method in the production of water-resistant wood pellets. The STEX process also generates an aqueous condensate stream containing dissolved organic ... -
Multiscale investigation of CO2 hydrate self-sealing potential for carbon geo-sequestration
Gauteplass, Jarand; Almenningen, Stian; Ersland, Geir; Barth, Tanja; Yang, Jinhai; Chapoy, Antonin (Peer reviewed; Journal article, 2020)Storage of liquid CO2 in shallow geological formations is a recently proposed concept that can facilitate increased storage capacity and improved mobility control. If stored below the gas hydrate stability zone (GHSZ), ... -
Optimizing Formic Acid-Assisted Co-HTL of Digested Sewage Sludge and Lignocellulosic Waste for Enhanced Bio-Crude Yield and Energy Recovery
Herdlevær, Kristoffer Mega; Barth, Tanja (Journal article; Peer reviewed, 2024)In recent years, hydrothermal liquefaction (HTL) has gained attention as a means of enhancing and increasing the production of biofuels from biomass. Co-HTL involves the simultaneous processing of two or more feedstocks, ... -
Quantitative NMR analysis of the aqueous phase from hydrothermal liquefaction of lignin
Halleraker, Hilde Vik; Barth, Tanja (Journal article; Peer reviewed, 2020-08-06)Hydrothermal liquefaction (HTL) of biomass such as lignin could contribute to finding replacements for petroleum, both as a fuel and production of chemicals. The organic phase produced in formic acid assisted HTL of lignin ... -
Stirred and non-stirred lignin solvolysis with formic acid in aqueous and ethanolic solvent systems at different levels of loading in a 5-L reactor
Ghoreishi, Solmaz; Barth, Tanja; Derribsa, Hailegebrel (Peer reviewed; Journal article, 2019)Lignin polymer is biologically and chemically stable and requires highly vigorous conditions for de-polymerization, and subsequent stabilization of the monomeric conversion products to prevent re-polymerization and char ... -
A Workup Protocol Combined with Direct Application of Quantitative Nuclear Magnetic Resonance Spectroscopy of Aqueous Samples from Large-Scale Steam Explosion of Biomass
Løhre, Camilla; Underhaug, Jarl; Brusletto, Rune; Barth, Tanja (Journal article; Peer reviewed, 2021)Methods for thermochemical conversion of biomass into renewable energy and materials rapidly increase in range and outreach. A focus on the target product streams for valorization is natural, yet several pretreatment steps ...