lnu.sePublications
Change search
Refine search result
1 - 11 of 11
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Einvall, Jessica
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Parsland, Charlotte
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Benito, Patricia
    University of Bologna.
    Basile, Francesco
    University of Bologna.
    Brandin, Jan
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    High temperature water-gas shift step in the production of clean hydrogen rich synthesis gas from gasified biomass2011In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 35, no Supplement 1, p. S123-S131Article in journal (Refereed)
    Abstract [en]

    The possibility of using the water-gas shift (WGS) step for tuning the H2/CO-ratio in synthesis gas produced from gasified biomass has been investigated in the CHRISGAS (Clean Hydrogen Rich Synthesis Gas) project. The synthesis gas produced will contain contaminants such as H2S, NH3 and chloride components. As the most promising candidate FeCr catalyst, prepared in the laboratory, was tested. One part of the work was conducted in a laboratory set up with simulated gases and another part in real gases in the 100 kW Circulating Fluidized Bed (CFB) gasifier at Delft University of Technology. Used catalysts from both tests have been characterized by XRD and N2 adsoption/desorption at −196 °C.

    In the first part of the laboratory investigation a laboratory set up was built. The main gas mixture consisted of CO, CO2, H2, H2O and N2 with the possibility to add gas or water-soluble contaminants, like H2S, NH3 and HCl, in low concentration (0–3 dm3 m−3). The set up can be operated up to 2 MPa pressure at 200–600 °C and run un-attendant for 100 h or more. For the second part of the work a catalytic probe was developed that allowed exposure of the catalyst by inserting the probe into the flowing gas from gasified biomass.

    The catalyst deactivates by two different causes. The initial deactivation is caused by the growth of the crystals in the active phase (magnetite) and the higher crystallinity the lower specific surface area. The second deactivation is caused by the presence of catalytic poisons in the gas, such as H2S, NH3 and chloride that block the active surface.

    The catalyst subjected to sulphur poisoning shows decreased but stable activity. The activity shows strong decrease for the ammonia and HCl poisoned catalysts. It seems important to investigate the levels of these compounds before putting a FeCr based shift step in industrial operation. The activity also decreased after the catalysts had been exposed to gas from gasified biomass. The exposed catalysts are not re-activated by time on stream in the laboratory set up, which indicates that the decrease in CO2-ratio must be attributed to irreversible poisoning from compounds present in the gas from the gasifier.

    It is most likely that the FeCr catalyst is suitable to be used in a high temperature shift step, for industrial production of synthesis gas from gasified biomass if sulphur is the only poison needed to be taken into account. The ammonia should be decomposed in the previous catalytic reformer step but the levels of volatile chloride in the gas at the shift step position are not known.

  • 2.
    Hosseinpourpia, Reza
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Adamopoulos, Stergios
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Parsland, Charlotte
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Utilization of different tall oils for improving the water resistance of cellulosic fibers2019In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 136, no 13, article id 47303Article in journal (Refereed)
    Abstract [en]

    This study was conducted to assess the effect of the pulping by-products crude tall oil (CTO), distilled tall oil (DTO), andtall oil fatty acid (TOFA) on dynamic water vapor sorption behavior, interfiber strength, and thermal stability of cellulosic paper-sheets.The results were compared against those obtained in cellulose papers treated with the conventional petroleum-derived hydrophobicagent hydrowax and in untreated ones. The tall oil treatments caused strong reduction in equilibrium moisture content of the paper-sheets during adsorption and desorption runs. The same trend was noticed for the hydrowax-treated papers, however, it was lesspronounced than the CTO-treated and DTO-treated samples in the relative humidity range of 75–95%. The sorption hysteresis was con-siderably decreased after the treatments. The ultimate dry-tensile strengths of the paper-sheets were significantly reduced by TOFA andhydrowax treatments, while CTO and DTO showed comparable strength as that of untreated control. The ultimate wet-strengths of thepaper-sheets were improved after the treatments. The thermal stability of the specimens was improved by the tall oil treatments, and thehydrowax-treated samples illustrated lower degradation temperature than the untreated control. The results are promising for the use oftall oils as alternative hydrophobic agents of cellulosicfiber-based products, such as wood panels and paper packaging.

  • 3.
    Parsland, Charlotte
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Study of the activity of catalysts for the production of high quality biomass gasification gas: with emphasis on Ni-substituted Ba-hexaaluminates2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The fossil hydrocarbons are not inexhaustible, and their use is not without impact in our need of energy, fuels and hydrocarbons as building blocks for organic materials. The quest for renewable, environmentally more friendly technologies are in need and woody biomass is a promising candidate, well provided in the boreal parts of the world. To convert the constituents of wood into valuable gaseous products, suitable for the end use required, we need a reliable gasification technology. But to become an industrial application on full scale there are still a few issues to take into account since the presence of contaminants in the process gas will pose several issues, both technical and operational, for instance by corrosion, fouling and catalyst deactivation. Furthermore the downstream applications may have very stringent needs for syngas cleanliness depending on its use. Therefore, the levels of contaminants must be decreased by gas cleanup to fulfil the requirements of the downstream applications.

    One of the most prominent problems in biomass gasification is the formation of tars – an organic byproduct in the degradation of larger hydrocarbons. So, tar degrading catalysts are needed in order to avoid tar related operational problems such as fouling but also reduced conversion efficiency. Deactivation of catalysts is generally inevitable, but the process may be slowed or even prevented. Catalysts are often very sensitive to poisonous compounds in the process gas, but also to the harsh conditions in the gasifier, risking problems as coke formation and attrition. Alongside with having to be resistant to any physical and chemical damage, the catalyst also needs to have high selectivity and conversion rate, which would result in a more or less tar-free gas. Commercial tar reforming catalysts of today often contain nickel as the active element, but also often display a moderate to rapid deactivation due to the causes mentioned.

  • 4.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Brandin, Jan
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Nickel-substituted Ba-hexaaluminates as catalysts stem-reforming of tars2013In: CRS-2, Catalysis for Renewable sources: Fuel. Energy, Chemicals Book of Abstracts / [ed] Vadim Yakovlev, Boreskov Institute of Catalysis, Novosibirsk: Boreskov Institute of Catalysis , 2013, p. 62-63Conference paper (Refereed)
    Abstract [en]

    Gasification of woody biomass converts the solid organic material into a gaseous product with a higher energy value and by this mean provide a more carbon neutral gaseous fuel than the common fossil ones. The produced raw gas mainly contains H2, CO, CO2, CH4, H2O and N2 together with organic (tars) and inorganic (alkali) components and fine particulates. The amount of impurities in the raw gas is dependent of the fuel properties and the gasification process technology and the quality of the resulting product gas determines its suitability for more advanced purposes. One of the major general concerns within the gasification processes is the formation of tars. Tars are a vast group of polyaromatic hydrocarbons and there are a number of definitions. On an EU/IEA/US-DOE discussion meeting in Brussels 1998, a number of experts agreed on a simplified classification of tars as “all organic contaminants with a molecular weight larger than benzene” [1]. The aim of this work is to investigate the steam reforming ability of a catalytic material not previously tested in this type of application in order to achieve an energy-efficient and high-quality gasification gas. The physical demands for an optimal tar-cracking and steam reforming catalyst is a high surface area, thermal stability, mechanical strength and a capacity to withstand high gas velocities, poisons such as H2S or NH3 and other impurities. Additionally it has to resist the process steam, as steam is well known to enhance sintering of porous materials. Nickel is a familiar catalyst for steam reforming. Hexaaluminate is a well-known catalyst support with properties that may answer to the requests of a non-abrasive, high-temperaturestable and steam-resistant catalytic material. It is a structural oxide where the general formula for the doped unit cell is MIMII(x)Al12-xO19-d where MI represents the mirror plane cation and MII is the aluminum site in the lattice where substitution may occur. MII is often a transition metal ion of the same size and charge as aluminum. MI is an ion located in the mirror plane of the structure and it is a large metal ion, often from the alkaline, alkaline earth or rare earth metal group. The stability and activity of these materials are often being related to the properties of MI and MII. The activity is highly dependent on the nature of the Al-substituted metal and partially by the nature of MII [2]. In our experiments we have tested the catalytic capacity of Ni-substituted Ba-hexaaluminates synthesised by the sol-gel method [3], both in a model set-up and in a gasification plant. In the lab-scale set-up different catalyst-formulae was tested under various temperatures for reforming of methyl-naphthalene. The results show a good catalytic activity for tar-breakdown. As expected the substitution level of Ni is clearly coupled to the reaction temperature. With the most highly substituted Ni-Bahexaaluminate at 900 °C all of the methyl-naphthalene has been broken downtogether with all of the resulting hydrocarbons. The Ni-Bahexaaluminate catalyst has recently also been tested in real process-gas.

    These results are still to be evaluated, but indicate a positive result.

     

     

  • 5.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Brandin, Jan
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Nickel-substituted Barium-hexaaluminates as Catalysts in the Steam-reforming of Tars2012In: 20th European Biomass Conference and Exhibition: "Setting the course for a biobased economy" / [ed] B Krautkremer, 2012Conference paper (Other academic)
    Abstract [en]

    The aim of this work is to investigate the catalytic properties, i.e. activity, selectivity and stability of nickel‐substituted Ba‐hexaaluminates for the cracking and steam‐reforming of a tar in product gas from biomass gasification. A lab‐scale set‐up has been constructed, consisting of a quartz reactor placed in a vertical oven, filled with the catalyst bed material. Methyl‐naphthalene was chosen as a tar model substance since naphthalene is considered to be especially difficult to reform, and since it is in liquid form at room temperature it is easier to handle than the solid naphthalene. A gas stream containing nitrogen gas, steam and methyl‐naphthalene was passed through the reactor and the resulting gas was analyzed by GC‐FID and GC‐TCD. Different catalyst compositions have been tested at different temperatures. The activity, stability and the product distribution was investigated as function of the temperature for the Ni‐substituted catalysts. In this study, three catalysts with different Ni‐substitution levels were used; BaNiAl11O19, BaNi1.5Al10.5O19and BaNi2Al10O19.

    The physical demands for an optimal cracking and steam reforming catalyst is a high surface area, thermal stability, abrasion resistance, and a capacity to withstand high gas velocities. Additionally it has to resist the process steam, as steam is well known to enhance sintering of porous materials. Hexaaluminate is a well

    ‐known high‐temperature material with properties that may well answer to these requests. If it can be substituted to a high catalytic activity this material may well be a good candidate for steam reforming. Our results show that we have synthesized a material with the desired composition and structure. The activity tests show that we have a good reforming ability from all the catalytic materials, but with an increased activity for BaNi2Al10O19. At 1000°C all methyl‐naphthalene was decomposed in all three cases and also at 900°C for the BaNi2Al10O19. There was no char deposition in the catalyst bed and the pore size distribution was unaffected after approximately 50h on stream.

    In our continuing studies we will use synthesis gas instead of nitrogen and we will also examine the effect of catalyst poisons like hydrogen sulfide and chlorine.The synthesized BaNi‐hexaaluminates has proven to be very interesting candidates for a new, more resistant steam reforming catalyst in the aim of producing synthesis gas of a high quality.

  • 6.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Brandin, Jan
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Benito, Patricia
    University of Bologna, Italy.
    Hoang Ho, Phuoc
    University of Bologna, Italy.
    Fornasari, Guiseppe
    University of Bologna, Italy.
    Ni-substituted Ba-hexaaluminate as a new catalytic material in steam reforming of tars2017In: Europacat: 13th European Conference on Catalysis, 27-31 August 2017, Florence Italy, 2017Conference paper (Refereed)
  • 7.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Einvall, Jessica
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Brandin, Jan
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Scale-up and Assessment of Water Gas Shifts2010Report (Other academic)
    Abstract [en]

    Synthesis gas consists of a mixture between hydrogen, carbon monoxide, carbon dioxide and water. This gas is normally generated by gasification of a carbon containing fuel, to be used as a feedstock for various synthesis processes. The actual composition of the gas depends on many different factors such as type of fuel, type of gasifier, mode of operation of the gasifier etc. The producer gas, i.e. the gas after the gasification step, usually need upgrading since it contains lower hydrocarbons and tars that needs to be converted. This upgrading, from producer gas into synthesis gas is done in the reformer step. The resulting synthesis gas is not necessarily suited for the subsequent synthesis step; it might need to be processed further. For instance the carbon dioxide level might need to be decreased and/or the hydrogen-carbon dioxide ratio to be adjusted. The water gas shift (WGS) process is the process where the ratio between hydrogen and carbon monoxide in the synthesis gas can be tuned.

  • 8.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Einvall, Jessica
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Brandin, Jan
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Benito, Patricia
    Dipartimento di Chimica Industriale e dei Materiali, Bologna University, Italy.
    Albertazzi, Simone
    Dipartimento di Chimica Industriale e dei Materiali, Bologna University, Italy.
    Basile, Francesco
    Dipartimento di Chimica Industriale e dei Materiali, Bologna University, Italy.
    Trifiró, Ferruccio
    Dipartimento di Chimica Industriale e dei Materiali, Bologna University, Italy.
    Siedlecki, Marcin
    Delft University of Technology, Process&Energy Department, the Netherlands.
    de Jong, Wiebren
    Delft University of Technology, Process&Energy Department, the Netherlands.
    Effect on Catalytic Activity and Stability of the Gas Coming from a Gasifier2010Report (Other academic)
    Abstract [en]

    This deliverable contains both laboratory experiments and experiments where the watergas-shift catalyst has been exposed to gas and particles generated by biomass gasification.The gasification experiments took place in the 100 kWth CFB gasifier at Delft University of Technology in Delft in July 2008 and in February and August 2009.

  • 9.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Larsson, Ann-Charlotte
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Benito, Patricia
    University of Bologna, Italy.
    Fornasari, Guiseppe
    University of Bologna, Italy.
    Brandin, Jan
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Nickel-substituted bariumhexaaluminates as novel catalysts in steam reforming of tars2015In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 140, p. 1-11Article in journal (Refereed)
    Abstract [en]

    This work investigates the performance of Ba–Ni-hexaaluminate, BaNixAl12 − xO19, as a new catalyst in thesteam-reforming of tars. Substituted hexaaluminates are synthesized and characterized. Steam reforming testsare carried out with both a model-substance (1-methylnaphthalene) and a slip-stream from a circulatingfluidized bed gasifier. The water–gas-shift activity is studied in a lab-scale set-up. Barium–nickel substitutedhexaaluminates show a high catalytic activity for tar cracking, and also shows activity for water–gas-shift.

  • 10.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Larsson, Ann-Charlotte
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Brandin, Jan
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Ni-substituted Ba-hexaaluminates catalyst for tar reforming from gasified iomass2016In: Proceedings of the 17th Nordic Symposium on Catalysis: Book of Abstracts / [ed] Ingemar Odenbrand, Christian Hulteberg, 2016, p. 256-257Conference paper (Refereed)
  • 11.
    Parsland, Charlotte
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Strand, Michael
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Catalytic Cracking of Biomass Tars: a Model-Study of Naphtalene Cracking with Mineral Based Catalysts2010In: 18th European Biomass Conference & Exhibition: From Research to Industry and Market, ETA Renewable Energies and WIP Renewable Energies , 2010Conference paper (Refereed)
    Abstract [en]

    In the production of syngas from biomass gasification the resulting raw gas needs to be low in both tar and particulates but also optimized in its composition. Different bed materials have been studied in the purpose of catalytically reducing tars. The set-up has been in lab-scale and naphtalene has been used as a model substance. One problem that can occur when using porous and active bed materials is abrasion of the solids which causes formation of fine particles that can not be recirculated in the process cyclone. Other limiting factors are poor catalytic effectiveness and high costs for the new materials. The objective of this study is to investigate potentially cost-efficient, mechanically stable and catalytically active bed-materials.

1 - 11 of 11
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf