The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Ayse Eren Putun - One of the best experts on this subject based on the ideXlab platform.
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Synthetic Fuel Production from cottonseed: Fast pyrolysis and a TGA/FT-IR/MS study
Journal of Analytical and Applied Pyrolysis, 2014Co-Authors: Esin Apaydin-varol, Basak Burcu Uzun, Eylem Onal, Ayse Eren PutunAbstract:Abstract This study investigates the thermal decomposition behavior of cottonseed via TGA/FT-IR/MS and the quantification/characterization of liquid products from fast pyrolysis. Thermal degradation of the biomass sample has occurred in four steps, corresponding to the removal of moisture, decomposition of cellulose, hemicellulose and lignin and it was completed at about 700 °C. The main gaseous products evolved were CO2, light hydrocarbons and H2O. For the fast pyrolysis experiments, particular investigated process variables were temperature (400–700 °C), heating rate (5–700 °C min−1) and nitrogen gas flow rate (100–800 cm3 min−1). Maximum oil yield was attained at 500 °C with a yield of 49.5% under 200 cm3 min−1 nitrogen flow rate and at a heating rate of 300 °C min−1. Bio-oil obtained at optimum conditions are separated into its fractions by column chromatography. The oil and its sub-fractions were characterized by elemental analysis, FT-IR, and GC/MS. The char was characterized with elemental analysis and FT-IR techniques. The aliphatic sub-fraction of the obtained bio-oil contains predominantly straight chain of n-alkanes and alkenes. According to the chemical characterization, the bio-oil can be utilized as conventional liquid Fuels.
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Synthetic Fuel Production from cottonseed fast pyrolysis and a tga ft ir ms study
Journal of Analytical and Applied Pyrolysis, 2014Co-Authors: Esin Apaydinvarol, Basak Burcu Uzun, Eylem Onal, Ayse Eren PutunAbstract:Abstract This study investigates the thermal decomposition behavior of cottonseed via TGA/FT-IR/MS and the quantification/characterization of liquid products from fast pyrolysis. Thermal degradation of the biomass sample has occurred in four steps, corresponding to the removal of moisture, decomposition of cellulose, hemicellulose and lignin and it was completed at about 700 °C. The main gaseous products evolved were CO2, light hydrocarbons and H2O. For the fast pyrolysis experiments, particular investigated process variables were temperature (400–700 °C), heating rate (5–700 °C min−1) and nitrogen gas flow rate (100–800 cm3 min−1). Maximum oil yield was attained at 500 °C with a yield of 49.5% under 200 cm3 min−1 nitrogen flow rate and at a heating rate of 300 °C min−1. Bio-oil obtained at optimum conditions are separated into its fractions by column chromatography. The oil and its sub-fractions were characterized by elemental analysis, FT-IR, and GC/MS. The char was characterized with elemental analysis and FT-IR techniques. The aliphatic sub-fraction of the obtained bio-oil contains predominantly straight chain of n-alkanes and alkenes. According to the chemical characterization, the bio-oil can be utilized as conventional liquid Fuels.
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Synthetic Fuel Production from tea waste characterisation of bio oil and bio char
Fuel, 2010Co-Authors: Basak Burcu Uzun, Esin Apaydinvarol, Funda Ates, Nurgul Ozbay, Ayse Eren PutunAbstract:Abstract The pyrolysis of tea waste was studied for determining the main characteristics and quantities of liquid and solid products. Particular investigated process variables were temperature (673–973 K), heating rate (5–700 K min −1 ) and nitrogen gas flow rate (200–800 cm 3 min −1 ). The maximum oil and char yields are 30.4 (773 K) and 43.3% (673 K), respectively. The liquid and its aliphatic sub-fraction were characterized by elemental analysis, FT-IR, 1 H NMR, and GC/MS. The char was characterized with elemental analysis, SEM, BET, and FT-IR techniques. The aliphatic sub-fraction of the obtained bio-oil contains predominantly n -alkanes and alkenes, and branched hydrocarbons. According to the experimental results the liquid products can be used as liquid Fuels, whereas the solid product seems to be not suitable for adsorption purposes, due to having low surface areas.
Mogens Bjerg Mogensen - One of the best experts on this subject based on the ideXlab platform.
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hydrogen and Synthetic Fuel Production using pressurized solid oxide electrolysis cells
International Journal of Hydrogen Energy, 2010Co-Authors: Soren Hojgaard Jensen, Sune Dalgaard Ebbesen, Ruth Knibbe, Mogens Bjerg MogensenAbstract:Wind and solar power is troubled by large fluctuations in delivery due to changing weather. The surplus electricity can be used in a Solid Oxide Electrolyzer Cell (SOEC) to split CO2 + H2O into CO + H2 (+O2). The synthesis gas (CO + H2) can subsequently be catalyzed into various types of Synthetic Fuels using a suitable catalyst. As the catalyst operates at elevated pressure the Fuel Production system can be simplified by operating the SOEC at elevated pressure. Here we present the results of a cell test with pressures ranging from 0.4 bar to 10 bar. The cell was tested both as an SOEC and as a Solid Oxide Fuel Cell (SOFC). In agreement with previous reports, the SOFC performance increases with pressure. The SOEC performance, at 750 °C, was found to be weakly affected by the pressure range in this study, however the internal resistance decreased significantly with increasing pressure.
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hydrogen and Synthetic Fuel Production from renewable energy sources
International Journal of Hydrogen Energy, 2007Co-Authors: Soren Hojgaard Jensen, Peter Halvor Larsen, Mogens Bjerg MogensenAbstract:Abstract Wind and solar power are troubled by large fluctuations in delivery due to changing weather. The surplus electricity can be used in a Solid Oxide Electrolyser Cell (SOEC) to split CO 2 + H 2 O into CO + H 2 ( + O 2 ) which can be catalyzed into various types of Synthetic Fuel using a suitable catalyst. H 2 O electrolysis with a new SOEC resulted in a record breaking current density of - 3.6 A / cm 2 at a cell voltage of 1.48 V. Assuming the surplus electricity to cost 3.6 US$/GJ, the H 2 Production price is estimated to 5 US$/GJ equivalent to 30 US$/barrel crude oil or to 0.6 US$/gge (gallon of gasoline equivalent).
Basak Burcu Uzun - One of the best experts on this subject based on the ideXlab platform.
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Synthetic Fuel Production from cottonseed: Fast pyrolysis and a TGA/FT-IR/MS study
Journal of Analytical and Applied Pyrolysis, 2014Co-Authors: Esin Apaydin-varol, Basak Burcu Uzun, Eylem Onal, Ayse Eren PutunAbstract:Abstract This study investigates the thermal decomposition behavior of cottonseed via TGA/FT-IR/MS and the quantification/characterization of liquid products from fast pyrolysis. Thermal degradation of the biomass sample has occurred in four steps, corresponding to the removal of moisture, decomposition of cellulose, hemicellulose and lignin and it was completed at about 700 °C. The main gaseous products evolved were CO2, light hydrocarbons and H2O. For the fast pyrolysis experiments, particular investigated process variables were temperature (400–700 °C), heating rate (5–700 °C min−1) and nitrogen gas flow rate (100–800 cm3 min−1). Maximum oil yield was attained at 500 °C with a yield of 49.5% under 200 cm3 min−1 nitrogen flow rate and at a heating rate of 300 °C min−1. Bio-oil obtained at optimum conditions are separated into its fractions by column chromatography. The oil and its sub-fractions were characterized by elemental analysis, FT-IR, and GC/MS. The char was characterized with elemental analysis and FT-IR techniques. The aliphatic sub-fraction of the obtained bio-oil contains predominantly straight chain of n-alkanes and alkenes. According to the chemical characterization, the bio-oil can be utilized as conventional liquid Fuels.
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Synthetic Fuel Production from cottonseed fast pyrolysis and a tga ft ir ms study
Journal of Analytical and Applied Pyrolysis, 2014Co-Authors: Esin Apaydinvarol, Basak Burcu Uzun, Eylem Onal, Ayse Eren PutunAbstract:Abstract This study investigates the thermal decomposition behavior of cottonseed via TGA/FT-IR/MS and the quantification/characterization of liquid products from fast pyrolysis. Thermal degradation of the biomass sample has occurred in four steps, corresponding to the removal of moisture, decomposition of cellulose, hemicellulose and lignin and it was completed at about 700 °C. The main gaseous products evolved were CO2, light hydrocarbons and H2O. For the fast pyrolysis experiments, particular investigated process variables were temperature (400–700 °C), heating rate (5–700 °C min−1) and nitrogen gas flow rate (100–800 cm3 min−1). Maximum oil yield was attained at 500 °C with a yield of 49.5% under 200 cm3 min−1 nitrogen flow rate and at a heating rate of 300 °C min−1. Bio-oil obtained at optimum conditions are separated into its fractions by column chromatography. The oil and its sub-fractions were characterized by elemental analysis, FT-IR, and GC/MS. The char was characterized with elemental analysis and FT-IR techniques. The aliphatic sub-fraction of the obtained bio-oil contains predominantly straight chain of n-alkanes and alkenes. According to the chemical characterization, the bio-oil can be utilized as conventional liquid Fuels.
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Synthetic Fuel Production from tea waste characterisation of bio oil and bio char
Fuel, 2010Co-Authors: Basak Burcu Uzun, Esin Apaydinvarol, Funda Ates, Nurgul Ozbay, Ayse Eren PutunAbstract:Abstract The pyrolysis of tea waste was studied for determining the main characteristics and quantities of liquid and solid products. Particular investigated process variables were temperature (673–973 K), heating rate (5–700 K min −1 ) and nitrogen gas flow rate (200–800 cm 3 min −1 ). The maximum oil and char yields are 30.4 (773 K) and 43.3% (673 K), respectively. The liquid and its aliphatic sub-fraction were characterized by elemental analysis, FT-IR, 1 H NMR, and GC/MS. The char was characterized with elemental analysis, SEM, BET, and FT-IR techniques. The aliphatic sub-fraction of the obtained bio-oil contains predominantly n -alkanes and alkenes, and branched hydrocarbons. According to the experimental results the liquid products can be used as liquid Fuels, whereas the solid product seems to be not suitable for adsorption purposes, due to having low surface areas.
Stéphane Abanades - One of the best experts on this subject based on the ideXlab platform.
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Solar Thermochemical Green Fuels Production: A Review of Biomass Pyro-Gasification, Solar Reactor Concepts and Modelling Methods
Energies, 2021Co-Authors: Stéphane Abanades, Sylvain Rodat, Houssame BoujjatAbstract:This paper addresses the solar thermochemical conversion of biomass or waste feedstocksbased on pyro-gasification for the clean Production of high-value and energy-intensive Fuels. Theutilization of solar energy for supplying the required process heat is attractive to lower the de-pendence of gasification processes on conventional energy resources and to reduce emissions ofCO2and other pollutants for the Production of high-value chemical Synthetic Fuels (syngas). Usingconcentrated solar energy to drive the endothermal reactions further allows producing more syngaswith a higher gas quality, since it has not been contaminated by combustion products, while savingbiomass resources. The solar-driven process is thus a sustainable and promising alternative route,enabling syngas yield enhancement and CO2mitigation, thereby potentially outperforming theperformance of conventional processes for syngas Production. This review presents relevant researchstudies in the field and provides the scientific/technical knowledge and background necessary toaddress the different aspects of the solar gasification process. An overview of the available solarconcentrating technologies and their performance metrics is first introduced. The solar gasifier con-cepts and designs that were studied from lab to industrial scale are presented, along with their mainbenefits and limitations. The different management strategies proposed to deal with solar energyvariations are also outlined, as well as the major pilot-scale applications and large-scale system levelsimulations. A specific emphasis is provided on the spouted bed technology that appears promising for the gasification process. Finally, the main modeling approaches of pyro-gasification and kinetics for simulation of gasifiers are described. This study thus provides a detailed overview of the efforts made to enhance the thermochemical performance of solar-assisted biomass gasification for Synthetic Fuel Production
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Remarkable performance of microstructured ceria foams for thermochemical splitting of H2O and CO2 in a novel high–temperature solar reactor
Chemical Engineering Research and Design, 2020Co-Authors: Anita Haeussler, Stéphane Abanades, Anne Julbe, Julien Jouannaux, Martin Drobek, Andre Ayral, Bruno CartoixaAbstract:Thermochemical splitting of H 2 O and CO 2 applying redox materials constitutes a sustainable option for Synthetic Fuel Production and CO 2 valorization. It consists of two-step process based on the creation of oxygen vacancies in non-stoichiometric oxides during solar-driven thermal reduction, followed by the material re-oxidation with H 2 O and/or CO 2 to generate syngas (H 2 /CO), the building block for a wide variety of Synthetic hydrocarbon Fuels. In this work, a monolithic solar reactor was designed and tested integrating reticulated porous ceria (open-cell foams) heated by concentrated solar energy. The influence of various operating parameters on the thermochemical reactor performance was investigated. Increasing the temperature or decreasing the pressure in the reduction step was found to enhance the maximum reduction extent reached by the redox material (CeO 2-), thereby improving the Fuel Production capacity. In addition, a decrease of the oxidation temperature led to higher Fuel Production rate, despite an increase of the temperature swing between the reduction and oxidation steps. Increasing the oxidant concentration also sharply enhanced the oxidation rate. Peak CO Production rate approaching 10 mL/min/g was achieved with ceria foams (exhibiting micron-sized grains forming an interconnected macroporous network within the struts) during their reoxidation upon free cooling with pure CO 2 stream (after reduction at 2 1400°C), thus strongly outperforming (by a factor of about x8) the previous maximum values reported to date. This result was attributed to the fine and stable granular microstructure of the reticulated ceria foams. The solar reactor reliability and robustness during high-temperature two-step redox cycling were demonstrated with an average cycle Production of 5.1 mL/g of H 2 and CO, and peak solar-to-Fuel efficiencies above 8%. The highly reactive reticulated foams with 10 and 20 ppi (pore per inch) were cycled for about 69 hours (51 cycles) of continuous on-sun operation without any decrease in performance, thus evidencing their noteworthy thermochemical and microstructural stability.
Soren Hojgaard Jensen - One of the best experts on this subject based on the ideXlab platform.
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hydrogen and Synthetic Fuel Production using pressurized solid oxide electrolysis cells
International Journal of Hydrogen Energy, 2010Co-Authors: Soren Hojgaard Jensen, Sune Dalgaard Ebbesen, Ruth Knibbe, Mogens Bjerg MogensenAbstract:Wind and solar power is troubled by large fluctuations in delivery due to changing weather. The surplus electricity can be used in a Solid Oxide Electrolyzer Cell (SOEC) to split CO2 + H2O into CO + H2 (+O2). The synthesis gas (CO + H2) can subsequently be catalyzed into various types of Synthetic Fuels using a suitable catalyst. As the catalyst operates at elevated pressure the Fuel Production system can be simplified by operating the SOEC at elevated pressure. Here we present the results of a cell test with pressures ranging from 0.4 bar to 10 bar. The cell was tested both as an SOEC and as a Solid Oxide Fuel Cell (SOFC). In agreement with previous reports, the SOFC performance increases with pressure. The SOEC performance, at 750 °C, was found to be weakly affected by the pressure range in this study, however the internal resistance decreased significantly with increasing pressure.
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hydrogen and Synthetic Fuel Production from renewable energy sources
International Journal of Hydrogen Energy, 2007Co-Authors: Soren Hojgaard Jensen, Peter Halvor Larsen, Mogens Bjerg MogensenAbstract:Abstract Wind and solar power are troubled by large fluctuations in delivery due to changing weather. The surplus electricity can be used in a Solid Oxide Electrolyser Cell (SOEC) to split CO 2 + H 2 O into CO + H 2 ( + O 2 ) which can be catalyzed into various types of Synthetic Fuel using a suitable catalyst. H 2 O electrolysis with a new SOEC resulted in a record breaking current density of - 3.6 A / cm 2 at a cell voltage of 1.48 V. Assuming the surplus electricity to cost 3.6 US$/GJ, the H 2 Production price is estimated to 5 US$/GJ equivalent to 30 US$/barrel crude oil or to 0.6 US$/gge (gallon of gasoline equivalent).
