The Experts below are selected from a list of 23178 Experts worldwide ranked by ideXlab platform
Kunio Yoshikawa - One of the best experts on this subject based on the ideXlab platform.
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reactivity synergy and kinetics analysis of co2 co pyrolysis co gasification of biomass after Hydrothermal Treatment and coal blends
Energy & Fuels, 2020Co-Authors: Xudong Song, Kunio Yoshikawa, Lu Ding, Guangsuo YuAbstract:Co-gasification of biomass after Hydrothermal Treatment (HTT) and coal blends had great potential to realize the clean and efficient co-conversion of biomass and coal. In this study, co-gasificatio...
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Hydrothermal Treatment of postconsumer aseptic packaging material solid fuel production and aluminum recovery
Energy Procedia, 2017Co-Authors: Baskoro Lokahita, Kunio Yoshikawa, Fumitake TakahashiAbstract:Abstract In this study, Tetra Brik from Tetra Pak Company was used to produce solid fuel. Tetra Brik consists of paper, LDPE, and Aluminum arranged in 6 different layers. Aluminum should be recovered to obtain high-quality solid fuel. Hydrothermal Treatment was used to separate aluminum from the solid fuel. Temperature and time were controlled and observed to get the best result. The temperature was varied between 200 °C and 240 °C, while time was ranged from 0 and 60 minutes. The result showed that composite of aluminum and LDPE was formed in the process, and full separation occurred in the experiment other than 200 °C in 0 minutes. Ultimate and Proximate analysis were done to understand solid fuel characteristic. As the temperature and time got higher, the calorific value also increase.
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ash behavior during Hydrothermal Treatment for solid fuel applications part 1 overview of different feedstock
Energy Conversion and Management, 2016Co-Authors: Andres Fullana, Mikko Makela, Kunio YoshikawaAbstract:Abstract Differences in ash behavior during Hydrothermal Treatment were identified based on multivariate data analysis of literature information on 29 different feedstock. In addition, the solubility of individual elements was evaluated based on a smaller data set. As a result two different groups were distinguished based on char ash content and ash yield. Virgin terrestrial and aquatic biomass, such as different types of wood and algae, in addition to herbaceous and agricultural biomass, bark, brewer’s spent grain, compost and faecal waste showed lower char ash content than municipal solid wastes, anaerobic digestion residues and municipal and industrial sludge. Lower char ash content also correlated with lower ash yield indicating differences in chemical composition and ash solubility. Further evaluation of available data showed that ash in industrial sludge mainly contained anthropogenic Al, Fe and P or Ca and Si with low solubility during Hydrothermal Treatment. Char from corn stover, miscanthus, switch grass, rice hulls, olive, artichoke and orange wastes and empty fruit bunch had generally higher contents of K, Mg, S and Si than industrial sludge although differences existed within the group. In the future information on ash behavior should be used for enhancing the fuel properties of char based on feedstock type and Hydrothermal Treatment conditions.
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ash behavior during Hydrothermal Treatment for solid fuel applications part 2 effects of Treatment conditions on industrial waste biomass
Energy Conversion and Management, 2016Co-Authors: Mikko Makela, Kunio YoshikawaAbstract:Abstract This second half of our work on ash behavior concentrates on the effects of Hydrothermal Treatment conditions on paper sludge. Ash composition and solubility were determined based on Treatment temperature, reactor solid load and liquid pH using experimental design and univariate regression methods. In addition, ash properties for combustion were evaluated based on recent developments on ash classification. Based on the results, all experimental variables had a statistically significant effect on ash yields. Only reactor solid load was statistically insignificant for char ash content, which increased based on increasing Treatment temperature due to the decomposition of organic components. Ash dissolution and ash yield were governed by liquid pH and the generation of acids mainly due to the solubility of calcium carbonate identified as the main mineral species of paper sludge. Dissolution of calcium carbonate however decreased ash fusion temperatures more likely causing problems during char incineration. This indicated that decreasing the ash content of sludge during Hydrothermal Treatment can actually weaken ash properties for solid fuel applications.
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alternative solid fuel production from paper sludge employing Hydrothermal Treatment
Energy & Fuels, 2014Co-Authors: Chinnathan Areeprasert, Peitao Zhao, Yafei Shen, Kunio YoshikawaAbstract:This paper aims to investigate the alternative solid fuel production from paper sludge employing Hydrothermal Treatment (HTT) in a lab-scale facility for implementation of the pilot-scale plant. The paper sludge was subjected to the HTT under subcritical Hydrothermal conditions. In the lab-scale experiment, the temperature conditions were 180 °C, 200 °C, 220 °C, and 240 °C, respectively, while it was 197 °C in the pilot plant as the optimum condition. The holding time was 30 min in both cases. The Hydrothermally produced solid fuel was evaluated for the fuel property, the water removal performance, and the mass distribution. Furthermore, the energy balance of the process was studied. The higher heating value of the HT pretreated paper sludge was slightly improved. In addition, the produced solid fuel had comparable H/C and O/C atomic ratios with that of coal, indicating the presence of carbonization during the HTT process. Using the mechanical dewatering, only 4.1% of moisture in the raw paper sludge can ...
Kunihiro Fukui - One of the best experts on this subject based on the ideXlab platform.
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utilization of incineration fly ash from biomass power plants for zeolite synthesis from coal fly ash by microwave Hydrothermal Treatment
Advanced Powder Technology, 2018Co-Authors: Tomonori Fukasawa, Achmad Dwitama Karisma, Anni Huang, Akira Horigome, Norio Maeda, Kunihiro FukuiAbstract:Abstract Potassium-type zeolite (K-zeolite) was synthesized from coal fly ash and woody biomass incineration ash by microwave Hydrothermal Treatment. The woody biomass incineration ash was discharged from a biomass power plant, and extracted solutions of the material had a pH range of 11.5–13.0 and a high potassium concentration; therefore, it could be employed to replace the KOH solution that is typically used in the synthesis of K-zeolites. Consequently, we successfully synthesized a K-zeolite containing phillipsite phases from coal fly ash using extracted solutions obtained from biomass incineration fly ash. The ammonium adsorption capacity of the K-zeolite synthesized by microwave Hydrothermal Treatment was comparable to that of K-zeolite synthesized by oil-bath Hydrothermal Treatment (external heating). We also confirmed that the microwave heating method could shorten the K-zeolite synthesis time compared to that required when using oil-bath heating.
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synthesis of zeolite from coal fly ash by microwave Hydrothermal Treatment with pulverization process
Advanced Powder Technology, 2017Co-Authors: Tomonori Fukasawa, Achmad Dwitama Karisma, Daiki Shibata, Anni Huang, Kunihiro FukuiAbstract:Abstract Coal fly ash was Hydrothermally treated with a NaOH aqueous solution at 373 K using microwave heating with zirconia beads. We investigated the effect of the pulverization of coal fly ash on the generation rate and crystalline phase of synthesized zeolite. As a result, it was found that the pulverization process increased the generation rate of phillipsite in the early stage of the Hydrothermal Treatment because it enhances the dissolution of aluminate and silicate ions from coal fly ash and the generation rate of the aluminosilicate-gel precursor. On the other hand, prepulverization before the Hydrothermal Treatment and long-term pulverization during the Hydrothermal Treatment promote the formation of hydroxysodalite rather than phillipsite. In addition, we examined the effect of the addition of an aluminum source on the yield of synthesized phillipsite. This examination revealed that the excess addition of aluminate ions promotes the generation of hydroxysodalite and that timely and proper addition improves the yield of synthesized phillipsite. From these results, it was concluded that pulverization in the early stage of the Hydrothermal Treatment is effective for the generation of phillipsite from coal fly ash. Moreover, the timely and proper addition of an aluminum source improves the yield of synthesized phillipsite.
Edwin C Constable - One of the best experts on this subject based on the ideXlab platform.
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Hydrothermal Treatment of a hematite film leads to highly oriented faceted nanostructures with enhanced photocurrents
Chemistry of Materials, 2011Co-Authors: Debajeet K Bora, Rolf Erni, Giuseppino Fortunato, Artur Braun, Thomas Graule, Edwin C ConstableAbstract:A simple one-pot Hydrothermal method is described for converting a dip-coated hematite nanoparticulate film into an array of nanorods with superimposed flowerlike structures suitable for water splitting in photoelectrochemical cells. The Hydrothermal Treatment of the dip-coated hematite film with FeCl3·6H2O and l-arginine enhances the photocurrent by a factor of 2. It has been found that Hydrothermal Treatment changes the optical properties of the pristine hematite film, but the energy band gap (Eg) does not change significantly to show some electronic effect. X-ray diffractograms of pristine and Hydrothermally modified films reveal evolution of preferential orientations and textures. Electron micrographs show that the particles are more prismatic after modification, with a size of around 40 nm × 200 nm. The X-ray photoelectron spectroscopy valence-band spectra point at a depletion of the spectral intensity near the Fermi energy upon Hydrothermal modification. The photocurrent density of the pristine film...
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Hydrothermal Treatment of a hematite film leads to highly oriented faceted nanostructures with enhanced photocurrents
Chemistry of Materials, 2011Co-Authors: Debajeet K Bora, Rolf Erni, Giuseppino Fortunato, Artur Braun, Thomas Graule, Edwin C ConstableAbstract:A simple one-pot Hydrothermal method is described for conveying a dipcoatec hematite nano particle film into an array of nanorods with superimposed flowerlike structures suitable for water splitting in photoelectrochemical cells. The Hydrothermal Treatment of the dip-coated hematite film with FeCl(3) 6H(2)O and L-arginite enchances the photocurrent by a factor of 2. It has been found that Hydrothermal Treatment changes the optical properties of the pristenen hematite film, but the energy band gap (Eg) does not change significantly to show some electronic effect. X-ray diffractograms of pristine and Hydrothermally modified films reveal evolution fo preferential orientations and textures. Electron micrographs show that the particles are more prismatic after modification with a size of around 40nm x 200 nm. The X-ray photoelectron spectroscopy valence-band spectra point at a depletion of the spectrall intensity near the Fermi energy upon Hydrothermal modification. The photocurrent density of the pristine film reached 218 mu A/cm(2) after 48 h of Hydrothermal Treatment, and this increase was found to be due to the high specfic surface area of the modified film and changes in the optical properties of the pristene film after Hydrothermal Treatment.
Tomonori Fukasawa - One of the best experts on this subject based on the ideXlab platform.
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utilization of incineration fly ash from biomass power plants for zeolite synthesis from coal fly ash by microwave Hydrothermal Treatment
Advanced Powder Technology, 2018Co-Authors: Tomonori Fukasawa, Achmad Dwitama Karisma, Anni Huang, Akira Horigome, Norio Maeda, Kunihiro FukuiAbstract:Abstract Potassium-type zeolite (K-zeolite) was synthesized from coal fly ash and woody biomass incineration ash by microwave Hydrothermal Treatment. The woody biomass incineration ash was discharged from a biomass power plant, and extracted solutions of the material had a pH range of 11.5–13.0 and a high potassium concentration; therefore, it could be employed to replace the KOH solution that is typically used in the synthesis of K-zeolites. Consequently, we successfully synthesized a K-zeolite containing phillipsite phases from coal fly ash using extracted solutions obtained from biomass incineration fly ash. The ammonium adsorption capacity of the K-zeolite synthesized by microwave Hydrothermal Treatment was comparable to that of K-zeolite synthesized by oil-bath Hydrothermal Treatment (external heating). We also confirmed that the microwave heating method could shorten the K-zeolite synthesis time compared to that required when using oil-bath heating.
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synthesis of zeolite from coal fly ash by microwave Hydrothermal Treatment with pulverization process
Advanced Powder Technology, 2017Co-Authors: Tomonori Fukasawa, Achmad Dwitama Karisma, Daiki Shibata, Anni Huang, Kunihiro FukuiAbstract:Abstract Coal fly ash was Hydrothermally treated with a NaOH aqueous solution at 373 K using microwave heating with zirconia beads. We investigated the effect of the pulverization of coal fly ash on the generation rate and crystalline phase of synthesized zeolite. As a result, it was found that the pulverization process increased the generation rate of phillipsite in the early stage of the Hydrothermal Treatment because it enhances the dissolution of aluminate and silicate ions from coal fly ash and the generation rate of the aluminosilicate-gel precursor. On the other hand, prepulverization before the Hydrothermal Treatment and long-term pulverization during the Hydrothermal Treatment promote the formation of hydroxysodalite rather than phillipsite. In addition, we examined the effect of the addition of an aluminum source on the yield of synthesized phillipsite. This examination revealed that the excess addition of aluminate ions promotes the generation of hydroxysodalite and that timely and proper addition improves the yield of synthesized phillipsite. From these results, it was concluded that pulverization in the early stage of the Hydrothermal Treatment is effective for the generation of phillipsite from coal fly ash. Moreover, the timely and proper addition of an aluminum source improves the yield of synthesized phillipsite.
Debajeet K Bora - One of the best experts on this subject based on the ideXlab platform.
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Hydrothermal Treatment of a hematite film leads to highly oriented faceted nanostructures with enhanced photocurrents
Chemistry of Materials, 2011Co-Authors: Debajeet K Bora, Rolf Erni, Giuseppino Fortunato, Artur Braun, Thomas Graule, Edwin C ConstableAbstract:A simple one-pot Hydrothermal method is described for converting a dip-coated hematite nanoparticulate film into an array of nanorods with superimposed flowerlike structures suitable for water splitting in photoelectrochemical cells. The Hydrothermal Treatment of the dip-coated hematite film with FeCl3·6H2O and l-arginine enhances the photocurrent by a factor of 2. It has been found that Hydrothermal Treatment changes the optical properties of the pristine hematite film, but the energy band gap (Eg) does not change significantly to show some electronic effect. X-ray diffractograms of pristine and Hydrothermally modified films reveal evolution of preferential orientations and textures. Electron micrographs show that the particles are more prismatic after modification, with a size of around 40 nm × 200 nm. The X-ray photoelectron spectroscopy valence-band spectra point at a depletion of the spectral intensity near the Fermi energy upon Hydrothermal modification. The photocurrent density of the pristine film...
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Hydrothermal Treatment of a hematite film leads to highly oriented faceted nanostructures with enhanced photocurrents
Chemistry of Materials, 2011Co-Authors: Debajeet K Bora, Rolf Erni, Giuseppino Fortunato, Artur Braun, Thomas Graule, Edwin C ConstableAbstract:A simple one-pot Hydrothermal method is described for conveying a dipcoatec hematite nano particle film into an array of nanorods with superimposed flowerlike structures suitable for water splitting in photoelectrochemical cells. The Hydrothermal Treatment of the dip-coated hematite film with FeCl(3) 6H(2)O and L-arginite enchances the photocurrent by a factor of 2. It has been found that Hydrothermal Treatment changes the optical properties of the pristenen hematite film, but the energy band gap (Eg) does not change significantly to show some electronic effect. X-ray diffractograms of pristine and Hydrothermally modified films reveal evolution fo preferential orientations and textures. Electron micrographs show that the particles are more prismatic after modification with a size of around 40nm x 200 nm. The X-ray photoelectron spectroscopy valence-band spectra point at a depletion of the spectrall intensity near the Fermi energy upon Hydrothermal modification. The photocurrent density of the pristine film reached 218 mu A/cm(2) after 48 h of Hydrothermal Treatment, and this increase was found to be due to the high specfic surface area of the modified film and changes in the optical properties of the pristene film after Hydrothermal Treatment.
