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  1. AU="Matsuda, Hitoki"
  2. AU="Hobbs, Sarah Jane"
  3. AU="Visuttijai, Kittichate"
  4. AU="Madanitsa, Mwayi"
  5. AU="Delguste, Catherine"
  6. AU="Di Lonardo, Antonio"
  7. AU="Tsimberidou, Apostolia-Maria"
  8. AU="Beutner, Dirk"
  9. AU=Qiu Liying
  10. AU=Nishimura Gen AU=Nishimura Gen
  11. AU="Würz, Andrea"
  12. AU="Herrero, Ane Olazabal"
  13. AU="Tian, Qing-Shan"
  14. AU="Neff, Thomas B"
  15. AU="Chen, Yuyang"
  16. AU="Marija Trenkić-Božinović"
  17. AU="Aminifar, Mina"
  18. AU="Mascarenhas, Joana D P"
  19. AU="Pochet, Stéphanie"
  20. AU="Wittman, Hannah"
  21. AU="Sgolastra, Federica"
  22. AU="Kim, Dennis H"
  23. AU="Thai, Linh Duy"
  24. AU=Walker Scott C
  25. AU="Sheridan, Katherine"
  26. AU="Brown, Sharlie B"
  27. AU=Walker Kathleen
  28. AU="Miller, Donald G"
  29. AU="Sendino, O"
  30. AU="Rao, Arya"
  31. AU="Wong, Gary K W"

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  1. Artikel: Effect of coexisting inorganic chlorides on lead volatilization from CaO–SiO₂–Al₂O₃ molten slag under municipal solid waste gasification and melting conditions

    Kageyama, Hiroki / Osada, Shohichi / Nakata, Hiroyuki / Kubota, Mitsuhiro / Matsuda, Hitoki

    Fuel. 2013 Jan., v. 103

    2013  

    Abstract: The effect of inorganic chlorides on volatilization of lead compounds from CaO–SiO₂–Al₂O₃ molten slag under simulating conditions of gasification and melting of municipal solid waste was studied. It was found from the experiments that the volatilization ... ...

    Abstract The effect of inorganic chlorides on volatilization of lead compounds from CaO–SiO₂–Al₂O₃ molten slag under simulating conditions of gasification and melting of municipal solid waste was studied. It was found from the experiments that the volatilization of lead compounds from CaO (30wt.%)–SiO₂ (50wt.%)–Al₂O₃ (20wt.%) molten slag in a lab-scale electric furnace at 1773K in N₂, N₂–O₂ or N₂–CO–CO₂ atmosphere was promoted by the addition of NaCl, KCl and CaCl₂ to the slag containing PbO, in the order of CaCl₂>NaCl>KCl. The rate of volatilization and the amount of volatilized lead compounds were the highest by employing CaCl₂ in N₂–CO–CO₂ atmosphere, due to combined reduction of PbO to metallic lead (Pb) and chlorination of PbO to PbCl₂. By heating the molten slag at 1773K for about 10min, almost 100% of PbO was removed by adding CaCl₂ to the slag at a molar ratio of (Cl)/(Pb)=27. However, the heating of molten slag at 1773K for 10min was not sufficient for complete removal of PbO, even by adding an excessive amount of NaCl and KCl to the slag at a higher molar ratio of (Cl)/(Pb)=110. From the equilibrium calculations on the main elements involved in municipal solid waste in shaft-type gasification/melting furnace, almost 100% of lead compounds were predicted to volatilize as Pb, PbS and PbCl₂. The ratio of PbCl₂ increased with the increase in chlorine (Cl) content in the waste. It was considered by equilibrium calculations that increased volatilization of lead compounds was attributed to the pronounced formation of PbCl₂ by the reaction of PbO with HCl which was released from NaCl, KCl and CaCl₂.
    Schlagwörter calcium chloride ; calcium oxide ; chlorination ; chlorine ; gasification ; heat ; hydrochloric acid ; lead ; melting ; municipal solid waste ; nitrogen ; potassium chloride ; slags ; sodium chloride ; volatilization
    Sprache Englisch
    Erscheinungsverlauf 2013-01
    Umfang p. 94-100.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ISSN 0016-2361
    DOI 10.1016/j.fuel.2011.09.058
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  2. Artikel ; Online: Trichloroethylene decomposition and in-situ dry sorption of Cl-products by calcium oxides prepared from hydrated limes.

    Gotoh, Yoshimi / Iwata, Goichi / Choh, Kyaw / Kubota, Mitsuhiro / Matsuda, Hitoki

    Chemosphere

    2011  Band 85, Heft 4, Seite(n) 637–642

    Abstract: A comparison of CaOs produced by calcining two types of hydrated lime and calcium carbonate was made for decomposition of trichloroethylene and in-situ dry sorption of the decomposed Cl-products using a lab-scale gas flow type tubular packed bed reactor. ...

    Abstract A comparison of CaOs produced by calcining two types of hydrated lime and calcium carbonate was made for decomposition of trichloroethylene and in-situ dry sorption of the decomposed Cl-products using a lab-scale gas flow type tubular packed bed reactor. About 20 mg of CaO sample was mixed with about 2 g of Al2O3 particles and packed in the reactor and allowed to react with a flowing standard gas containing 500 ppm of C2HCl3 (N2 balance) at 673 and 873 K, under the condition that the reaction of CaO with C2HCl3 might be completed within a few hours. It was found that no thermal decomposition of C2HCl3 at or below 673 K was observed in a reactor packed only with Al2O3 particles. However, a considerable amount of decomposition of C2HCl3 was obtained in a reactor packed with CaO and Al2O3, even at 673 K. For 1 mol of CaO prepared by calcining highly reactive Ca(OH)2 at 673 K, decomposition of 0.42 mol of C2HCl3 and in-situ absorption product of 0.53 mol of CaCl2 were obtained. At 873 K, about 46% of C2HCl3 was thermally decomposed. The total amount of C2HCl3 decomposed in CaO-Al2O3 particle bed at 873 K became nearly twice larger than that at 673 K. For 1 mol of CaO prepared by calcining highly reactive Ca(OH)2 at 873 K, decomposition of 0.59 mol of C2HCl3 and in-situ absorption product of 0.67 mol of CaCl2 were obtained. Small amounts of C2Cl2, C2Cl4, CCl4, etc. were detected during decomposition of C2HCl3 at 673 and 873 K. It was recognized that the data on decomposition of C2HCl3 as well as in-situ dry sorption of Cl-products in CaO particle bed were correlated with specific surface area of the CaO employed.
    Mesh-Begriff(e) Absorption ; Aluminum Oxide/chemistry ; Calcium Compounds/chemistry ; Gas Chromatography-Mass Spectrometry ; Oxides/chemistry ; Temperature ; Trichloroethylene/chemistry
    Chemische Substanzen Calcium Compounds ; Oxides ; Trichloroethylene (290YE8AR51) ; lime (C7X2M0VVNH) ; Aluminum Oxide (LMI26O6933)
    Sprache Englisch
    Erscheinungsdatum 2011-10
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2011.07.010
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  3. Artikel: Trichloroethylene decomposition and in-situ dry sorption of Cl-products by calcium oxides prepared from hydrated limes

    Gotoh, Yoshimi / Iwata, Goichi / Choh, Kyaw / Kubota, Mitsuhiro / Matsuda, Hitoki

    Chemosphere. 2011 Oct., v. 85, no. 4

    2011  

    Abstract: A comparison of CaOs produced by calcining two types of hydrated lime and calcium carbonate was made for decomposition of trichloroethylene and in-situ dry sorption of the decomposed Cl-products using a lab-scale gas flow type tubular packed bed reactor. ...

    Abstract A comparison of CaOs produced by calcining two types of hydrated lime and calcium carbonate was made for decomposition of trichloroethylene and in-situ dry sorption of the decomposed Cl-products using a lab-scale gas flow type tubular packed bed reactor. About 20mg of CaO sample was mixed with about 2g of Al2O3 particles and packed in the reactor and allowed to react with a flowing standard gas containing 500ppm of C2HCl3 (N2 balance) at 673 and 873K, under the condition that the reaction of CaO with C2HCl3 might be completed within a few hours. It was found that no thermal decomposition of C2HCl3 at or below 673K was observed in a reactor packed only with Al2O3 particles. However, a considerable amount of decomposition of C2HCl3 was obtained in a reactor packed with CaO and Al2O3, even at 673K. For 1mol of CaO prepared by calcining highly reactive Ca(OH)2 at 673K, decomposition of 0.42mol of C2HCl3 and in-situ absorption product of 0.53mol of CaCl2 were obtained. At 873K, about 46% of C2HCl3 was thermally decomposed. The total amount of C2HCl3 decomposed in CaO–Al2O3 particle bed at 873K became nearly twice larger than that at 673K. For 1mol of CaO prepared by calcining highly reactive Ca(OH)2 at 873K, decomposition of 0.59mol of C2HCl3 and in-situ absorption product of 0.67mol of CaCl2 were obtained. Small amounts of C2Cl2, C2Cl4, CCl4, etc. were detected during decomposition of C2HCl3 at 673 and 873K. It was recognized that the data on decomposition of C2HCl3 as well as in-situ dry sorption of Cl-products in CaO particle bed were correlated with specific surface area of the CaO employed.
    Schlagwörter absorption ; calcium carbonate ; calcium chloride ; calcium oxide ; limes ; surface area ; trichloroethylene
    Sprache Englisch
    Erscheinungsverlauf 2011-10
    Umfang p. 637-642.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2011.07.010
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  4. Artikel: Ultrasound assisted extraction and decomposition of Cl-containing herbicide involved in model soil.

    Ueno, Shin-ichi / Fujita, Takafumi / Kuchar, Dalibor / Kubota, Mitsuhiro / Matsuda, Hitoki

    Ultrasonics sonochemistry

    2009  Band 16, Heft 1, Seite(n) 169–175

    Abstract: This work focused on ultrasound assisted extraction and decomposition of MCPA [(4-chloro-2-methylphenoxy) acetic acid] from model soil under argon atmosphere. In the experiments, 10 g model soil containing 1.75 x 10(-5) mol MCPA mixed with 90 g of de- ... ...

    Abstract This work focused on ultrasound assisted extraction and decomposition of MCPA [(4-chloro-2-methylphenoxy) acetic acid] from model soil under argon atmosphere. In the experiments, 10 g model soil containing 1.75 x 10(-5) mol MCPA mixed with 90 g of de-aired water was used. For a comparison, the experiments were also carried out using MCPA aqueous solution of which the concentration was adjusted to 1.75 x 10(-4) mol/l. The results showed that complete MCPA decomposition was achieved after 120 min in the case of MCPA aqueous solution. Meanwhile, in the case of model soil, the MCPA decomposition ratio of 0.9 was obtained after 600 min. This result was attributed to combined effect of MCPA adsorption on kaolin and to attenuation of ultrasound by solid particles of kaolin. To evaluate ultrasound attenuation in the presence of solid particles, experiments with slurry consisting of alumina particles and MCPA solution were carried out at alumina particles concentration range of 0.1-100g/l. The results showed that the MCPA initial decomposition rate significantly decreased with an increase in alumina particles concentration. Thus, it was concluded that the solid particles reduced the MCPA decomposition ratio by reducing the formation of reactive species such as hydroxyl radicals which are know to be necessary for MCPA decomposition.
    Mesh-Begriff(e) 2-Methyl-4-chlorophenoxyacetic Acid/chemistry ; 2-Methyl-4-chlorophenoxyacetic Acid/isolation & purification ; Adsorption ; Herbicides/chemistry ; Herbicides/isolation & purification ; Kaolin/chemistry ; Soil ; Time Factors ; Ultrasonics ; Water/chemistry
    Chemische Substanzen Herbicides ; Soil ; Water (059QF0KO0R) ; Kaolin (24H4NWX5CO) ; 2-Methyl-4-chlorophenoxyacetic Acid (D888C394VO)
    Sprache Englisch
    Erscheinungsdatum 2009-01
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1208333-1
    ISSN 1873-2828 ; 1350-4177
    ISSN (online) 1873-2828
    ISSN 1350-4177
    DOI 10.1016/j.ultsonch.2008.05.013
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel: Enhancement of saccharin removal from aqueous solution by activated carbon adsorption with ultrasonic treatment.

    Bernardo, Eileen C / Fukuta, Tadashi / Fujita, Takafumi / Ona, Erwin P / Kojima, Yoshihiro / Matsuda, Hitoki

    Ultrasonics sonochemistry

    2006  Band 13, Heft 1, Seite(n) 13–18

    Abstract: This study investigates the use of ultrasonication as a pretreatment process and its effect on the adsorption characteristics of saccharin onto activated carbon (AC). Ultrasonic decomposition of saccharin was performed at a frequency of 500 kHz under ... ...

    Abstract This study investigates the use of ultrasonication as a pretreatment process and its effect on the adsorption characteristics of saccharin onto activated carbon (AC). Ultrasonic decomposition of saccharin was performed at a frequency of 500 kHz under argon and O2/N2 (20/80 vol%) atmospheres. Adsorption was carried out using a commercial activated carbon. The behavior of total organic carbon (TOC) during ultrasonication was investigated. Saccharin removal after 180 min of ultrasonication under Ar and O2/N2 atmospheres are 38% and 26%, respectively, while the amount of saccharin removed by activated carbon adsorption without US pretreatment is 40% after 16 h. After 16 h of AC adsorption with 180 min of ultrasonic pretreatment under Ar and O2/N2 atmospheres, both removal ratios increased to 75%. These results indicated that the pretreatment of sonication under O2/N2 leads to the increase in the amount of saccharin adsorbed on AC. On the other hand, the TOC removal by decomposition by ultrasound is not more than 5% in both Ar and O2/N2 atmospheres after 180 min ultrasonication. However, the TOC removal increased to 54% and 69% after 16 h of adsorption of saccharin pretreated by ultrasonication for 180 min under Ar and O2/N2 atmospheres, respectively. About 13% and 16% TOC removal in Ar and in O2/N2, respectively, were achieved due to adsorption of the by-products. It is considered that the improvement in TOC removal is also brought about by the formation of the by-products that were adsorbed onto AC.
    Mesh-Begriff(e) Adsorption ; Charcoal/chemistry ; Chemical Fractionation/methods ; Saccharin/chemistry ; Saccharin/isolation & purification ; Saccharin/radiation effects ; Solutions ; Sonication ; Ultrafiltration/methods ; Water/chemistry
    Chemische Substanzen Solutions ; Water (059QF0KO0R) ; Charcoal (16291-96-6) ; Saccharin (FST467XS7D)
    Sprache Englisch
    Erscheinungsdatum 2006-01
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article
    ZDB-ID 1208333-1
    ISSN 1873-2828 ; 1350-4177
    ISSN (online) 1873-2828
    ISSN 1350-4177
    DOI 10.1016/j.ultsonch.2004.12.007
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel: Adsorption equilibrium modeling and solution chemistry dependence of fluoride removal from water by trivalent-cation-exchanged zeolite F-9.

    Onyango, Maurice S / Kojima, Yoshihiro / Aoyi, Ochieng / Bernardo, Eileen C / Matsuda, Hitoki

    Journal of colloid and interface science

    2004  Band 279, Heft 2, Seite(n) 341–350

    Abstract: Fluoride in drinking water above permissible levels is responsible for human dental and skeletal fluorosis. In this study, therefore, the large internal surface area of zeolite was utilized to create active sites for fluoride sorption by exchanging Na+- ... ...

    Abstract Fluoride in drinking water above permissible levels is responsible for human dental and skeletal fluorosis. In this study, therefore, the large internal surface area of zeolite was utilized to create active sites for fluoride sorption by exchanging Na+-bound zeolite with Al3+ or La3+ ions. Fluoride removal from water using Al3+- and La3+-exchanged zeolite F-9 particles was subsequently investigated to evaluate the fluoride sorption characteristics of the sorbents. Equilibrium isotherms such as the two-site Langmuir (L), Freundlich (F), Langmuir-Freundlich (LF), Redlich-Peterson (RP), Toth (T), and Dubinin-Radushkevitch (DR) were successfully used to model the experimental data. Modeling results showed that the isotherm parameters weakly depended on the solution temperature. From the DR isotherm parameters, it was considered that the uptake of fluoride by Al3+-exchanged zeolite proceeded by an ion-exchange mechanism (E = 11.32-12.13 kJ/mol), while fluoride-La3+-exchanged zeolite interaction proceeded by physical adsorption (E = 7.41-7.72 kJ/mol). Factors from the solution chemistry that affected fluoride removal from water were the solution pH and bicarbonate content. The latter factor buffered the system pH at higher values and thus diminished the affinity of the active sites for fluoride. Natural groundwater samples from two Kenyan tube wells were tested and results are discussed in relation to solution chemistry. In overall, Al3+-exchanged zeolite was found to be superior to La3+-exchanged zeolite in fluoride uptake within the tested concentration range.
    Mesh-Begriff(e) Adsorption ; Cations/chemistry ; Fluorides/chemistry ; Humans ; Hydrogen-Ion Concentration ; Models, Chemical ; Solutions/chemistry ; Surface Properties ; Temperature ; Water/chemistry ; Zeolites/chemistry
    Chemische Substanzen Cations ; Solutions ; Water (059QF0KO0R) ; Zeolites (1318-02-1) ; Fluorides (Q80VPU408O)
    Sprache Englisch
    Erscheinungsdatum 2004-11-15
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2004.06.038
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel: Catalytic wet oxidation of o-chlorophenol at mild temperatures under alkaline conditions.

    Kojima, Yoshihiro / Fukuta, Tadashi / Yamada, Takehisa / Onyango, Maurice S / Bernardo, Eileen C / Matsuda, Hitoki / Yagishita, Kohichi

    Water research

    2005  Band 39, Heft 1, Seite(n) 29–36

    Abstract: Wet oxidation of a 100 ppm aqueous solution of o-chlorophenol (o-CP) was performed in a lab-scale batch reactor using 3% Ru/TiO(2) catalyst at 373 and 413 K, and a partial oxygen pressure of 0.1 MPa. The experiments were conducted by varying the initial ... ...

    Abstract Wet oxidation of a 100 ppm aqueous solution of o-chlorophenol (o-CP) was performed in a lab-scale batch reactor using 3% Ru/TiO(2) catalyst at 373 and 413 K, and a partial oxygen pressure of 0.1 MPa. The experiments were conducted by varying the initial pH values of o-CP solution from pH 6.3 to 9.8 and 11.8. From the results, it was revealed that the catalytic decomposition of o-CP occurred most effectively at 413 K and at the initial pH of 9.8. Complete decomposition and dechlorination of o-CP were almost achieved within 1h, and about 85% of TOC was removed in 3.0 h. On the other hand, the catalytic wet oxidation of o-CP at a higher pH value of 11.8 was not effective in the removal of TOC. The incomplete removal of TOC at the initial pH of 11.8 is likely attributed to a low pK(a) of carboxylic acids formed during the wet oxidation of o-CP.
    Mesh-Begriff(e) Carbon/chemistry ; Catalysis ; Chlorophenols/analysis ; Chlorophenols/chemistry ; Hydrogen-Ion Concentration ; Industrial Waste ; Oxidation-Reduction ; Temperature ; Water ; Water Pollutants, Chemical/analysis ; Water Purification/methods
    Chemische Substanzen Chlorophenols ; Industrial Waste ; Water Pollutants, Chemical ; Water (059QF0KO0R) ; Carbon (7440-44-0) ; 2-chlorophenol (K9KAV4K6BN)
    Sprache Englisch
    Erscheinungsdatum 2005-01
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 202613-2
    ISSN 1879-2448 ; 0043-1354
    ISSN (online) 1879-2448
    ISSN 0043-1354
    DOI 10.1016/j.watres.2004.09.007
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  8. Artikel: Effects of dissolved gas species on ultrasonic degradation of (4-chloro-2-methylphenoxy) acetic acid (MCPA) in aqueous solution.

    Kojima, Yoshihiro / Fujita, Takafumi / Ona, Erwin P / Matsuda, Hitoki / Koda, Shinobu / Tanahashi, Naoki / Asakura, Yoshiyuki

    Ultrasonics sonochemistry

    2005  Band 12, Heft 5, Seite(n) 359–365

    Abstract: Sonochemical degradation of MCPA ((4-chloro-2-methylphenoxy) acetic acid) in dilute aqueous solutions was studied using ultrasound with a frequency of 500 kHz. The effect of gas atmosphere on MCPA degradation was investigated in nitrogen (N(2)), air (O(2) ...

    Abstract Sonochemical degradation of MCPA ((4-chloro-2-methylphenoxy) acetic acid) in dilute aqueous solutions was studied using ultrasound with a frequency of 500 kHz. The effect of gas atmosphere on MCPA degradation was investigated in nitrogen (N(2)), air (O(2)/N(2)), oxygen (O(2)), argon (Ar) and Ar/O(2) (60/40% v/v) atmospheres. For sonochemical degradation of MCPA in N(2), air (O(2)/N(2)), O(2) and Ar atmospheres, the rate enhancement of MCPA decomposition by sonolysis was found to be more effective in an O(2)-enriched atmosphere compared to Ar atmosphere. It was considered that a higher amount of oxidants was formed in a higher O(2) partial pressure, which accelerated MCPA decomposition in a radical reaction system. On the other hand, both dechlorination and total organic carbon (TOC) removal rates were higher in Ar atmosphere, compared to those in O(2)/N(2) atmosphere. It was found that, MCPA was most effectively decomposed by sonication in Ar/O(2) (60/40% v/v) atmosphere, with higher rates of decomposition, dechlorination and TOC removal.
    Mesh-Begriff(e) 2-Methyl-4-chlorophenoxyacetic Acid/chemistry ; 2-Methyl-4-chlorophenoxyacetic Acid/radiation effects ; Acetic Acid ; Formates ; Gases ; Solutions ; Ultrasonics ; Waste Disposal, Fluid
    Chemische Substanzen Formates ; Gases ; Solutions ; formic acid (0YIW783RG1) ; 2-Methyl-4-chlorophenoxyacetic Acid (D888C394VO) ; Acetic Acid (Q40Q9N063P)
    Sprache Englisch
    Erscheinungsdatum 2005-04
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1208333-1
    ISSN 1873-2828 ; 1350-4177
    ISSN (online) 1873-2828
    ISSN 1350-4177
    DOI 10.1016/j.ultsonch.2004.04.002
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel: Ash Utilization for High-Temperature Acid Gas Cleaning

    Matsuda, Hitoki / Ozawa, Shoji / Hirabayashi, Daisuke / Saito, Yuji / Al-Shawabkeh, Ali

    1999  Band 2, Seite(n) II.287–II.292

    Abstract: The present study is concerned with utilization of such solid wastes as coal bumt ash and coal slags for dry gas cleaning sorbent at high temperatures. Coal ashes from FBC (Fluidized Bed Coal Combustor) and PCC (Pulverized Coal Combustor) and coal slags ... ...

    Abstract The present study is concerned with utilization of such solid wastes as coal bumt ash and coal slags for dry gas cleaning sorbent at high temperatures. Coal ashes from FBC (Fluidized Bed Coal Combustor) and PCC (Pulverized Coal Combustor) and coal slags were tested to investigate whether they might be reused as solid absorbent for removing those acid gases as SO2, H2S and HCl which are discharged from combustion processes. It was found that calcium compounds involved in coal ashes have the function of both SO2, H2S and HCl removal. The absorption capacity of calcium oxide toward SO2 and HCl depended on its inner surface area and the pore volume, and was improved by treating the ashes in calcium hydroxide aqueous solution. The reactivity of CaO in the ashes was almost similar to that of CaO prepared from natural calcite. Even the slags reacted with H2S to a certain extent. The main component in the slag which participated in sulfidation reaction was considered to be iron. The calcium oxide seemed to be captured by SiO2 in the form of CaO-SiO2 which is comparatively stable to chemical reactions.
    Schlagwörter Gasreinigung ; Rueckstandsverwertung ; Asche ; Verbrennungsrueckstand ; Absorption ; Entschwefelung ; Abgasentschwefelung ; Schadstoffelimination ; Abfallverwertung ; Schlacke
    Sprache Englisch
    Dokumenttyp Artikel
    Datenquelle OPAC und UmweltLIteraturDATenbank (ULIDAT) des Umweltbundesamtes (UBA)

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