The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Wuermanbieke Hesitao - One of the best experts on this subject based on the ideXlab platform.
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electrochemical behavior of valve steel in a co2 Sulfurous Acid solution
Electrochimica Acta, 2017Co-Authors: Yong Xiang, Chen Li, Zhengwei Long, Chengyao Guan, Wei Wang, Wuermanbieke HesitaoAbstract:Abstract Sulfur dioxide (SO2) is one of the principal impurities in carbon dioxide (CO2) streams captured from coal-fired power plants, and the synergistic effect of CO2/SO2 on the corrosion of steels has attracted significant recent attention. In this work, the corrosion mechanism of valve steel X80CrSiMoW152, in a mixed CO2/Sulfurous Acid aqueous environment, was investigated. Experiments were conducted by adding different concentrations of Sulfurous Acid to a CO2-saturated solution at 25 °C under different pH conditions. The effect of Sulfurous Acid on the corrosion mechanism was examined by potentiodynamic scanning. Results revealed that for the anodic reaction, the presence of 100 ppmw Sulfurous Acid promoted the dissolution of steel in CO2-saturated solutions. In the cathodic polarization curve, a “second-wave” phenomenon was observed before the second limiting current for cases with Sulfurous Acid at pH 3.0 and for the case with 1,000 ppmw Sulfurous Acid at pH 2.0. These new “waves” were potentially caused by the direct reduction of Sulfurous Acid or bisulfite ions on the steel surface. The adsorption of Sulfurous Acid or bisulfite could also impede the reduction of hydrogen by competitive adsorption, and by a decrease in the cathodic-reaction area for the reduction of hydrogen ions.
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Electrochemical behavior of valve steel in a CO2/Sulfurous Acid solution
Electrochimica Acta, 2017Co-Authors: Yong Xiang, Chen Li, Zhengwei Long, Chengyao Guan, Wei Wang, Wuermanbieke HesitaoAbstract:Abstract Sulfur dioxide (SO2) is one of the principal impurities in carbon dioxide (CO2) streams captured from coal-fired power plants, and the synergistic effect of CO2/SO2 on the corrosion of steels has attracted significant recent attention. In this work, the corrosion mechanism of valve steel X80CrSiMoW152, in a mixed CO2/Sulfurous Acid aqueous environment, was investigated. Experiments were conducted by adding different concentrations of Sulfurous Acid to a CO2-saturated solution at 25 °C under different pH conditions. The effect of Sulfurous Acid on the corrosion mechanism was examined by potentiodynamic scanning. Results revealed that for the anodic reaction, the presence of 100 ppmw Sulfurous Acid promoted the dissolution of steel in CO2-saturated solutions. In the cathodic polarization curve, a “second-wave” phenomenon was observed before the second limiting current for cases with Sulfurous Acid at pH 3.0 and for the case with 1,000 ppmw Sulfurous Acid at pH 2.0. These new “waves” were potentially caused by the direct reduction of Sulfurous Acid or bisulfite ions on the steel surface. The adsorption of Sulfurous Acid or bisulfite could also impede the reduction of hydrogen by competitive adsorption, and by a decrease in the cathodic-reaction area for the reduction of hydrogen ions.
Liquan Chen - One of the best experts on this subject based on the ideXlab platform.
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research progress of vanadium redox flow battery for energy storage in china
Renewable Energy, 2008Co-Authors: Kelong Huang, Xiaogang Li, Liquan ChenAbstract:Principle and characteristics of vanadium redox flow battery (VRB), a novel energy storage system, was introduced. A research and development united laboratory of VRB was founded in Central South University in 2002 with the financial support of Panzhihua Steel Corporation. The laboratory focused their research mainly on the selection and preparation of electrode materials, membrane material and modification, stable concentrated electrolyte producing approach, test cell configuration design and optimization. Some relevant foundation problems, such as state of vanadium in Sulfurous Acid with various additives, the difference of electrochemical reaction rate in anode and in cathode, the crossover of vanadium ions and so on, have been emphasized. The details of these studies have been given and discussed. A 5kW VRB stack was fabricated in the laboratory and its performances, especially electrochemical performance such as voltage efficiencies, energy efficiencies, and durability, were fully tested. The results will be shown in the talk.
Klaus Schwetlick - One of the best experts on this subject based on the ideXlab platform.
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Antioxidant action of organic sulfites—II. Esters of Sulfurous Acid as primary antioxidants
Polymer Degradation and Stability, 1998Co-Authors: A Gunther, T Konig, Wolf D Habicher, Klaus SchwetlickAbstract:Abstract The effect of esters of Sulfurous Acid as primary antioxidants was examined. Different aliphatic, aromatic, open-chain and cyclic sulfites were synthesized. The reactions of organic sulfites with RO 2 and RO radicals, the chain carriers of the autoxidation of hydrocarbons and polymers, were simulated by means of the thermal decomposition of azobisisobutyronitrile (AIBN) in the presence of oxygen and of di-tert-butylperoxalate (DTBPO). The reactivity of organic sulfites with 2-cyanoisopropylperoxyl radicals is low. Only aromatic sulfites are able to trap peroxyl radicals; however, they are not very effective primary antioxidants. The reactions of the organic sulfites with tert-butoxyl radicals generally lead to an increase in the rate of decomposition of DTBPO, as determined from rate constants measured at 50 °C. A decomposition of DTBPO induced by liberated tert-butyl radicals in the presence of alkyl sulfites is very probable. Alkyl sulfites and aromatic sulfites with aliphatic groups act mainly as hydrogen donors in reactions with alkoxyl and peroxyl radicals.
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antioxidant action of organic sulfites ii esters of Sulfurous Acid as primary antioxidants
Polymer Degradation and Stability, 1998Co-Authors: A Gunther, T Konig, Wolf D Habicher, Klaus SchwetlickAbstract:Abstract The effect of esters of Sulfurous Acid as primary antioxidants was examined. Different aliphatic, aromatic, open-chain and cyclic sulfites were synthesized. The reactions of organic sulfites with RO 2 and RO radicals, the chain carriers of the autoxidation of hydrocarbons and polymers, were simulated by means of the thermal decomposition of azobisisobutyronitrile (AIBN) in the presence of oxygen and of di-tert-butylperoxalate (DTBPO). The reactivity of organic sulfites with 2-cyanoisopropylperoxyl radicals is low. Only aromatic sulfites are able to trap peroxyl radicals; however, they are not very effective primary antioxidants. The reactions of the organic sulfites with tert-butoxyl radicals generally lead to an increase in the rate of decomposition of DTBPO, as determined from rate constants measured at 50 °C. A decomposition of DTBPO induced by liberated tert-butyl radicals in the presence of alkyl sulfites is very probable. Alkyl sulfites and aromatic sulfites with aliphatic groups act mainly as hydrogen donors in reactions with alkoxyl and peroxyl radicals.
Yong Xiang - One of the best experts on this subject based on the ideXlab platform.
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electrochemical behavior of valve steel in a co2 Sulfurous Acid solution
Electrochimica Acta, 2017Co-Authors: Yong Xiang, Chen Li, Zhengwei Long, Chengyao Guan, Wei Wang, Wuermanbieke HesitaoAbstract:Abstract Sulfur dioxide (SO2) is one of the principal impurities in carbon dioxide (CO2) streams captured from coal-fired power plants, and the synergistic effect of CO2/SO2 on the corrosion of steels has attracted significant recent attention. In this work, the corrosion mechanism of valve steel X80CrSiMoW152, in a mixed CO2/Sulfurous Acid aqueous environment, was investigated. Experiments were conducted by adding different concentrations of Sulfurous Acid to a CO2-saturated solution at 25 °C under different pH conditions. The effect of Sulfurous Acid on the corrosion mechanism was examined by potentiodynamic scanning. Results revealed that for the anodic reaction, the presence of 100 ppmw Sulfurous Acid promoted the dissolution of steel in CO2-saturated solutions. In the cathodic polarization curve, a “second-wave” phenomenon was observed before the second limiting current for cases with Sulfurous Acid at pH 3.0 and for the case with 1,000 ppmw Sulfurous Acid at pH 2.0. These new “waves” were potentially caused by the direct reduction of Sulfurous Acid or bisulfite ions on the steel surface. The adsorption of Sulfurous Acid or bisulfite could also impede the reduction of hydrogen by competitive adsorption, and by a decrease in the cathodic-reaction area for the reduction of hydrogen ions.
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Electrochemical behavior of valve steel in a CO2/Sulfurous Acid solution
Electrochimica Acta, 2017Co-Authors: Yong Xiang, Chen Li, Zhengwei Long, Chengyao Guan, Wei Wang, Wuermanbieke HesitaoAbstract:Abstract Sulfur dioxide (SO2) is one of the principal impurities in carbon dioxide (CO2) streams captured from coal-fired power plants, and the synergistic effect of CO2/SO2 on the corrosion of steels has attracted significant recent attention. In this work, the corrosion mechanism of valve steel X80CrSiMoW152, in a mixed CO2/Sulfurous Acid aqueous environment, was investigated. Experiments were conducted by adding different concentrations of Sulfurous Acid to a CO2-saturated solution at 25 °C under different pH conditions. The effect of Sulfurous Acid on the corrosion mechanism was examined by potentiodynamic scanning. Results revealed that for the anodic reaction, the presence of 100 ppmw Sulfurous Acid promoted the dissolution of steel in CO2-saturated solutions. In the cathodic polarization curve, a “second-wave” phenomenon was observed before the second limiting current for cases with Sulfurous Acid at pH 3.0 and for the case with 1,000 ppmw Sulfurous Acid at pH 2.0. These new “waves” were potentially caused by the direct reduction of Sulfurous Acid or bisulfite ions on the steel surface. The adsorption of Sulfurous Acid or bisulfite could also impede the reduction of hydrogen by competitive adsorption, and by a decrease in the cathodic-reaction area for the reduction of hydrogen ions.
A Gunther - One of the best experts on this subject based on the ideXlab platform.
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Antioxidant action of organic sulfites—II. Esters of Sulfurous Acid as primary antioxidants
Polymer Degradation and Stability, 1998Co-Authors: A Gunther, T Konig, Wolf D Habicher, Klaus SchwetlickAbstract:Abstract The effect of esters of Sulfurous Acid as primary antioxidants was examined. Different aliphatic, aromatic, open-chain and cyclic sulfites were synthesized. The reactions of organic sulfites with RO 2 and RO radicals, the chain carriers of the autoxidation of hydrocarbons and polymers, were simulated by means of the thermal decomposition of azobisisobutyronitrile (AIBN) in the presence of oxygen and of di-tert-butylperoxalate (DTBPO). The reactivity of organic sulfites with 2-cyanoisopropylperoxyl radicals is low. Only aromatic sulfites are able to trap peroxyl radicals; however, they are not very effective primary antioxidants. The reactions of the organic sulfites with tert-butoxyl radicals generally lead to an increase in the rate of decomposition of DTBPO, as determined from rate constants measured at 50 °C. A decomposition of DTBPO induced by liberated tert-butyl radicals in the presence of alkyl sulfites is very probable. Alkyl sulfites and aromatic sulfites with aliphatic groups act mainly as hydrogen donors in reactions with alkoxyl and peroxyl radicals.
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antioxidant action of organic sulfites ii esters of Sulfurous Acid as primary antioxidants
Polymer Degradation and Stability, 1998Co-Authors: A Gunther, T Konig, Wolf D Habicher, Klaus SchwetlickAbstract:Abstract The effect of esters of Sulfurous Acid as primary antioxidants was examined. Different aliphatic, aromatic, open-chain and cyclic sulfites were synthesized. The reactions of organic sulfites with RO 2 and RO radicals, the chain carriers of the autoxidation of hydrocarbons and polymers, were simulated by means of the thermal decomposition of azobisisobutyronitrile (AIBN) in the presence of oxygen and of di-tert-butylperoxalate (DTBPO). The reactivity of organic sulfites with 2-cyanoisopropylperoxyl radicals is low. Only aromatic sulfites are able to trap peroxyl radicals; however, they are not very effective primary antioxidants. The reactions of the organic sulfites with tert-butoxyl radicals generally lead to an increase in the rate of decomposition of DTBPO, as determined from rate constants measured at 50 °C. A decomposition of DTBPO induced by liberated tert-butyl radicals in the presence of alkyl sulfites is very probable. Alkyl sulfites and aromatic sulfites with aliphatic groups act mainly as hydrogen donors in reactions with alkoxyl and peroxyl radicals.
