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Yaoqiang Chen - One of the best experts on this subject based on the ideXlab platform.
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factors determining gasoline soot abatement over ceo2 zro2 mnox catalysts under low oxygen Concentration Condition
Journal of The Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.
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Factors determining gasoline soot abatement over CeO2–ZrO2-MnOx catalysts under low oxygen Concentration Condition
Journal of the Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.
Peng Yao - One of the best experts on this subject based on the ideXlab platform.
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factors determining gasoline soot abatement over ceo2 zro2 mnox catalysts under low oxygen Concentration Condition
Journal of The Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.
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Factors determining gasoline soot abatement over CeO2–ZrO2-MnOx catalysts under low oxygen Concentration Condition
Journal of the Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.
Mohammad Shafiur Rahman - One of the best experts on this subject based on the ideXlab platform.
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State Diagram of Crystallized Date-Syrup: Freezing Curve, Glass Transition, Crystals-Melting and Maximal-Freeze-Concentration Condition
Thermochimica Acta, 2018Co-Authors: Kutaila Abbas Al-farsi, Nasser Al-habsi, Mohammad Shafiur RahmanAbstract:ABSTRACT State diagram of crystallized date-syrup was developed based on the freezing curve, glass transition curve, sugar crystals-melting curve, maximal-freeze-Concentration Condition, and eutectic point. The freezing point, glass transition, and sugar crystal-melting curves were modeled by Chen’s model based on Clausius-Clapeyron equation, Gordon-Taylor equation and Flory-Huggins equation, respectively. The ultimate maximal-freeze-Concentration Condition was determined as -42.8 °C [i.e. (Tm′)u, end point of freezing curve]. The intersection point on the freezing curve from the vertical line passing through the end point of freezing [i.e. (Tm′)u] as Xs′ [i.e. 0.73 g/g sample (i.e. un-freezable water as 0.27 g/g sample)]. The eutectic temperature and solutes content at eutectic point were determined as -10.2 °C and 0.39 g/g sample, respectively.
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thermal characteristics and state diagram of freeze dried broccoli freezing curve maximal freeze Concentration Condition glass line and solids melting
Thermochimica Acta, 2017Co-Authors: Sithara Suresh, Nejib Guizani, Nasser Alhabsi, Mohammad Shafiur RahmanAbstract:Abstract Stability of foods during processing and storage can be determined from their phase and state diagrams. In this study, state diagram of broccoli was developed considering freezing curve, glass line, maximal-freeze-Concentration Conditions, solids-melting and BET-monolayer line. The freezing point, glass transition and solids-melting were measured and modeled by Chen’s model, Gordon-Taylor model, and Flory-Huggins model, respectively. The ultimate maximal-freeze-Concentration Conditions ( T m ′) u (i.e. end temperature of freezing) and ( T g ′′′) u [i.e. end glass transition at ( T m ′) u ] were found as −30.0 °C and −32.2 °C, respectively, and solids content (i.e. X s ′) at this point was 0.70 g/g sample. The solids-water interaction (χ) during melting was estimated as 0.69 (dimensionless) from Flory-Huggins model, and BET-monolayer was observed as 0.089 g/g dry-solids at 20 °C.
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Thermal characteristics of Agaricus bisporus mushroom: freezing point, glass transition, and maximal-freeze-Concentration Condition
international food research journal, 2013Co-Authors: Nejib Guizani, Mohammad Shafiur Rahman, M. Klibi, Amani S. Al-rawahi, Salwa BornazAbstract:The stability of foods strongly depends on the state of water (i.e. water activity) and temperature. Agaricus bisporus mushroom plays an important role as a nutritional and functional food; however little information is available on the effect of processing on its stability. This study measures the thermal characteristics and sorption isotherm of Agaricus bisporus by differential scanning calorimetry (DSC) and isopiestic method, respectively. Thermograms of samples containing un-freezable water (below moisture content 0. 11 g/g sample, i.e. wet basis) showed no glass transition which is indicative of the complexity of mushroom texture. Samples containing freezable water above 0.17 g/g sample exhibited glass transition. The BET monolayer value was 0.061 g/g dry-solids (i.e. dry basis). Actual maximal-freeze-Concentration Conditions was found as X s ’ (characteristic solids content) = 0.782 g/g sample, and T m ’ (characteristic end point of freezing) = -30 o C. The glass transition data and isotherm of A. bisporus containing un-freezable water could be used to determine stability region of dried mushroom during its storage, whereas T m ’ to determine the stability for the frozen storage. In addition it could be used in designing drying and freezing processes, respectively.
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state diagram of dates glass transition freezing curve and maximal freeze Concentration Condition
Journal of Food Engineering, 2010Co-Authors: Nejib Guizani, Mohammad Shafiur Rahman, Ghalib Said Alsaidi, Salwa Bornaz, Ahmed AlalawiAbstract:Abstract The state diagram of Deglet Nour dates was developed using freezing curve, glass transition line, and maximal-freeze-Concentration Condition. Freezing points and glass transition temperature were measured by differential scanning calorimetry (DSC) as a function of water content. Freezing points were fitted to the Clausius–Clapeyron equation adjusted with un-freezable water, and glass transition was fitted to the Gordon–Taylor model. Glass transition decreased with a decrease in solids content, confirming the plasticizing effect of water on date solids. Freezing point data indicated the temperature when ice formed and dates would be most stable in terms of its deterioration if it can be stored below its glass transition. Maximum-freeze-Concentration Conditions was found as X s ′ (characteristic solids content) = 0.78 g/g sample, with the characteristic temperature as T g ′ (characteristics glass transition) = −48 °C and T m ′ (characteristic end point of freezing) = −38.2 °C. These characteristics indicated that 0.22 g/g sample water in date was un-freezable (i.e. bound with solids or unable to form ice). The developed state diagram can be used in determining the stability of dates during storage as a function of temperature and moisture content. Moreover, it can be used to determine optimum drying and freezing Conditions.
Yi Jiao - One of the best experts on this subject based on the ideXlab platform.
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factors determining gasoline soot abatement over ceo2 zro2 mnox catalysts under low oxygen Concentration Condition
Journal of The Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.
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Factors determining gasoline soot abatement over CeO2–ZrO2-MnOx catalysts under low oxygen Concentration Condition
Journal of the Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.
Xue Jiang - One of the best experts on this subject based on the ideXlab platform.
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factors determining gasoline soot abatement over ceo2 zro2 mnox catalysts under low oxygen Concentration Condition
Journal of The Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.
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Factors determining gasoline soot abatement over CeO2–ZrO2-MnOx catalysts under low oxygen Concentration Condition
Journal of the Energy Institute, 2020Co-Authors: Peng Yao, Xue Jiang, Yi Jiao, Jianli Wang, Yaoqiang ChenAbstract:Abstract Soot oxidation under a low Concentration O2 (0.5% O2/N2) was investigated using CeO2–ZrO2-MnOx mixed oxides with varied amounts of MnOx, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low Concentration of O2. In particular, CeO2–ZrO2-MnOx with 10% MnOx doping (M10-CZ) showed the highest catalytic activity with its T50 values of 340 °C under tight contact Condition. The results of N2 adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO2–ZrO2 and CeO2–ZrO2-MnOx catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H2-TPR), O2 temperature program desorption (O2-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnOx addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen Concentration Condition.