The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Yingyun Qiao - One of the best experts on this subject based on the ideXlab platform.
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thermal cracking behavior products distribution and char steam gasification kinetics of Seawater spirulina by tg ftir and py gc ms
Renewable Energy, 2020Co-Authors: Jie Li, Yuanyu Tian, Peijie Zong, Yingyun QiaoAbstract:Abstract In this study, fast pyrolysis of Seawater Spirulina, is carried out to evaluate the potential of deriving valuable chemicals and fuel molecules from this Seawater algae variety. The devolatilization behavior and gaseous product evolution of Seawater Spirulina were carried out by TG-FTIR. Py-GC-MS was employed to investigate the composition and distribution of volatile products formed from the Seawater Spirulina through high-temperature fast pyrolysis process. Finally, the Seawater Spirulina char gasification reactivity and kinetic parameters were evaluated using advanced methods of volume, shrinking core and random pore. Results indicate that the thermal cracking process of Seawater Spirulina mainly consisted of three reaction stages, including dehydration and drying stage, fast pyrolysis stage and residues slow decomposition stage. High heating rate has significant effect on the performance of devolatilization profiles. H2O, CH4, CO2, HNCO, NH3, HCN, CO, C–O bond and C O bond were the typical gaseous products released from the fast pyrolysis stage of Seawater Spirulina. The maximum release rate of Seawater Spirulina for CH4 was located at about 450 °C, corresponding to the main pyrolysis of long-chain fatty acids from lipid fraction. The high temperature fast pyrolysis of Seawater Spirulina resulted in aliphatic (alkanes, alkenes) and aromatic hydrocarbons, esters, oxygenates (carboxylic acids, aldehydes, ketones, and alcohols), phenolics, and nitrogen- and sulfur-containing organic compounds. Above 750 °C was considered as the optimum temperature, which can reduce the generation of oxygenated compounds, and the content of nitrogen and phenolic compounds were decreased, maximum yield of quantified hydrocarbons was observed. The increase of gasification temperature can obviously improve the gasification reactivity of Seawater Spirulina chars. The activation energies of the VM, SCM and RPM models of Seawater Spirulina chars were 187.95, 173.14 and 154.34 kJ/mol, respectively. RPM displays a significant fitness with the experimental data than those of the other two models.
Justin B Ries - One of the best experts on this subject based on the ideXlab platform.
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effects of secular variation in Seawater mg ca ratio calcite aragonite seas on caco3 sediment production by the calcareous algae halimeda penicillus and udotea evidence from recent experiments and the geological record
Terra Nova, 2009Co-Authors: Justin B RiesAbstract:Independent lines of geological evidence suggest that fluctuations in the Mg ⁄ Ca ratio of Seawater between 1.0 and 5.2 have caused the oceans to alternate between favouring the precipitation of the aragonite and high-Mg calcite polymorphs of calcium carbonate (mMg ⁄ Ca > 2; aragonite seas) and the low-Mg calcite polymorph (mMg ⁄ Ca < 2; calcite seas) throughout Phanerozoic time. The rise of aragonite-secreting bryopsidalean algae as major producers of carbonate sediments in middle Palaeogene time, a role that they maintained through to the present, has been attributed to a transition from calcite-to-aragonite seas in early Cenozoic time. Recent experiments on the modern, carbonate-sediment-producing bryopsidales Halimeda, Penicillus and Udotea reveal that their rates of calcification, linear extension and primary production decline when reared in experimental calcite Seawaters (mMg ⁄ Ca < 2). These normally aragonitesecreting algae also began producing at least one-quarter of their CaCO3 as calcite under calcite sea conditions, indicating that their biomineralogical control can be partially overridden by ambient Seawater chemistry. The observation that primary production and linear extension declined along with calcification in the mineralogically unfavourable Seawater suggests that photosynthesis within these algae is enhanced by calcification via liberation of CO2 and ⁄ or H + . Thus, the reduced fitness of these algae associated with their low rates of calcification in calcite seas may have been exacerbated by concomitant reductions in tissue mass and algal height.
Jie Li - One of the best experts on this subject based on the ideXlab platform.
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thermal cracking behavior products distribution and char steam gasification kinetics of Seawater spirulina by tg ftir and py gc ms
Renewable Energy, 2020Co-Authors: Jie Li, Yuanyu Tian, Peijie Zong, Yingyun QiaoAbstract:Abstract In this study, fast pyrolysis of Seawater Spirulina, is carried out to evaluate the potential of deriving valuable chemicals and fuel molecules from this Seawater algae variety. The devolatilization behavior and gaseous product evolution of Seawater Spirulina were carried out by TG-FTIR. Py-GC-MS was employed to investigate the composition and distribution of volatile products formed from the Seawater Spirulina through high-temperature fast pyrolysis process. Finally, the Seawater Spirulina char gasification reactivity and kinetic parameters were evaluated using advanced methods of volume, shrinking core and random pore. Results indicate that the thermal cracking process of Seawater Spirulina mainly consisted of three reaction stages, including dehydration and drying stage, fast pyrolysis stage and residues slow decomposition stage. High heating rate has significant effect on the performance of devolatilization profiles. H2O, CH4, CO2, HNCO, NH3, HCN, CO, C–O bond and C O bond were the typical gaseous products released from the fast pyrolysis stage of Seawater Spirulina. The maximum release rate of Seawater Spirulina for CH4 was located at about 450 °C, corresponding to the main pyrolysis of long-chain fatty acids from lipid fraction. The high temperature fast pyrolysis of Seawater Spirulina resulted in aliphatic (alkanes, alkenes) and aromatic hydrocarbons, esters, oxygenates (carboxylic acids, aldehydes, ketones, and alcohols), phenolics, and nitrogen- and sulfur-containing organic compounds. Above 750 °C was considered as the optimum temperature, which can reduce the generation of oxygenated compounds, and the content of nitrogen and phenolic compounds were decreased, maximum yield of quantified hydrocarbons was observed. The increase of gasification temperature can obviously improve the gasification reactivity of Seawater Spirulina chars. The activation energies of the VM, SCM and RPM models of Seawater Spirulina chars were 187.95, 173.14 and 154.34 kJ/mol, respectively. RPM displays a significant fitness with the experimental data than those of the other two models.
Peijie Zong - One of the best experts on this subject based on the ideXlab platform.
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thermal cracking behavior products distribution and char steam gasification kinetics of Seawater spirulina by tg ftir and py gc ms
Renewable Energy, 2020Co-Authors: Jie Li, Yuanyu Tian, Peijie Zong, Yingyun QiaoAbstract:Abstract In this study, fast pyrolysis of Seawater Spirulina, is carried out to evaluate the potential of deriving valuable chemicals and fuel molecules from this Seawater algae variety. The devolatilization behavior and gaseous product evolution of Seawater Spirulina were carried out by TG-FTIR. Py-GC-MS was employed to investigate the composition and distribution of volatile products formed from the Seawater Spirulina through high-temperature fast pyrolysis process. Finally, the Seawater Spirulina char gasification reactivity and kinetic parameters were evaluated using advanced methods of volume, shrinking core and random pore. Results indicate that the thermal cracking process of Seawater Spirulina mainly consisted of three reaction stages, including dehydration and drying stage, fast pyrolysis stage and residues slow decomposition stage. High heating rate has significant effect on the performance of devolatilization profiles. H2O, CH4, CO2, HNCO, NH3, HCN, CO, C–O bond and C O bond were the typical gaseous products released from the fast pyrolysis stage of Seawater Spirulina. The maximum release rate of Seawater Spirulina for CH4 was located at about 450 °C, corresponding to the main pyrolysis of long-chain fatty acids from lipid fraction. The high temperature fast pyrolysis of Seawater Spirulina resulted in aliphatic (alkanes, alkenes) and aromatic hydrocarbons, esters, oxygenates (carboxylic acids, aldehydes, ketones, and alcohols), phenolics, and nitrogen- and sulfur-containing organic compounds. Above 750 °C was considered as the optimum temperature, which can reduce the generation of oxygenated compounds, and the content of nitrogen and phenolic compounds were decreased, maximum yield of quantified hydrocarbons was observed. The increase of gasification temperature can obviously improve the gasification reactivity of Seawater Spirulina chars. The activation energies of the VM, SCM and RPM models of Seawater Spirulina chars were 187.95, 173.14 and 154.34 kJ/mol, respectively. RPM displays a significant fitness with the experimental data than those of the other two models.
Yuanyu Tian - One of the best experts on this subject based on the ideXlab platform.
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thermal cracking behavior products distribution and char steam gasification kinetics of Seawater spirulina by tg ftir and py gc ms
Renewable Energy, 2020Co-Authors: Jie Li, Yuanyu Tian, Peijie Zong, Yingyun QiaoAbstract:Abstract In this study, fast pyrolysis of Seawater Spirulina, is carried out to evaluate the potential of deriving valuable chemicals and fuel molecules from this Seawater algae variety. The devolatilization behavior and gaseous product evolution of Seawater Spirulina were carried out by TG-FTIR. Py-GC-MS was employed to investigate the composition and distribution of volatile products formed from the Seawater Spirulina through high-temperature fast pyrolysis process. Finally, the Seawater Spirulina char gasification reactivity and kinetic parameters were evaluated using advanced methods of volume, shrinking core and random pore. Results indicate that the thermal cracking process of Seawater Spirulina mainly consisted of three reaction stages, including dehydration and drying stage, fast pyrolysis stage and residues slow decomposition stage. High heating rate has significant effect on the performance of devolatilization profiles. H2O, CH4, CO2, HNCO, NH3, HCN, CO, C–O bond and C O bond were the typical gaseous products released from the fast pyrolysis stage of Seawater Spirulina. The maximum release rate of Seawater Spirulina for CH4 was located at about 450 °C, corresponding to the main pyrolysis of long-chain fatty acids from lipid fraction. The high temperature fast pyrolysis of Seawater Spirulina resulted in aliphatic (alkanes, alkenes) and aromatic hydrocarbons, esters, oxygenates (carboxylic acids, aldehydes, ketones, and alcohols), phenolics, and nitrogen- and sulfur-containing organic compounds. Above 750 °C was considered as the optimum temperature, which can reduce the generation of oxygenated compounds, and the content of nitrogen and phenolic compounds were decreased, maximum yield of quantified hydrocarbons was observed. The increase of gasification temperature can obviously improve the gasification reactivity of Seawater Spirulina chars. The activation energies of the VM, SCM and RPM models of Seawater Spirulina chars were 187.95, 173.14 and 154.34 kJ/mol, respectively. RPM displays a significant fitness with the experimental data than those of the other two models.
