Chemical-looping combustion(CLC)offers an effective approach for power generation and CO2 capture.In this work,an NiO-ZrO2 oxygen carrier prepared by three methods was subjected to an optimal reaction temperature test...Chemical-looping combustion(CLC)offers an effective approach for power generation and CO2 capture.In this work,an NiO-ZrO2 oxygen carrier prepared by three methods was subjected to an optimal reaction temperature test,an optimal flow test and a cyclic redox reaction test to explore the most suitable reaction conditions.Through comparative analysis,it is noted that the coprecipitation method is not suitable for the preparation of this NiO-ZrO2 oxygen carrier,while the oxygen carrier prepared by the mechanical mixing method and solution combustion method obtained a higher CH4 conversion rate and CO2 selectivity.In addition,these two oxygen carriers also showed high stability during successive CLC testing.Therefore,both the mechanical mixing method and the solution combustion method can be used to prepare NiO-ZrO2 oxygen carriers.展开更多
以吡咯烷二硫代氨基甲酸铵(APDC)氧化物作为共沉淀剂,建立了无载体离子有机共沉淀分离、石墨炉原子吸收光谱法测定海水中铜、铅、铬、镍的方法。考察了海水样品pH、共沉淀剂APDC和氧化剂H_2O_2的用量、陈化时间等因素对共沉淀分离效果...以吡咯烷二硫代氨基甲酸铵(APDC)氧化物作为共沉淀剂,建立了无载体离子有机共沉淀分离、石墨炉原子吸收光谱法测定海水中铜、铅、铬、镍的方法。考察了海水样品pH、共沉淀剂APDC和氧化剂H_2O_2的用量、陈化时间等因素对共沉淀分离效果的影响,优化了实验条件。结果证明,在p H4~5的海水样品中,加入4 m L 30 g/L APDC,1 m L H_2O_2,静置60 min,待测元素能与海水基体很好的分离。铜和铬含量在0~20μg/L范围内呈良好的线性关系,线性相关系数R>0.999;镍含量在0~30μg/L,铅含量在0~40μg/L范围内呈良好的线性关系,线性相关系数R>0.998;检出限分别为0.31,0.30,0.20,0.25μg/L,方法精密度好,加标回收率为88.8%~101.4%。方法可用于海水样品中铅、铜、镍、铬的常规检测。展开更多
基金Supported by the National Natural Science F oundation of China(No.51604137)the Natural Science Foundation of Guizhou Province,China(No.QianKeI Ie[20171]1064).
文摘Chemical-looping combustion(CLC)offers an effective approach for power generation and CO2 capture.In this work,an NiO-ZrO2 oxygen carrier prepared by three methods was subjected to an optimal reaction temperature test,an optimal flow test and a cyclic redox reaction test to explore the most suitable reaction conditions.Through comparative analysis,it is noted that the coprecipitation method is not suitable for the preparation of this NiO-ZrO2 oxygen carrier,while the oxygen carrier prepared by the mechanical mixing method and solution combustion method obtained a higher CH4 conversion rate and CO2 selectivity.In addition,these two oxygen carriers also showed high stability during successive CLC testing.Therefore,both the mechanical mixing method and the solution combustion method can be used to prepare NiO-ZrO2 oxygen carriers.
文摘以吡咯烷二硫代氨基甲酸铵(APDC)氧化物作为共沉淀剂,建立了无载体离子有机共沉淀分离、石墨炉原子吸收光谱法测定海水中铜、铅、铬、镍的方法。考察了海水样品pH、共沉淀剂APDC和氧化剂H_2O_2的用量、陈化时间等因素对共沉淀分离效果的影响,优化了实验条件。结果证明,在p H4~5的海水样品中,加入4 m L 30 g/L APDC,1 m L H_2O_2,静置60 min,待测元素能与海水基体很好的分离。铜和铬含量在0~20μg/L范围内呈良好的线性关系,线性相关系数R>0.999;镍含量在0~30μg/L,铅含量在0~40μg/L范围内呈良好的线性关系,线性相关系数R>0.998;检出限分别为0.31,0.30,0.20,0.25μg/L,方法精密度好,加标回收率为88.8%~101.4%。方法可用于海水样品中铅、铜、镍、铬的常规检测。
