The Co@NC catalysts with different morphologies were prepared by two step process,solvent control growth and pyrolysis method.The polyhedral Co@NC-67P-450 catalyst has a relatively high CoNx content and exhibits excel...The Co@NC catalysts with different morphologies were prepared by two step process,solvent control growth and pyrolysis method.The polyhedral Co@NC-67P-450 catalyst has a relatively high CoNx content and exhibits excellent phenol hydrogenation activity(conversion 96.9%)at 160℃,3 MPa,which is higher than that of leaf shaped Co@NC-67L-450 catalyst(conversion 75.4%).We demonstrated Co_(3)O_(4)was reduced to the Co^(0)during the reaction.Moreover,CoNx species contribute to the superior hydrogenation activity of phenol.The Co-based catalysts can be easily recovered through the magnetic separation and performed the high stability.展开更多
目的本文旨在研究直接除碳重量法测定碳复合磷酸铁锂中总磷含量。方法采用高氯酸分解试样并同时除去样品中的碳后,在酸性介质中,正磷酸根与喹钼柠酮沉淀剂反应生成黄色磷钼酸喹啉沉淀,经过滤、洗涤、干燥、称量,即可求出磷含量。结果高...目的本文旨在研究直接除碳重量法测定碳复合磷酸铁锂中总磷含量。方法采用高氯酸分解试样并同时除去样品中的碳后,在酸性介质中,正磷酸根与喹钼柠酮沉淀剂反应生成黄色磷钼酸喹啉沉淀,经过滤、洗涤、干燥、称量,即可求出磷含量。结果高氯酸消解除碳,样品消解完全且清亮,减少了过滤除碳步骤,通过优化条件试验、对该方法进行了精密度和准确度试验,其相对标准偏差(Relative Standard Deviation,RSD)小于0.2%,加标回收率为98.4%~101.1%。该方法最大的优点在于碳在消解过程中直接除去,消除了碳包裹对磷测定的影响,不需要过滤除碳,缩短了操作流程,分析时间短,高含量磷用经典重量法测定,其精密度和准确度高,能为生产提供快速准确的结果。结论本法适用于快速准确测定碳复合磷酸铁锂中总磷含量的。展开更多
基金The National Natural Science Foundation of China(22102194)The Science and Technology Plan of Gansu Province(20JR10RA044)The Youth Innovation Promotion Association of CAS(2022427).
文摘The Co@NC catalysts with different morphologies were prepared by two step process,solvent control growth and pyrolysis method.The polyhedral Co@NC-67P-450 catalyst has a relatively high CoNx content and exhibits excellent phenol hydrogenation activity(conversion 96.9%)at 160℃,3 MPa,which is higher than that of leaf shaped Co@NC-67L-450 catalyst(conversion 75.4%).We demonstrated Co_(3)O_(4)was reduced to the Co^(0)during the reaction.Moreover,CoNx species contribute to the superior hydrogenation activity of phenol.The Co-based catalysts can be easily recovered through the magnetic separation and performed the high stability.
文摘目的本文旨在研究直接除碳重量法测定碳复合磷酸铁锂中总磷含量。方法采用高氯酸分解试样并同时除去样品中的碳后,在酸性介质中,正磷酸根与喹钼柠酮沉淀剂反应生成黄色磷钼酸喹啉沉淀,经过滤、洗涤、干燥、称量,即可求出磷含量。结果高氯酸消解除碳,样品消解完全且清亮,减少了过滤除碳步骤,通过优化条件试验、对该方法进行了精密度和准确度试验,其相对标准偏差(Relative Standard Deviation,RSD)小于0.2%,加标回收率为98.4%~101.1%。该方法最大的优点在于碳在消解过程中直接除去,消除了碳包裹对磷测定的影响,不需要过滤除碳,缩短了操作流程,分析时间短,高含量磷用经典重量法测定,其精密度和准确度高,能为生产提供快速准确的结果。结论本法适用于快速准确测定碳复合磷酸铁锂中总磷含量的。
