溶胶-凝胶法辅助碳热还原氮化反应制备CeN粉末

Carbothermal Reduction Nitridation Reaction Assisted by Sol-Gel Method for CeN Powder Preparation

以柠檬酸(CA)为螯合剂,即以有机物为碳源,通过溶胶-凝胶法辅助碳热还原氮化反应制备了CeN粉末。整个反应过程分为水相过程和热处理过程。水相过程主要是Ce^(3+)和CA的螯合和聚酯,形成稳定的Ce^(3+)-CA螯合物前驱体。通过水相过程实现Ce源与C源在分子水平上的均匀混合。热处理过程包括原位碳化和碳热还原氮化反应两部分。原位碳化过程形成的CeO_(2)/C粉末促进了CeO_(2)和C之间的紧密接触,从而减少Ce源和C源原子的扩散距离,以促进碳热还原氮化过程。

CeN powder was prepared through the carbothermal reduction nitridation reaction assisted by sol-gel method.Citric acid(CA)was used as the chelating agent,indicating that the organic material is used as the carbon source.The whole process could be divided into an aqueous phase process and a heat treatment process.The aqueous phase process mainly involved the chelation and polyester of Ce^(3+)and CA to form stable Ce^(3+)-CA chelate precursors.Homogeneous mixing at the molecular level of Ce and C sources could be achieved by the aqueous phase process.The heat treatment process included the in-situ carbonization and carbothermal reduction nitridation reaction.The in-situ carbonization process formed CeO_(2)/C powder,promoting the close contact between CeO_(2)and C.The diffusion distance between the atoms of Ce and C sources is reduced to facilitate the carbothermal reduction nitridation process.