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

摘要:

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Ce³⁺和CA的螯合和聚酯，形成稳定的Ce³⁺-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CeO₂/C粉末促进了CeO₂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。

Abstract:

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 Ce³⁺ and CA to form stable Ce³⁺-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 CeO₂/C powder, promoting the close contact between CeO₂ and C. The diffusion distance between the atoms of Ce and C sources is reduced to facilitate the carbothermal reduction nitridation process.