Wen Ailian, Cai Zhenlei, Zhang Yimin, Liu Hong
School of Resource and Environmental Engineering, Wuhan University of Science and Technology Wuhan 430081 Hubei Province PR China
State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology Wuhan 430081 China.
RSC Adv. 2022 Apr 29;12(21):13093-13102. doi: 10.1039/d2ra00584k. eCollection 2022 Apr 28.
Vanadium nitride is widely used because of its excellent properties. The existing production methods are affected by the problems of complex preparation for the vanadium source, high temperature, and low N content. In this work, a wide range of vanadium solutions were used as the vanadium source to prepare vanadium nitride with high N content. In this work, a novel precursor was prepared by a microwave-assisted precipitation process, and then the vanadium nitride was prepared by reduction and nitridation precursor at 1150 °C. The results show that in the microwave-assisted method, the particle size and structure of the precursor can be adjusted, so that the contact area of the precursor with N during the nitridation process becomes larger, the N diffusion path becomes shorter, and the formation of vanadium nitride is enhanced. The prepared product has a nitrogen content of 17.67 wt% and is composed of uniform spherical particles. The content of other chemical components and density can achieve the standard requirements specified in VN16. Meanwhile, the thermodynamic analysis showed that the NH generated by the thermal decomposition of the precursor can be used directly as a reducing gas to reduce VO, and reduced the emission of polluting gases. It is a feasible method to prepare vanadium nitride by reduction and nitridation.
氮化钒因其优异的性能而被广泛应用。现有的生产方法受到钒源制备复杂、温度高和氮含量低等问题的影响。在本工作中，使用了多种钒溶液作为钒源来制备高氮含量的氮化钒。在本工作中，通过微波辅助沉淀法制备了一种新型前驱体，然后在1150℃下对前驱体进行还原和氮化制备氮化钒。结果表明，在微波辅助法中，可以调节前驱体的粒径和结构，使得前驱体在氮化过程中与氮的接触面积变大，氮扩散路径变短，增强了氮化钒的形成。制备的产物氮含量为17.67 wt%，由均匀的球形颗粒组成。其他化学成分的含量和密度能够达到VN16规定的标准要求。同时，热力学分析表明，前驱体热分解产生的NH可直接用作还原气体来还原VO，并减少了污染气体的排放。通过还原和氮化制备氮化钒是一种可行的方法。
