Prepare a catalyst consist of rare earth minerals to denitrate via NH 3 -SCR

Green Processing and Synthesis

article

Jian Wang¹  Chao Zhu¹  Baowei Li²  Zhijun Gong¹  Zhaolei Meng¹  Guodong Xu¹  Wenfei Wu¹ 

[1] School of energy and environment, Inner Mongolia University of Science and Technology;Key Laboratory of Integrated Exploration of Bayan Obo Multi-Metal Resources

关键词: denitrification;    rare earth concentrates;    rare earth tailings;    microwave;    catalysis;   

DOI  :  10.1515/gps-2020-0020

来源: De Gruyter

【 摘 要 】

To research the roles of rare earth minerals in denitrification via the NH 3 -SCR, a mixture was made by certain ratio of rare earth concentrates and rare earth tailings, then treated by microwave roasting, and acids and bases to form a denitrification catalyst. The mineral phase structure and surface morphology of the catalyst were characterized by XRD, BET, SEM and EDS. The surface properties of the catalyst were tested by TPD and XPS methods, and the denitrification activity of the catalyst was evaluated in a denitrification reactor. The results showed that the denitrification efficiency increased up to 82% with complete processing. XRD, BET, SEM, and EDS spectrum analysis stated that the treated minerals contained cerium oxides and Fe−Ce composite oxides. The surface of the modified minerals became rough and porous, the surface area increased, and the surface-active sites were exposed. The results of NH 3 -TPD and NO-TPD showed that the catalyst surface could gradually adsorb more NH 3 and NO after each step. XPS analysis indicated that there were more Ce 3+ , Fe 2+ , and lattice oxygen in rare earth minerals catalyst after each treatment step.

【 授权许可】

CC BY