Recycling of manganese ore desulfurization slag for preparation of low-temperature NH3-SCR catalyst with good scale-up production performance

Yuzhu Yang; Runqing Wang; Jie Liu; Yujin Peng; Zhongde Dai; Wenju Jiang; Lu Yao; Lin Yang

doi:10.1016/j.jhazmat.2024.133988

Recycling of manganese ore desulfurization slag for preparation of low-temperature NH₃-SCR catalyst with good scale-up production performance

J Hazard Mater. 2024 May 5:469:133988. doi: 10.1016/j.jhazmat.2024.133988. Epub 2024 Mar 7.

Authors

Yuzhu Yang¹, Runqing Wang¹, Jie Liu², Yujin Peng³, Zhongde Dai², Wenju Jiang², Lu Yao², Lin Yang⁴

Affiliations

¹ College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China.
² College of Carbon Neutrality Future Technology, Sichuan University, Chengdu 610065, PR China; National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, PR China.
³ College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China; National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, PR China.
⁴ College of Carbon Neutrality Future Technology, Sichuan University, Chengdu 610065, PR China; National Engineering Research Center for Flue Gas Desulfurization, Chengdu 610065, PR China. Electronic address: evanlinyang@sina.com.

PMID: 38461663
DOI: 10.1016/j.jhazmat.2024.133988

Abstract

Considering the synergistic carbon/pollution reduction and resource utilization, this study proposes recycling of manganese desulfurization slag to prepare low-temperature NH₃ -SCR catalyst based on solid-state ion-exchange. The desulfurization slag was hydrothermally treated to be support under mild conditions, with the parent manganese oxide ore serving as active component. Hydrothermal treatment with a desulfurization slag to NaOH mass ratio of 1.0, at 100 °C for 10 h were actually cost-effective conditions for DS recycling. The catalyst with 13.6 wt% of Mn and activated at 450 °C for 2 h in air (MO3/DSH-450 -2) performed the best, with a NO conversion of 86.9% at 150 °C and 10000 h^-1, and up to 92.6% at 175 °C. Hydrothermal treatment of DS, SSIE and calcination activation resulting in a rich surface acidity and lattice oxygen of MO3/DSH, coupled with better chemical state distribution of active metal sites, promoting the NH₃ -SCR activity. The scale-up produced MO3/DSH-G maintained 90.4% NOx conversion at 175 °C, showing good robustness, flexibility, and better sulfur/water resistance. The development of MO3/DSH catalyst may make full use of natural manganese ore, is a typical coupling strategy for carbon-pollutant synergistic emission reduction and resource fully utilize.

Keywords: Hydrothermal treatment; Manganese ore desulfurization slag; NH(3)−SCR catalyst; Resource utilization; Scale-up production.