Journal
HYDROMETALLURGY
Volume 187, Issue -, Pages 45-53Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2019.05.003
Keywords
Scrapped SCR catalyst; Cleaner hydrometallurgical recovery; Arsenic removal reaction; Restructure; Ctalyst regeneration
Categories
Funding
- National Natural Science Foundation of China [51674230, 51761135108]
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China generates a large number of scrapped selective catalytic reduction (SCR) catalysts in the fossil fuel combustion plants every year. As a result, there is a giant quantity of 5 x 10(5)t scrapped V2O5-WO3/TiO2 SCR catalyst annually worldwide, in which arsenic poisoning is a major cause of catalysts deactivation. In this study, a novel cleaner recovery process of alkaline-acid stepwise leaching was proposed for the high-arsenic scrapped SCR catalysts to achieve excellent arsenic removal and structural reforming. It is found that arsenic can be completely removed from 1.92% to below the detection limit, and the surface area of regenerated catalysts is restored to 31 m(2)/g (similar to that of commercial catalysts). In the subsequent pickling and regeneration, Na+ can be eliminated to obtain anatase-type TiO2 for further activity recovery. Besides, valuable elements (W, V) have been successfully recycled by leaching the As-containing solid waste with ammonium salt. After replenishing active components, regenerated catalyst exhibits comparable activity with the commercial fresh catalyst, offering a promising method for scrapped catalyst recovery and further understanding of cleaner produces for waste management.
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