With the increase in environmental awareness, the disposal of any form of hazardous waste
has become a great concern for the industrial sector. Spent catalysts contribute to a …

With the continuous development of industrialization and the depletion of ore resources, the
recovery of valuable metals from spent catalysts has attracted the attention of researchers …

Spent hydrodesulfurization (HDS) catalysts, containing considerable amount of pollutants
and metals including vanadium (V), molybdenum (Mo), aluminum (Al), and nickel (Ni), are …

Catalysts are widely used in petroleum refining and chemical industries. Among secondary
resources, spent catalysts are undoubtedly very important because of not only their large …

Recovery of valuable metals such as cobalt, molybdenum, nickel, and vanadium from spent
catalysts has attracted much attention owing to the gradual depletion of high-grade ores. In …

Petroleum refineries must pay attention to spent hydroprocessing catalysts particularly since
they are hazardous toxic wastes. This review focuses on the progress in metal reclamation …

Research on biohydrometallurgy of secondary metal resources is primarily focused on the
leaching of valuable metals. For secondary metal resources biological processing can be an …

Abstract Molybdenum (Mo) and rhenium (Re) are strategic key metals for the development of
modernization. In nature, 99 wt.% of Re is associated with molybdenite minerals via the form …

Effective recovery of elements from spent catalysts can not only avoid environmental
hazards, but also alleviate the pressure of resource scarcity. This study proposes a …

A large amount of spent selective catalytic reduction (SCR) catalyst is generated annually.
The spent SCR catalyst is poisoned by arsenic and alkaline metals. These spent catalysts …