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 …

Petroleum refineries are known to generate huge quantities of spent hydroprocessing
catalysts as solid waste every year. Spent hydroprocessing catalysts contain significant …

Ammonia leaching can achieve selective recovery of nickel and molybdenum without
aluminum extraction from spent hydrodesulfurization catalyst. In this study, a method for …

Spent catalysts generated from various processing industries such as those involved in the
hydrogenation of fats and oils pose severe environmental issues if not treated and disposed …

Spent hydrodesulfurization (HDS) catalyst contains considerable amounts of Mo, Ni and V,
is an important secondary resource for these valuable metals. Direct acid solution leaching …

There has been a substantially increasing demand for energy critical elements (ECEs) in
recent years as energy-related technology has advanced rapidly. Spent catalysts are known …

N-doped carbon nanomaterials containing certain transition metals have recently attracted
significant interest as the promising noble-metal-free composites for a variety of applications …

The depletion of primary metal sources and the extensive use of nickel necessitate its
extraction from secondary resources. In this study, we employed a chloride-based solution …

While spent catalysts can cause serious environmental pollution, they can be considered an
essential secondary metal source due to their high critical metal grades. The formation of the …

The improvement in the leaching rate of Ni, V, Mo, and Al present in a spent catalyst sample
was evaluated by the bacterial adaptation technique. For this purpose, leaching of the …