Abstract
The utilization of spent catalysts as raw materials in the production of a wide range of commercial products is an attractive option for their recycling from both environmental and economic points of view. In this regard, construction materials, e.g., cement, concrete, etc.; water treatment applications; abrasive materials; and synthetic aggregates have been receiving attention. Other useful materials prepared from spent hydroprocessing catalysts include fused alumina, synthetic aggregates, anorthite glass-ceramics, refractory cement, and refractory brick.
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