| http://www.w3.org/ns/prov#value | - NiMo and CoMo/Al2O3 are typical examples of spent catalysts coming from hydrotreating (HDT) units.4-6 The lifetime of the catalysts tends to decrease due to the more severe operations required.3,4,7 Catalyst deactivation is basically due to coke and metals deposition over its surface.
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