Extraction of Nanosized Cobalt Sulfide from Spent Hydrocracking Catalyst

Table 4

Data used for the simulation of the cobalt oxalate sulfide intermediate.

Structure	Name	Energy (KJ/mol)	Simulated visible absorption Wavelength
	Carboxy arbonyloxy mercapto (cobalt intermediate)	−1188.7	582.49 nm
	Cobalt oxalate	−919.04	382.84 nm
	Cobalt sulfide	−1911.836	—

The red shifted wavelength of the intermediate indicates that it is responsible for the change in color from violet to red.