Vanadium ratio to nickel

The catalysts used in the pilot unit are both equilibrium catalysts from the FCCU at the Statoil Mongstad refinery, and impregnated and deactivated fresh catalysts from different vendors. The catalysts have been impregnated with nickel and vanadium naphthenates. The amount of metals has varied over the years, but the nickel to vanadium ratio has usually been 2 3. The deactivation procedure has also changed over the years, as new deactivation methods have been developed and existing deactivation methods have been improved. 

The catalysts were calcined at 600°C for 2 hours, and impregnated with nickel and vanadium naphthenates according to Mitchell [14] with a nickel to vanadium ratio... 

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