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I'm unable to find cerium any reactivity series, hence the question..

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No

The std. electrode potential for Ce3+/Ce is -2.33V, the std. electrode potential for Al3+/Al is -1.66V. This shows that Al is not reactive enough to reduce Ce(III), it is reactive enough to take Ce(IV) to Ce(III) so I think you would get a mixed salt of Ce/Al sulfate.

This reference here states that calcium metal is used with cerium fluoride as a preparative method.

Note: you can't do this in aqueous solution. Your reactive metal will react with the water preferentially.

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  • $\begingroup$ Is it possible to simply add a highly reactive metal like aluminium to a solution of ceric sulphate? Forgive me is this question sounds silly but I'm new to chemistry. $\endgroup$ Nov 23, 2018 at 15:57
  • $\begingroup$ The electrode potentials show that Aluminium is not reactive enough to reduce Cerium. It requires metal with electrode potential below -2.33V. Potassium, Sodium and Lithium would do it in addition to Ca. Ce has a reactivity close to Magnesium (-2.37V). Also note; you can't do this in aqueous solution. Your reactive metal will react with the water preferentially. $\endgroup$
    – Waylander
    Nov 23, 2018 at 16:01
  • $\begingroup$ Not to mention that sulfates would get reduced to sulfides in the presence of such powerful reducing agents. That is wasteful of your reducing agent. $\endgroup$ Nov 23, 2018 at 21:34
  • $\begingroup$ Thanks! May I know if it is possible to use electrolysis to extract cerium? $\endgroup$ Nov 24, 2018 at 2:01
  • $\begingroup$ @mayur-sharmila yes it is. The reference I quoted in the answer mentions electrolysis of cerium chloride as a preparative method. If you are happy with the answer, please accept it. $\endgroup$
    – Waylander
    Nov 24, 2018 at 8:45

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