7 Ti2(SO4)3 + 2 KClO4 + 8 H2SO4 → 14 Ti(SO4)2 + Cl2 + K2SO4 + 8 H2O
This is an oxidation-reduction (redox) reaction:
14 TiIII - 14 e- → 14 TiIV (oxidation)
2 ClVII + 14 e- → 2 Cl0 (reduction)
Ti2(SO4)3 is a reducing agent, KClO4 is an oxidizing agent.