Oh, it's thallium
. I thought you meant titanium, but were spelling Ti with a capital I. (Especially as you also wrote CE for cerium at first.) Do make an effort to be accurate in typing.
The first two reactions overall give
(though writing it as two reactions implies that it occurs in two steps, not one.)
Combined with the third reaction, the overall process is
Note that there are no Mn species in this equation because you start with Mn2+
and end with Mn2+
(though it gets oxidised to Mn4+
and reduced back to Mn2+
What do you think is the catalyst in all this?