Without seeing the document and only a single example to work with, it is hard to judge, but the following macro should help fix any that match your example.
Code:
Sub AddSuperscript()
Const strFind As String = "[a-z][0-9]{1,}>"
Dim orng As Range
Set orng = ActiveDocument.Range
With orng.Find
Do While .Execute(FindText:=strFind, MatchWildcards:=True)
orng.Start = orng.Start + 1
orng.Select: DoEvents
If MsgBox("Replace " & orng.Text, vbYesNo) = vbYes Then
orng.Font.Superscript = True
End If
orng.Collapse 0
Loop
End With
Set orng = Nothing
End Sub