particle surface reaction

ardeshiri

I want to use particle surface reaction with species transport combustion to mode reduction of iron oxides like this: fe2o3+3h2=2fe+3h2o but i cant find solid fe2o3,in the material list in the set injection properties panel. So my question is this can I define this combustion particle fe2o3 in DPM? and how i can use this solid fe2o3, for difine the reaction in species transport combustion? thanks so much....