How can I distinguish between Ce4+(CeO2) & Ce3+(Ce2O3) as promoter in the catalysts?

 Dear all,  I already prepared 2 catalysts. First, Pd/Mg1-xCex3+O . Second Pd/Mg1-xCex4+O. How can distinguish between them, which different in Ce species only? the result of XRD & FTIR are...

10 June 2015 1,458 6 View