I want to compare the number of pores/cm2 of different materials but can't find a way to do it for different materials such as Zeolites, ceramics, MOFs etc
I belive you need the pore size for this. Moreover, you ask about the number of pores on the surface but in the case of zeolites, MOFs and other 3D-strictures with complex volume porosity, this parameter will look strange.
I am afraid that you CANNOT calculate the number of pores per external surface area from adsorption isotherm data (which you refer to as BET, although that is but one of many isotherm models). One can calculate pore diameter from isotherms, but even if your material had very ordered porosity, you would be missing a very important parameter: wall thickness. I agree with Sergei that this is an unusual parameter for materials characterization, but if your really need it, your best option in this case would perhaps be electron microscopy imaging.
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