1-point-BET, adsorption, active metal surface, BET analysis, BET measurement, chemisorption, vapor adsorption, desorption isotherm, characterisation of catalyst, surface analysis, particle analysis, physisorption, pore analysis, pore size, distribution, porosity, pulse adsorptiion, sorption measurment, specific surface, tpd, tpo, tpr, macro-porous, meso-porous, micro-porous