Functionalization strategy influences the porosity of amino-containing porous aromatic frameworks and the hydrogenation activity of palladium catalysts synthesized on their basis

•PAFs were modified with -NH2 groups via post- and pre-functionalization methods.•Synthesized PAF-NH2 were used for the immobilization of Pd NPs.•Morphology and distribution of Pd NPs depended on the chosen modification method.•Catalysts based on post-modified PAF-NH2 demonstrated higher activity.•PAF-NH2-pre improved catalyst stability and selectivity towards target olefins.