A NbO-type metal-organic framework, PCN-46, was constructed based on a polyyne-coupled di-isophthalate linker formed in situ. Its lasting porosity was confirmed by N(2) adsorption isotherm, and its H(2), CH(4) and CO(2) adsorption capacity was examined at 77 K and 298 K over a wide pressure range (0-110 bar).