MOF-74(Ni) was synthesized by solvothermal synthesis method and then characterized by PXRD and pore size analysis. Isotherms of C3H6 and C3H8 on the synthesized MOF-74(Ni) were measured at different temperatures. The temperature programmed desorption experiments were conducted to estimate the desorption activation energies of C3H6 and C3H8 on the MOF-74(Ni). IAST theory was applied to predict the adsorption selectivity of C3H6/C3H8 mixture. The effects of temperature on adsorption mechanism and adsorption selectivity were also discussed. Results showed that the as-synthesized MOF-74(Ni) had BET surfaces of 1306 m2·g-1

and its C3H6 adsorption capacity was up to 7.4 mmol·g-1 at 298 K. With rising temperature

the adsorption capacity of C3H8 on MIL-74(Ni) decreased sharply

while that of C3H6 decreased slightly

resulting in improvement of C3H6/C3H8 adsorption selectivity of MOF-74(Ni). It could be attributed to p-complexation bonding between C3H6 and MOF-74(Ni)

which was stronger than the interaction of C3H8 with MOF-74(Ni). TPD results indicated that the desorption activation energy of C3H6 on MOF-74(Ni) was higher than that of C3H8

which were 68.92 kJ·mol-1 and 50.80 kJ·mol-1

respectively.