(CH3)(2)NH-Assisted Synthesis of High-Purity Ni-HKUST-1 for the Adsorption of CO2, CH4, and N-2

Ni-HKUST-1, with the same topological structure as Cu-BTC (HKUST-1), was synthesized by a (CH3)(2)NH-assisted method. Ni-HKUST-1 with high purity (> 90%), yield (85%), and BET surface area (1088 m(2)/g) was successfully synthesized for the first time by using NiCl2. The pure-component adsorption isotherms of CO2, CH4, and N-2 on Ni-HKUST-1 were measured by the volumetric method and the data used to estimate the separation selectivity for CO2/CH4, CH4/N-2, and CO2/N-2 binary mixtures according to the ideal adsorbed solutions theory. At 273 K and 1 atm, the selectivities for CO2/CH4, CH4/N-2, and CO2/N-2 were 14.49, 5.36, and 183.41, respectively, and the adsorption capacities for CO2 and CH4 were 223.87 and 67.89 cm(3)/g, respectively. This is a rare demonstration of both high selectivity and adsorption capacity in the separation of CO2, CH4, and N-2.