The present invention relates to a facile synthetic method to synthesize novel hexagonal phase CuCo (HCuCo) PBAs with high crystallinity, as well as extended synthesis of doping PBAs with hexagonal phase: Fe.sub.0.1CuCo, Fe.sub.0.2CuCo, Co.sub.0.1CuCo, Ni.sub.0.1CuCo, and Zn.sub.0.1CuCo. The hexagonal phase HCuCo PBAs and the doping sequence of PBAs with hexagonal phase exhibit superior crystallinity and significantly higher intrinsic specific surface area. Meanwhile, HCuCo PBAs show great potential for gas adsorption and have a positive impact on the development of PBAs for other applications.