金属-有机骨架化合物为前驱体制备CuO/CeO2催化剂及在富氢条件下催化CO的氧化
摘要
Employing metal-organic frameworks (MOFs) as precursors, a series of CuO/CeO_2 catalysts was prepared and applied for CO-PROX(preferential oxidation of CO) in H_2-rich stream. Compared with previously reported A-600 catalyst[A-600 catalyst was obtained by thermal treatment of the Cu_3(BTC)_2 precursors with Ce^(3+) ions, the calcination temperature was selected to be 600˚C for removing the organic species], we can conclude that different precursors lead different catalytic activity. The X-ray diffraction, temperature-programmed reduction in H_2(H_2-TPR), transmission electron microscope and X-ray photoelectron spectroscopy analysis characterization indicated the as-synthetic catalysts presented more bulk CuO species on the surface than that of the A-600 catalyst, which resulted in the negative catalytic activity for preferential CO oxidation. But this also prevented the deactivation of catalysts in H_2O and CO_2 steam, indicating that the catalysts were promising in the CO-PROX process for proton exchange membrane fuel cell (PEMFC) application.