Abstract
Copper (5wt.%) supported on ceria nanopolyhedra, nanorods and nanocubes was studied as catalyst for hydrogen production from partial oxidation of methanol (POM). Supports were prepared by hydrothermal approach and addition of copper was achieved by wet impregnation. Catalysts were characterized by EDS, XRD, TEM, HRTEM, N2 adsorption, H2-TPR, N2O Chemisorption, CH3OH-TPD, Raman and DRIFT spectroscopies. POM reaction was studied at O2/CH3OH molar ratio of 0.3 as a function of temperature in the range 160–280°C and as a function of time on stream for 24h at 265°C. As a result of the support morphology the following features were observed: (i) variety of copper species on the surface of the nanoshaped ceria; (ii) different capability and stability of carbonate formation; (iii) desorption of products from CH3OH-TPD at different temperatures; (iv) activity, selectivity and stability variations in the POM reaction related to oxidation state of the copper phase. At constant temperature, polyhedra and rod-like catalysts show similar performance, but the former one produces lower amounts of CO.
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