Abstract
The properties of flowerlike microspheres ceria based nickel catalyst for low temperature methane steam reforming (SMR) were studied. The ceria microspheres were prepared by hydrothermal method. Catalyst of nano-sized nickel oxide particles based on flowerlike cerium oxide microspheres with high disperse were prepared to achieve simultaneous dehydrogenation of methane and water molecules on multi-active sites. The catalyst was characterized by means of Scanning Electronic Microscope (SEM), X-ray diffraction (XRD). Results showed that this special catalyst NiO/CeO2 had high activity and stability for SMR reaction below 600oC. The stability of the catalyst reached more than 1000 hours. The conversation of methane under 590oC was above 90%. The tests of the influence of different H2O/CH4 mole ratios on activity and selectivity of catalyst showed that 1.5~2.5 ratios was an ideal choice. During the running of micro-tube methane steam reformer with this catalyst, the methane conversion of 556oC kept over 25mol.%.
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