Study On Catalyst Of Steam Reforming With Methane For DIR-MCFC

Molten carbonate fuel cell working at 650℃falls into the general category of high temperature fuel cell. Because of its many advantages, e.g., no need of noble metals as electrode catalysts, combined heat and power generation (CHP) and very high electrochemical conversion efficiency, MCFC will be the best one of civilian power generations in the near future. Pure hydrogen is nonessential fuel for MCFC, so the one produced by methane reforming can be put to use by MCFC. Therefore, MCFC combines with methane reforming technology of hydrogen production constitute the direct internal reforming molten carbonate fuel cell (DIR-MCFC). DIR-MCFC realizes the double coupling between energy and matter.:the high temperature is used by reforming reaction, which realizes energy coupling; the hydrogen produced by reforming reaction go to electro catalyst where the electrochemical reaction occurs, which consumes hydrogen and serves to accelerate the reforming reaction, and the steam produced by electrochemical reaction is able to improve the reforming reaction, therefore matter coupling can be realize.The influence of the factors such as preparation method, sintering temperature and content of active component on performance of the reforming catalyst was investigated, and the best technical parameter was provided. Then the effects of different contents of the rare-earth element Ce and La on the properties of the reforming catalyst was studied, and the catalyst 15Ni1.5Ce1.5La/Al2O3 was selected to be tested for activity, anti-carbon ability and stability out of the cell in order to determine whether it can be used in MCFC.The properties of DIR-MCFC employed the reforming catalyst 15Ni1.5Ce1.5La/Al2O3 was studied. The results indicated DIR-MCFC had the output of high current constantly and steadily, which meant it was feasible for the catalyst to be used in DIR-MCFC.The influence of the assembly mode and discharge quantity and pressure in cell and steam-carbon-radio (S/C) and space velocity on performance of the reforming catalyst in DIR-MCFC was studied. Results show that DIR-MCFC assembled as "anode-cathode" displayed the better property; the reforming reaction was inhibited in the wake of the increase of the discharge quantity; because of the avail mass transfer, high pressure was able to enhance the performance of DIR-MCFC, but meanwhile gone against reforming reaction; low S/C, the property of DIR-MCFC was improved, but reforming reaction was restrained and the carbon deposition come into being in surface of the reforming catalyst; high space velocity was helpful to enhance the performance of DIR-MCFC, but not benefit for improvement of methane conversion.Nonetheless, the performance of the reforming catalyst dropt because of alkali poison and the resistance of alkali poison were improved by coated with an alkali-resistant membrane.