Miniature NH3 cracker based on microfibrous entrapped Ni-CeO2/Al2O3 catalyst monolith for portable fuel cell power supplies

作者：Wang Miaomiao; Li Jianfeng; Chen Li; Lu Yong^*

来源：International Journal of Hydrogen Energy, 2009, 34(4): 1710-1716.

DOI：10.1016/j.ijhydene.2008.11.103

• Microreactor
• Microfiber
• Catalyst monolith
• Hydrogen
• Fuel cells

A miniature ammonia cracker, with an overall weight of approximate to 195 g and volume of approximate to 50 cm(3), has been developed for portable fuel cell power supply. The cracker is composed of a SS-316L tube body, a heating rod and monolithic microfibrous CeO2-promoted Ni/Al2O3 catalysts incorporated within the annular housings between the heating rod and the inner wall of the tubular body. The catalyst monolith is obtained by placing CeO2 and Ni onto the microfibrous carrier consisting of 3.5 vol% 8 mu m diameter nickel fibers and 38 vol% 100-200 mu m Al2O3 particulates through stepwise incipient wetness impregnation method using cerium and nickel nitrate precursors. This cracker shows pleasing operability for high efficiency H-2 production via ammonia cracking with low pressure drop. Roughly 158 W equivalents of H-2 can be produced with ammonia conversion of >99.9% at 600 degrees C and 1100 standard cubic centimeter per minute (sccm) ammonia feed gas rate within this cracker through the entire 300 h test. Power density and energy density are estimated to be approximate to 3160 W/L and approximate to 2150 Wh/kg, respectively.

• 出版日期2009-2
• 单位华东师范大学