For The Production Of FC Hydrogen From Methane As A Catalyst For The Design And Improvement

Proton exchange membrane fuel cells(PEMFC) fired hydrogen is a new energy system. It produces heat and generates electricity through chemical reactions of the hydrogen and oxygen or air, and the thing discharged into the environment is only water. Because of the abundant resources , high hydrogen content and the transmission and distribution network in all directions, methane in the manufacture of hydrogen for fuel cells have a very real significance. The partial oxidation of methane is not only in the use of resources environmental protection, furthermore, it will enable the hydrogen production process simplification, and reduce production costs.The POM of methane is a new way for the development of hydrogen used by fuel cell.In this paper, we have a systematic study for the process and reaction mechanism of the POM ,and give a suggest that make use of the POM with air and methane for achieving the hydrogen source used by PEMFC. We have a design and improvement of the catalyst in the partial oxidation of methane, and have a experiment to determine the relevant parameters in the flow.POM in the reaction process use air instead of oxygen in a fixed-bed reactor for the experimental evaluation of catalyst. Experimental results show : Ni-based catalyst system, theγ-Al₂O₃ as the carrier and La as a catalyst additive in the nickel content in 8% around with the best reaction;La additives can make the temperature lower under the POM and trigger the response of NiO to Ni0.The content of La around 5% can't only trigger the POM reaction,but also guarantee the high activety of the catalysts .As a series of testing for the mix ratio of element and their activity, Ca-Ce-Ni-La/Al₂O₃ catalyst in the bed temperature of 800℃, the space velocity of 6L·g^-1·h^-1, air/CH4 between 3.0³.5 has higher activity and anti-coking capacity.As temperature increasing, the conversion of methane increases, but the selectivety of H₂ remain hardly increase at 800℃. The increase of temperature will produce sintered catalyst ,bring evaporation loss and lower efficiency. The catalyst reactivities are close before and after dilution, but quartz sand is slightly better than Al₂O₃ dilution.