摘要
以氧化钇稳定的氧化锆(YSZ)做电解质,氧化钪稳定的氧化锆(Ni-ScSZ)为阳极,研究了不同浓度干甲烷在固体氧化物燃料电池阳极上的氧化行为。改变甲烷浓度,利用色谱在线测量不同电流密度下阳极出口气体产生的种类与速率。通过氧的分析与反应发生时的电子数分析,研究了干甲烷在Ni-ScSZ阳极的氧化行为,并对比研究了相同浓度的干甲烷在Ni-YSZ阳极上的氧化行为。结果表明,在Ni-ScSZ阳极上,高浓度干甲烷与在Ni-YSZ阳极上类似,由甲烷裂解反应生成的碳发生氧化反应生成CO;低浓度干甲烷在电流密度较低的情况下,在1 000℃可发生CO氧化反应,生成CO2。在Ni-YSZ阳极上,低浓度干甲烷在较高电流密度下,在生成CO2的同时甲烷发生完全氧化反应。
The oxidation behaviors of variety concentration dry methane were stualea over tne anoae of solid oxide fuel cell （SOFC） with Ni/scandia-stabilized zirconia （ScSZ） anode and yttria stabilized zirconia （YSZ） electrolyte. The production rates of different gases at anode outlet were measured at different current density by on-line gas chromatograph under varied methane concentrations. The oxygen from cathode and the amounts of electron number were analyzed to find the different anode reaction and the oxidation behavior for the two different anodes for varied methane concentration. The oxidation behaviors of similar concentration dry methane were also studied over Ni-YSZ anode for contrast. The results showed that the carbon which come from methane decomposition reaction was reaction with oxygen ion to form CO for high concentration dry methane over Ni-ScSZ, which was same as the oxidation behavior of high concentration dry methane over Ni-YSZ. CO may be oxidized to CO2 directly for low concentration dry methane over Ni-ScSZ anode with low current density at 1 000 ℃. Over Ni-YSZ anode, direct oxidation of methane （DOM） took place at high current density when CO2 formed for low concentration dry methane.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2009年第3期216-222,共7页
Chemical Reaction Engineering and Technology
