标题： 重质焦油（甲苯和萘）对以生物合成气为燃料的阳极支撑型固体氧化物燃料电池电化学性能的影响 显示英文标题

标题： The effect of heavy tars (toluene and naphthalene) on the electrochemical performance of an anode-supported SOFC running on bio-syngas

摘要： 重质焦油化合物对Ni-YSZ阳极支撑型固体氧化物燃料电池性能的影响进行了研究。 甲苯和萘被选为模型化合物，并与模拟生物合成气分别进行测试。 值得注意的是，当使用纯H2作为SOFC燃料时，萘的影响几乎可以忽略不计，而当使用H2:CO=1的生物合成气时则观察到严重的性能退化。 焦油化合物显示出对WGS变换反应的显著抑制作用，可能也对三相边界处CO的直接电氧化产生影响。 萘在镍催化和电催化活性位点上的吸附相互作用可能是观察到的性能退化和严重性能损失的合理解释。 H2和CO的电氧化以及催化水煤气变换反应似乎涉及不同的位点。 最后，重质焦油（C>=10）必须被视为SOFC应用中的毒物而非燃料，这与苯或甲苯等较轻的化合物相反，后者可以在阳极电极内直接重整。 萘的存在会显著增加合成气流中阳极再氧化的风险，因为CO转化为H2受到抑制，同时CH4的转化也被阻断。 显示英文摘要

摘要： The effect of heavy tar compounds on the performance of a Ni-YSZ anode supported solid oxide fuel cell was investigated. Both toluene and naphthalene were chosen as model compounds and tested separately with a simulated bio-syngas. Notably, the effect of naphthalene is almost negligible with pure H2 feed to the SOFC, whereas a severe degradation is observed when using a bio-syngas with an H2:CO = 1. The tar compound showed to have a remarkable effect on the inhibition of the WGS shift-reaction, possibly also on the CO direct electro-oxidation at the three-phase-boundary. An interaction through adsorption of naphthalene on nickel catalytic and electrocatalytic active sites is a plausible explanation for observed degradation and strong performance loss. Different sites seem to be involved for H2 and CO electro-oxidation and also with regard to catalytic water gas shift reaction. Finally, heavy tars (C>=10) must be regarded as a poison more than a fuel for SOFC applications, contrarily to lighter compounds such benzene or toluene that can directly reformed within the anode electrode. The presence of naphthalene strongly increases the risk of anode re-oxidation in a syngas stream as CO conversion to H2 is inhibited and also CH4 conversion is blocked.