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The effect of heavy tar compounds on the performance of a Ni-YSZ anodesupported solid oxide fuel cell was investigated. Both toluene and naphthalenewere chosen as model compounds and tested separately with a simulatedbio-syngas. Notably, the effect of naphthalene is almost negligible with pureH2 feed to the SOFC, whereas a severe degradation is observed when using abio-syngas with an H2:CO = 1. The tar compound showed to have a remarkableeffect on the inhibition of the WGS shift-reaction, possibly also on the COdirect electro-oxidation at the three-phase-boundary. An interaction throughadsorption of naphthalene on nickel catalytic and electrocatalytic active sitesis a plausible explanation for observed degradation and strong performanceloss. Different sites seem to be involved for H2 and CO electro-oxidation andalso 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 directlyreformed within the anode electrode. The presence of naphthalene stronglyincreases the risk of anode re-oxidation in a syngas stream as CO conversion toH2 is inhibited and also CH4 conversion is blocked.

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