Solid oxide fuel cell (SOFC) is of advantages of high efficiency

low pollution

flexibility of usable fuel types and high power

etc.Its performance and work condition is strongly affected by electro-chemical reactions coupling with various kinds of transport processes occurring in the porous anode.In this work

a 3D model is developed to describe the coupling processes based on a in-house code program.A mechanism with 42-step elementary reactions was used to evaluate the catalytic surface reaction taking place in porous anode of SOFC.The results indicate that reforming reaction providing H2 and CO for electrochemical reaction consumes heat produced by electrochemical reaction and occur mainly in near inlet side of anode.The 70% to 80% of surface coverage in anode is covered by Nis

20% to 25% by COs

6% by Hs and 1.5% by Os

and it is also found that the low utilization of Nis catalytic surface means in sufficient usage of fuel.The coverage of surface species depends on operating temperature

Nis coverage increases with increasing temperature while Hs

COs and Os decrease.Reaction rate constant can affect specific coverage and operation temperature in some degree

higher rate constant of elementary reaction can make increase fuel consumption and operation temperature.So

it is possible to go up the utilization rate of fuel by improving some steps in elementary reactions.Gas transport is improved by increasing permeability that can not enhance catalytic surface reaction.