Plz help! I can't express this reaction in fluent

chang,antony

hi everyone...

the reaction equaiton that i'm applying to fluent is below

r=k0 Ca Cb / {(1+k1 Ca + k2 Cb)(1 + k3 Ca + k4 Cb)}

I look into the fluent manual for the way to use this reaction equation but i couldn't find it.. I thought this is related to Modeling Surface Chemistry(13-46) but what the manual used are the activation energy & pre-exponential factor and and in the tutorial guide vol2 there used step7 solution for three-step reaction case.. but I can't adapt my reaction equation to this example of manual.

so is there anybody who would like to help me?

thank you reading this..