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In a recent letter [J. Phys. A26, L801 (1993)], Yaldram et al. studied thecritical behaviour of a simple lattice gas model of the CO-NO catalyticreaction. The model exhibits a second order nonequilibrium phase transitionfrom an active state into one out of infinitely many absorbing states.Estimates for the critical exponent $\beta$ suggested that the model belongs toa new universality class. The results reported in this article contradict thisnotion, as estimates for various critical exponents show that the model belongsto the universality class of directed percolation.Comment: 10p+5fig, LaTeX+fig in uuencoded P

Critical behaviour of a surface reaction model with infinitely many absorbing states