“…A number of technology development efforts are focused on the simultaneous control of SO, and NO, (Roberts, 1993;Denker, 1993;Gottschlich et al, 1993;Gordon, 1993;Black etd., 1993;Zamansky et al, 1993;Gangwal and Silveston., 1993). Again, in these development efforts, only a few projects anticipate achieving SO, control levels of > 95 % .…”