Isocyanate formation and reactivity on a Ba-based LNT catalyst studied by DRIFTS

- Isocyanate formation and reactivity was studied on a model LNT catalyst.
- According to DRIFTS data, Ba-NCO is derived from the reduction of Ba(NO3)2 by CO.
- Subsequent reaction of isocyanate with residual nitrates is slow.
- During dry lean-rich cycling, N2 mainly formed via the reaction of NCO with NO/O2.
- H2O is the most reactive species toward isocyanate of those tested.