Ioy. Liu et al., The formation of HCN during the reduction of NO by isobutane over Fe-MFI made by solid-state ion exchange, CATAL LETT, 63(3-4), 1999, pp. 241-244
FTIR analysis of the gaseous products of the selective catalytic reduction
of NO by isobutane over a Fe-MFI catalyst made by solid-state ion exchange
shows, for the first time, that HCN can be a substantial product. Under dry
conditions the amounts formed can exceed that of N-2 for temperatures up t
o 280 degrees C and NO conversions of 25% with a maximum HCN concentration
of similar to 150 ppm formed at 315 degrees C. However, introduction of 0.7
% water causes the subsequent conversion of about one-half the HCN to N-2,
probably through hydrolysis to NH3 and the NH3-SCR reaction which is very r
apid on Fe-MFI. The steps through which HCN forms remain to be established.