caa a22 4500 475844696 CHVBK 20180406123910.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1023/A:1019195513430 doi (NATIONALLICENCE)springer-10.1023/A:1019195513430 Formation and reactions of isocyanic acid during the catalytic reduction of nitrogen oxides [Elektronische Daten] [Noel Cant, Dean Chambers, Andrew Cowan, Irene Liu, Atsushi Satsuma] Reactions which can produce and consume isocyanic acid (HNCO) over two types of catalysts active for the reduction of nitrogen oxides have been investigated. More than 1000 ppm HNCO can be produced by the reduction of 3000 ppm NO with H2/CO mixtures over a Pt/SiO2 catalyst. Complete hydrolysis of HNCO to ammonia and carbon dioxide occurs if even weakly catalytic materials, such as CeO2/SiO2 and BaO/SiO2, are placed downstream. Isocyanic acid is also involved as an intermediate in the reaction of nitromethane over Co‐ZSM5 and Cu‐ZSM5 under the conditions of hydrocarbon SCR. In the initial stages of reaction there is complete conversion through to N2 with Cu‐ZSM5 but the process stops at ammonia with Co‐ZSM5 at temperatures below 350°C. In both cases, but especially with Co‐ZSM5, isocyanic acid becomes observable as the catalyst deactivates during continuous exposure at temperatures below about 290°C. In situ FTIR measurements indicate that deactivation is due to a reaction between isocyanic acid and ammonia which generates cyclic s‐triazine compounds. Kluwer Academic Publishers, 2000 isocyanic acid nationallicence nitrogen oxides nationallicence Pt/SiO2 nationallicence hydrolysis nationallicence nitromethane nationallicence deactivation nationallicence Cant Noel Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut Chambers Dean Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut Cowan Andrew Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut Liu Irene Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut Satsuma Atsushi Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 10/1-2(2000-03-01), 13-20 1022-5528 10:1-2<13 2000 10 11244 https://doi.org/10.1023/A:1019195513430 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1019195513430 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cant Noel Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut NATIONALLICENCE 700 1- Chambers Dean Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut NATIONALLICENCE 700 1- Cowan Andrew Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut NATIONALLICENCE 700 1- Liu Irene Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut NATIONALLICENCE 700 1- Satsuma Atsushi Department of Chemistry, Macquarie University, NSW 2109, Sydney, Australia aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 10/1-2(2000-03-01), 13-20 1022-5528 10:1-2<13 2000 10 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer