Cyanuric acid + nitric oxide reaction at 700°C and the effects of oxygen

✍ Scribed by Brian G. Wicke; Karen A. Grady; John W. Ratcliffe

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 536 KB
• Volume: 78
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(89)90129-6

✦ Synopsis

The reaction of cyanuric acid, (HNCO)3, with nitric oxide has been examined in a flow tube under conditions similar to those initially reported for RAPRENOx. Surface interactions are shown to play an important role in the observed chemistry. In a quartz flow tube at 700"C, (HNCO)3 decomposes slowly; addition of nitric oxide does not affect the (HNCO)3 decomposition, and no NO reduction occurs. In an otherwise equivalent stainless-steel flow system, (HNCO)3 decomposes rapidly to H2, CO, and N2 at 700"C. In this stainless-steel flow tube, NO is efficiently reduced to N2 by (HNCO)3. At 700"C, the stoichiometry of this fast chemistry is 2 (HNCO)3+9 NO--,3 H20+7.5 N2+6 CO2 02 also reacts rapidly with (HNCO)3 vapor at 700"C in stainless steel. The dominant nitrogen-containing product of this reaction is NO. This reaction of (HNCO)3 vapor with 02 is faster than the corresponding reaction with NO.

Under conditions examined here in stainless steel, reduction of NO by (HNCO)3 in the presence of 02 occurs only after the 02 is consumed.