This paper reports the first online gas phase detection of absolute concentrations of HONO under engine relevant conditions, during the oxidation of an alkane in the presence of NO_x. The detection was achieved at laboratory scale thanks to the coupling of a jet-stirred reactor to a continuous-wave Cavity Ring-Down Spectroscopy cell. The evidence of the formation of HONO was obtained by comparing measured cw-CRDS spectra with a literature one. The formation of HONO was simultaneously observed with the appearance of another nitrogen compound: NO₂. This confirms that HONO could also be formed from NO₂ under engine conditions.

中文翻译：

---

首次发现燃料+ NO系统氧化中的关键中间体：HONO

本文报道了在存在NO _x的情况下，在烷烃氧化过程中，在发动机相关条件下首次在线检测HONO绝对浓度的气相色谱_。由于喷射搅拌反应器与连续波腔衰荡光谱仪的耦合，在实验室规模实现了检测。HONO形成的证据是通过将测得的cw-CRDS光谱与文献进行比较获得的。同时观察到HONO的形成和另一种氮化合物：NO _2的出现。这证实了在发动机条件下也可以由NO ₂形成HONO 。