nitrogen oxide | 12401-82-0

• 英文名称: nitrogen oxide
• CAS: 12401-82-0
• 化学式: NO
• 分子量: 28.9994
• InChiKey: MWUXSHHQAYIFBG-BJUDXGSMSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  None
• 重原子数：
  None
• 可旋转键数：
  None
• 环数：
  None
• sp3杂化的碳原子比例：
  None
• 拓扑面积：
  None
• 氢给体数：
  None
• 氢受体数：
  None

反应信息

• 作为反应物：
  描述：

  nitrogen oxide 在 CrO₃ 作用下， 以 neat (no solvent) 为溶剂， 生成
  参考文献：
  名称：

  Heterogeneous Chemical Processing of ¹³NO₂ by Monodisperse Carbon Aerosols at Very Low Concentrations

  摘要：

  The heterogeneous reaction of NO2 with different carbon aerosol particles was investigated in situ. The NO2 was labeled with the beta(+)-emitter N-13 (half-life 10.0 min) which allowed application of NO2, at very low concentrations. The carbon aerosol was either produced by a spark discharge generator using graphite electrodes or by a brush generator resuspending commercial soot material. Monodisperse size cuts between 50- and 490-nm diameter were selected and mixed with the (NO2)-N-13. After a defined reaction time, the different reaction products were separated by means of selective traps and detected on-line by gamma-spectrometry. A sticking coefficient for chemisorption of NO2 between 0.3 x 10(-4) and 4.0 x 10(-4) and a rate constant for the reduction of adsorbed NO2 to NO(g) between 4.0 x 10(-4) and 9.4 x 10(-4) s(-1) were determined for both aerosols. The sticking coefficient obtained in this study in situ with aerosol particles is 2 orders of magnitudes smaller than the uptake coefficient recently reported with bulk carbon material.

  DOI：

  10.1021/jp9606974
• 作为产物：
  描述：

  氨，N-13 在 铂 作用下， 以 neat (no solvent, gas phase) 为溶剂， 生成 nitrogen oxide 、 、
  参考文献：
  名称：

  用正电子发射谱研究铂海绵上的氧对氨解离的活化作用

  摘要：

  正电子发射谱（PEP）用于研究氨在金属和预氧化铂海绵上在323–573 K温度范围内的吸附和离解。结果表明，氨与铂的相互作用较弱，而不会解离。相反，预氧化的铂能够离解氨。随着温度的增加更多的氨被转化成N 2，N 2 O，和H 2 O.吸附NO似乎是一种重要的中间体，而它的形成强烈地依赖于氧的表面覆盖。进行程序升温实验以表征吸附的氮物质。此外，H 2，NH 3，NO和NO用于与这些吸附的氮物质发生反应。这些实验表明在铂表面上主要存在NH x物质。

  DOI：

  10.1016/s0021-9517(03)00191-x

文献信息

• Use of positron-emitting nitrogen-13 for studies of the selective reduction of nitric oxide by ammonia over vanadia/titania catalyst at very low reactant concentrations
  作者：Urs Baltensperger、Markus Ammann、Ulrich K. Bochert、Bernd Eichler、Heinz W. Gaeggeler、Dieter T. Jost、Joseph A. Kovacs、Andreas Tuerler、Ulrich W. Scherer、Alfons Baiker

  DOI：10.1021/j100149a037

  日期：1993.11

  Positron-emitting (NO)-N-13 molecules produced with a cyclotron were used to investigate the selective catalytic reduction (SCR) of NO by NH3 over vanadia/titania at very low reactant concentrations. The (NO)-N-13 concentration was on the order of 5 x 10(-9) ppm, which is more than 11 orders of magnitude lower than the usually used concentrations. Catalyst samples were pretreated with H-2 or NH3, without adding these reagents during the conversion experiments. Under these conditions the vanadia/titania catalyst pretreated with NH3 kept its full activity for at least 5 h. At the low NO concentrations present, 50% conversion was already achieved at 80-degrees-C, with complete conversion at 150-degrees-C. The reaction rate at 92-degrees-C was 1.9 x 10(-18) mol of NO (g of catalyst)-1 s-1. This value is in good agreement with the value expected from measurements with a similarly prepared catalyst assuming a first-order reaction in NO. The activation energy was calculated to be 37 kJ mol-1, which compares fairly well with the one measured on a similarly prepared catalyst under usual reactant concentrations (43 kJ mol-1). In contrast, vanadia/titania pretreated with H2 did not show any NO conversion. These results indicate that NH3 is necessary for NO conversion and that one N atom of the formed N2 originates from NH3. Using a thermochromatographic apparatus, adsorption enthalpies (at zero coverage) for NO and NO2 on various oxides were determined. Values of -21 +/- 2 and -33 +/- 3 kJ mol-1 were found for NO and NO2, respectively, independent of the material.