The reactions of NH(X{sup 3}{Sigma}{sup {minus}}) with the water gas components CO{sub 2}, H{sub 2}O, and H{sub 2}

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:93247

Roehrig, M; Wagner, H G ^[1]

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1. Georg-August-Univ. Goettingen (Germany). Inst. fuer Physikalische Chemie

In the combustion of nitrogen-containing systems and fuels, the radical NH can play an important role. Many reactions of this radical in its electronic ground state are supposed to be very slow at room temperature. Therefore, experiments have been performed behind shock waves to study some reactions of NH(X{sup 3}{Sigma}{sup {minus}}) that are of interest in combustion processes. As a source of NH(X{sup 3}{Sigma}{sup {minus}}), HN{sub 3} was used, which dissociates sufficiently fast above 1,000 K. In order to achieve high sensitivity, NH(X{sup 3}{Sigma}{sup {minus}}) concentration was measured with a ring dye laser. The reactions of NH(X{sup 3}{Sigma}{sup {minus}}) with the water gas components H{sub 2} (2), H{sub 2}O (3), and CO{sub 2} (4) were investigated in the temperature range of 1,100--2,000 K. The reactions of NH(X{sup 3}{Sigma}{sup {minus}}) with H{sub 2}O and CO{sub 2} proved to be rather fast. The rate constants obtained were as follows: k{sub 2} = 10{sup 14.0 {+-} 0.2} exp[{minus}(10,100 {+-} 200) K/T] cm{sup 3}/mol s; k{sub 3} = 10{sup 13.3 {+-} 0.2} exp[{minus}(6970 {+-} 200) K/T] cm{sup 3}/mol s; k{sub 4} = 10{sup 13.0 {+-} 0.2} exp[{minus}(7220 {+-} 200) K/T] cm{sup 3}/mol s. Rate constants for the reverse reactions are also given. While the reaction of NH(X{sup 3}{Sigma}{sup {minus}}) with H{sub 2} proceeds in the expected way, the reactions of CO{sub 2} and H{sub 2}O rapidly form species with N{single_bond}O bonds like HNO.

• OSTI ID: 93247
• Report Number(s): CONF-940711--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ACTIVATION ENERGY
AIR POLLUTION CONTROL
AMINATION
COMBUSTION KINETICS
EXCITATION
EXPERIMENTAL DATA
HYDROCARBONS
KINETIC EQUATIONS
NITROGEN OXIDES
RADICALS
WATER GAS