Kinetics Database Logo

Kinetics Database Resources

Simple Reaction Search

Search Reaction Database

Search Bibliographic Database

Set Unit Preferences

Feedback

Rate Our Products and Services

Help


Other Databases

NIST Standard Reference Data Program

NIST Chemistry Web Book

NDRL-NIST Solution Kinetics Database

NIST Computational Chemistry Comparison and Benchmark Database

The NIST Reference on Constants, Units, and Uncertainty

More...


Administrative Links

NIST home page

MML home page

Chemical and Biochemical Reference Data Division

MML home page

Chemical and Biochemical Reference Data Division

  NIST Logo Home
©NIST, 2013
Accessibility information
Author(s):   Becker, K.H.; Kurtenbach, R.; Schmidt, F.; Wiesen, P.
Title:   Kinetics of the NCO Radical Reacting with Atoms and Selected Molecules
Journal:   Combust. Flame
Volume:   120
Page(s):   570 - 577
Year:   2000
Reference type:   Journal article
Squib:   2000BEC/KUR570-577

Reaction:   + NCOCO + NO
Reaction order:   2
Temperature:   302 - 757 K
Pressure:  3.33E-3 bar
Rate expression:   6.5x10-11 [±4.08x10-11 cm3/molecule s] (T/298 K)(-1.14±0.10)
Category:  Experiment
Data type:   Absolute value measured directly
Pressure dependence:   Rate constant is pressure dependent
Experimental procedure:   Flow tube - Data taken vs distance
Excitation technique:   Other
Time resolution:   In real time
Analytical technique:   Laser induced fluorescence
Comments:   248-nm photolysis of ClNCO/Ar mixtures used to generate NCO radicals.
O-atoms generated by microwave discharge in O2/Ar or CO2/Ar.
Concentration of O atoms established through NO2 chemiluminescence.
Unsymmetrical error limits reported. In the A-factor, (+3.2 and -2.2) x 10-8 and for n, (+0.08 and -0.12), in units of cm3s-1.
A pressure effect was indicated by a single point at 9.9 torr and 298K, with k = 10.24?.90 x 10-11 cm3s-1, about twice the rate constant at 2.5 torr.

View full bibliographic record.


Rate constant values calculated from the Arrhenius expression:

T (K)k(T) [cm3/molecule s]
302 6.40E-11
325 5.89E-11
350 5.41E-11
375 5.00E-11
400 4.65E-11
425 4.34E-11
450 4.06E-11
475 3.82E-11
500 3.60E-11
525 3.41E-11
550 3.23E-11
575 3.07E-11
600 2.93E-11
625 2.79E-11
650 2.67E-11
675 2.56E-11
700 2.46E-11
725 2.36E-11
750 2.27E-11
757 2.25E-11