Studies of reactions of atoms in a discharge flow stirred reactor. Part 1.—The O + H2+ NO system

Campbell, Ian; Handy, Brian J.

doi:10.1039/f19757102097

Cited by 28 publications

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“…Although much of the work in the literature which uses this method has employed relatively expensive instrumentation (4)(5)(6)(7)(8)(9), it has also been used successfully with much less costly apparatus (12)(13)(14). We were surprised, then, when our initial efforts to apply the homogeneous reactor method gave results which were in very poor agreement with data reported in the literature.…”

Section: Introductioncontrasting

confidence: 46%

Section: Introductionmentioning

confidence: 99%

“…While considerable success has i been attained at the relatively low pressures of the VLPP method of Benson and co-workers (10, l l ) , the validity of the I homogeneity assumption at the higher pressures used in other work (3)(4)(5)(6)(7)(8)(9)(12)(13)(14)(15) is unclear and has not been examined 1 directly. The criteria for efficient mixing have received some attention (4,9,12), but the effect on the use of homogeneous reactors of the homogeneous atom sink represented by the excess reactant has been largely neglected in this higher pressure region. On the other hand, there are several theoretical and experimental evaluations of the relative importance of diffusive and convective mass transport in conventional flow systems operated at pressures of a few Torr (1 Torr = 133.3 Pa) and containing both homogeneous and localized heterogeneous atom sinks (16)(17)(18)(19)(20).…”

Section: Introductionmentioning

confidence: 99%

“…In the first method (4)(5)(6)(7)(12)(13)(14)(15), the inlet and exit atom concentrations are measured and are related to the rate constant for the reaction by where [Ale and [AIL are the inlet and exit atom concentrations respectively, v is the volumetric flow rate through the reactor and V is the reactor volume. The assumption is made that diffusional mixing is so fast that the exit atom concentration equals the bulk (homogeneous) atom concentration.…”

Section: Theorymentioning

confidence: 99%

“…The principles of kinetic measurements in a "well-stirred or 1 "homogeneous" reactor, first developed by Denbigh (1, 2), 1 have had sporadic application to the study of gas phase reactions 1 of atoms and radicals (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). While considerable success has i been attained at the relatively low pressures of the VLPP method of Benson and co-workers (10, l l ) , the validity of the I homogeneity assumption at the higher pressures used in other work (3)(4)(5)(6)(7)(8)(9)(12)(13)(14)(15) is unclear and has not been examined 1 directly.…”

Section: Introductionmentioning

confidence: 99%

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The kinetics of gas phase reactions studied in a "homogeneous reactor"

Roscoe¹

1988

Can. J. Chem.

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The use of a "well-stirred" or "homogeneous" reactor in kinetic studies of gas phase reactions has been examined to assess the sensitivity of the method to the criteria upon which its use is based. The effects of heterogeneous and homogeneous secondary reactions are considered and the validity of the assumption of homogeneity has been examined experimentally for conditions similar to those which have been used elsewhere. The atom sink presented by the excess reagent under pseudo first order conditions results in failure of the homogeneity assumption. However, it is found that homogeneity is not required for successful use of the method provided the analytical measurements have good spatial resolution and the reaction volume is well-defined. The method is illustrated by using it to study some reactions of 0 ( 3~) . JOHN M. ROSCOE. Can. J. Chem. 66, 2325 (1988.On a exarnint l'utilisation d'un rtacteur "bien agitC" ou "homogiine" dans les etudes cinttiques des rtactions en phase gazeuse, dans le but d'ttablir la sensibilitt de la mtthodeface i ses critiires d'utilisation. On a considtrt les effets des rtactions secondaires htttrogknes et homogtnes et on a examink exptrimentalement la validitt de l'hypothtse d'homogtntitt dans des conditions semblables i celles deji utilistes. Le puits d'atomes prtsentt par l'exciis de rtactifs dans des conditions de pseudo ordre 1 est di3 i l'insuffisance de l'hypothtse d'homogtntitt. On a trouvt que l'homogtntitt n'est pas ntcessaire pour une utilisation fmctueuse de la mtthode en admettant que les mesures analytiques ont une bonne rtsolution spatiale et que le volume rtactionnel est bien dtfini. On applique la mtthode i l'ttude de quelques rtactions du 0(3p).[Traduit par la revue]

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Section: Introductioncontrasting

confidence: 46%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The kinetics of gas phase reactions studied in a "homogeneous reactor"

Roscoe¹

1988

Can. J. Chem.

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The Structure of Freely Propagating and Burner‐Stabilized Flames in the H₂‐ CO ‐ O₂System

Warnatz

1979

Ber Bunsenges Phys Chem

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Flrrmrnen 1 Reuktionskinetik I Transporterscheinungen CO oxidation at flame conditions is of fundamental interest, since this process is the second stage of hydrocarbon combustion. To investigate this isolated reaction free and burner-stabilized CO -O2 and CO-air flames containing H2 or H 2 0 are considered. It is shown that CO oxidation In the presence of hydrogen is described by the H2 -02 mechanism and the additional reactionsOn the other hand, dry CO -O2 and CO-air mixtures are unreactive. For the reaction CO + OH + C 0 2 + H a rate constant is derived.Besides, details of the water gas equilibration are described.

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The H+NO recombination reaction over a wide temperature range

Riley

Cosic

Fontijn

2003

Int J of Chemical Kinetics

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Rate coefficients of the title reaction have been measured in a high-temperature photochemistry (HTP) reactor using Ar as the bath gas. H atoms were generated by flash photolysis of NH 3 and their relative concentrations were monitored by resonance fluorescence. The data are best fitted by k(295-905 K) = 6.5 × 10 −34 (T/K) 0.206 exp(780 K/T) cm 6 molecule −2 s −1 , with ±2σ precision values varying from 16 to 36% and corresponding suggested accuracy levels of 29-42%. Using a literature value for the relative collision efficiencies of N 2 and Ar indicates that for N 2 as the third body the above rate coefficient expression should be multiplied by 1.6. This leads to good agreement with two recent near 1000 K measurements.

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Studies of reactions of atoms in a discharge flow stirred reactor. Part 1.—The O + H2+ NO system

Cited by 28 publications

References 0 publications

The kinetics of gas phase reactions studied in a "homogeneous reactor"

The kinetics of gas phase reactions studied in a "homogeneous reactor"

The Structure of Freely Propagating and Burner‐Stabilized Flames in the H₂‐ CO ‐ O₂System

The H+NO recombination reaction over a wide temperature range

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Studies of reactions of atoms in a discharge flow stirred reactor. Part 1.—The O + H2+ NO system

Cited by 28 publications

References 0 publications

The kinetics of gas phase reactions studied in a "homogeneous reactor"

The kinetics of gas phase reactions studied in a "homogeneous reactor"

The Structure of Freely Propagating and Burner‐Stabilized Flames in the H2‐ CO ‐ O2System

The H+NO recombination reaction over a wide temperature range

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The Structure of Freely Propagating and Burner‐Stabilized Flames in the H₂‐ CO ‐ O₂System