Fundamentals of nitric oxide formation in fossil fuel combustion. Progress report, 29 December 1979-28 March 1980

Technical Report · Sun Jun 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/5414331· OSTI ID:5414331

Houser, T.; McCarville, M. E.

It was necessary to again revise the papers on the kinetics of pyridine pyrolysis after which they were accepted by the International Journal of Chemical Kinetics. The revised consideration of the rate of formation of HCN required an algebraic derivation to produce a new rate equation. If it is assumed that a fraction (..cap alpha..) of the decomposed pyridine forms an intermediate, a fraction of which (..beta..) is capable of reacting further to form HCN, and that that formation is first-order in intermediate, the following rate equation describes the data: rho/t = k/sub b/..cap alpha beta..-k/sub b/rho. Where rho is moles HCN formed/mole pyridine decomposed, t is contact time and k/sub b/ is the first-order rate constant for the formation step. In addition. it was shown that since rho was independent of initial pyridine concentration, the formation step was necessarily first-order. The Arrhenius parameters for k/sub b/ were 39.5 kcal/mole and 6.8 for E/sub a/ and log A (sec/sup -1/) respectively. At 950 and 1000/sup 0/C it was found that ..cap alpha beta.. product was one, indicating all the pyridine could form HCN given enough time to react, whereas at 900/sup 0/C the maximum HCN formed would be only about 60% of the pyridine decomposed. Finally, it was determined that the fraction of decomposed pyridine which can form HCN at a given time ranged from 0.16 to 0.77, indicating a significant concentration of intermediate builds up at all conditions. No volatile product found in the pyrolysis is close to that range of yields, thus the precursor to the HCN must react further on leaving the reactor.

• Research Organization: Western Michigan Univ., Kalamazoo (USA). Dept. of Chemistry
• DOE Contract Number: AC01-76ET10593
• OSTI ID: 5414331
• Report Number(s): FE-2018-16
• Country of Publication: United States
• Language: English

Related Subjects

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010900 -- Coal
Lignite
& Peat-- Environmental Aspects
014000 -- Coal
Lignite
& Peat-- Combustion
02 PETROLEUM
025000 -- Petroleum-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ARRHENIUS EQUATION
AZINES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DATA
DATA FORMS
DECOMPOSITION
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GRAPHS
HETEROCYCLIC COMPOUNDS
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PYRIDINE
PYRIDINES
PYROLYSIS
REACTION KINETICS
STRUCTURAL MODELS
TABLES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
YIELDS