Critical Review of the Heats of Formation of HNO and Some Related Species

Abstract

A critical review of the heat of formation of HNO is presented. This molecule and, therefore, its thermodynamics parameters play crucial roles in the chemical mechanism of propellant combustion and NOx pollutant chemistry. It was found that predissociation experiments, which have gone largely unnoticed for over 15 yr, lead to a significant revision in the recommended value. The new value, 25.6 + 0.6 kcal/mol and 25.6 - 0.1 kcal/mol (298 K; 26.3 kcal/mol at 0 K), is 1 to 2 kcal/mol higher than previous recommendations and has much narrower error limits. Heats of formation of NO, NH2OH, (HNO)(+), and (HNO)(-) are also briefly examined, and recommendations are made. Finally, recommendations for future experiments and a brief survey of methods of production of HNO are given in the hope that these will facilitate future studies.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1997
Accession Number
ADA332920

Entities

People

  • William R. Anderson

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Reaction Properties
  • Chemical Reactions
  • Chemistry
  • Combustion
  • Computer Programs
  • Dissociation
  • Energy
  • Energy Transfer
  • Exothermic Reactions
  • Heat Energy
  • Ionization
  • Measurement
  • Military Research
  • Physical Chemistry
  • Physics
  • Spin-Orbit Interaction
  • Thermodynamics

Readers

  • Combustion science or combustion engineering.
  • Molecular Photonics/Laser Physics
  • Theoretical Analysis.