Quantitative studies by differential scanning calorimetry of the reaction between hydrogen peroxide and lignocellulose

• Published in: Journal of applied polymer science 1983-02, Vol.28 (2), p.647-658
• Main Authors: Nguyen, T, Zavarin, E, Barrall, E.M. II
• Format: Article
• Language: English
• Subjects: forest products; forestry; nontimber forest products; phytochemicals
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.1983.070280220

Heat of reaction and kinetic parameters were determined by differential scanning calorimetry for decomposition of hydrogen peroxide, reaction of hydrogen peroxide with lignocellulosic materials, glucose and pinitol, and for the reaction of the same materials with produced or introduced oxygen. The heat of decomposition of hydrogen peroxide obtained in N2 (720 cal/g H2O2) was in fair agreement with literature data, considering the different temperature and pressure conditions. The heats of reaction of hydrogen peroxide and lignocelluloses were higher when determined in N2 (1670–2500 cal/g H2O2) than in O2 (1450–2020 cal/g H2O2) atmosphere. The activation energy for decomposition of hydrogen peroxide amounted to 20.3 kcal/mol in N2 and 15.9 kcal/mol in O2 with frequency factors of 5.7 × 109 and 3.7 × 107 min−1, respectively. The activation energies for the reaction of hydrogen peroxide and lignocellulosic materials tested were similar and not influenced by the atmospheric composition, ranging overall between 19.7 and 22.4 kcal/mol. The corresponding frequency factors ranged between 2.77 × 109 and 2.23 × 1011.