Work

Pyrolysis Characteristics and Reaction Mechanism of Cement Fiberboard with Thermogravimetry/Fourier Transform Infrared Analysis

Year: 2025

Type: article

Abstract: In this study, thermogravimetric analysis (TGA) was coupled with Fourier-transform infrared (FTIR) spectroscopy to systematically investigate the pyrolysis characteristics and mechanisms of cement fiberboard across varying heating rates. Experimental findings demonstrated that the thermal degradation process occurs in four distinct phases. Overlapping decomposition peaks in DTG curves were successfully resolved using a double-Gaussian deconvolution algorithm. A comprehensive kinetic analysis was conducted by integrating model-free iso-conversional methods (Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose analysis) with a model-fitting technique (Coats–Redfern approximation) to determine the activation energies for each degradation stage. A subsequent FTIR spectroscopic analysis revealed that the evolution of gaseous products follows the sequence CO2 > H2O > CH4. The CO2 release was found to originate from multiple pathways, including the decomposition of organic components and high-temperature inorganic reactions. Notably, while the heating rate had a negligible impact on product speciation, it exhibited a statistically significant influence on CO2 emission intensities. Finally, mechanistic interpretations integrating Arrhenius parameters with time-resolved infrared spectral features were proposed for each thermal decomposition stage.

Source: Fire

DOI: 10.3390/fire8110426

Authors: Yuxiang Zhu, Longjiang Tang, Ying Hu, Chunlin Yang, Weijian Deng, Yanming Ding

Institutions: Guangdong Power Grid Company (China), China University of Geosciences

Language: English

Topic: Thermal and Kinetic Analysis

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $2,896