Study on the Kinetics of Plant Oil Asphalt Pyrolysis Using Thermogravimetry and the Distributed Activation Energy Model
2014
Tang, Qiang | Zheng, Yanyan | Wang, Tiefeng | Wang, Jinfu
Plant oil asphalt (POA) is a new concerned lipid-based residue biomass generated from the oleochemical industry. In this work, the pyrolysis kinetics of POA was studied by thermogravimetric analysis at heating rates of 7, 10, 20, and 30 K min–¹ under a nitrogen atmosphere using the distributed activation energy model (DAEM). The kinetic parameters, including the activation energy E, distribution function of activation energy f(E), and pre-exponential factor k₀, were obtained. The activation energy E ranged from 75 to 300 kJ mol–¹, and the f(E) curve showed a broad peak around 155–200 kJ mol–¹. The linear relationship between ln k₀ and activation energy E indicated that there existed a kinetic compensation effect in pyrolysis of POA. A double-Gaussian DAEM was employed for simulation of POA pyrolysis by assuming POA as a mixture of two pseudo-components. In comparison to the single-Gaussian DAEM, the double-Gaussian DAEM was better to predict the pyrolysis behavior of POA. This work validated the applicability of the double-Gaussian DAEM to the lipid-based material POA.
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