کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6467094 | 1423248 | 2017 | 12 صفحه PDF | دانلود رایگان |
- Guidelines for calculating combustion kinetics of coke combustion.
- Data obtained in a thermobalance using a spent FCC catalyst.
- Kinetic model-based, isoconversional and modulated methods.
- Best practices for each method and its pros-cons.
This work compares different methodologies for calculating the kinetic parameters of coke combustion, employed for catalyst regeneration, using thermogravimetric methods. A reference fluid catalytic cracking (FCC) spent catalyst was used as a representative example of the deactivated catalyst for the combustion runs, pre-used in the cracking of a vacuum gas oil at 773Â K and 3Â s. Three different types of approaches have been performed in order to obtain kinetic combustion parameters: (i) kinetic model-based, (ii) isoconversional and (iii) modulated methods. Additionally, a series of empirical modifications have been proposed to predict the kinetic behavior at different heating rates for the model-based approach. Using the best conditions and methods, the combustion activation energy of coke, deposited after the reaction mentioned, is in the order of â¼114, â¼156, and â¼162Â kJÂ molâ1 for the kinetic model-based, isoconversional and modulated methods, respectively. The recommendations for measuring kinetic parameters are reported together with the benefits/disadvantages using the three mentioned approaches.
Journal: Chemical Engineering Science - Volume 171, 2 November 2017, Pages 459-470