Abstract
Kinetic modeling of the hydrogenolysis of glycerol was performed; a chromium-free Ni–Cu–SiO2 nanocomposite catalyst was used to produce 1,2-propanediol (1,2-PDO) at a low hydrogen-to-glycerol ratio. Kinetic data were produced in a fixed-bed reactor under a variety of temperatures, hydrogen-to-glycerol ratios, and space velocities. The reaction rates were developed based on the two-step reaction mechanism (the production of 1,2-PDO via acetol) and the reaction pathways for the byproducts observed in the experimental study. The kinetic parameters were estimated by fitting kinetic data, and the validity of the developed model was corroborated. Further analysis using the model showed that the reaction at a high temperature and a low space velocity could accomplish 95% conversion of glycerol; However, the low temperature was preferred to minimize the production of unwanted species (intermediate and byproducts) at the slight expense of conversion.
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The datasets in the main manuscript will be presented upon request.
Abbreviations
- A t :
-
Cross-sectional area of the catalytic tube, cm2
- c i :
-
Concentration of species i, mmol/cm3
- C P :
-
Heat capacity, J/(g·K)
- C WP :
-
Dimensionless Weisz-Prater parameter
- D t :
-
Tube diameter, cm
- E :
-
Activation energy, J/mol
- F obj :
-
Objective function
- Δ H :
-
Heat of adsorption, J/mol
- Δ H r :
-
Heat of reaction, J/mol
- k :
-
Forward reaction rate constant
- K :
-
Adsorption equilibrium constant, bar–1
- \(\dot{m}\) :
-
Mass flow rate, g/s
- NE :
-
Number of experimental conditions
- NR :
-
Number of reactions
- P :
-
Partial pressure, bar
- R i :
-
Reaction rate, mmol/(gcat·h)
- T :
-
Temperature, K
- U :
-
Overall heat transfer coefficient, W/(m2·K)
- w i :
-
Weighting factor
- calc:
-
Calculated values
- exp:
-
Experimental data
- ref:
-
Reference
- W :
-
Wall
- \(\rho_{B}\) :
-
Bulk density, g/cm3
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Acknowledgements
This work was supported by the Low-Carbon Chemical Technology Innovation Program for Alternative Fuel from Petroleum (Grant No. RS-2022-00156196) funded by the Ministry of Trade, Industry, and Energy (MOTIE), Republic of Korea.
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Woo, Y., Lee, M., Cha, S.H. et al. Kinetic modeling of hydrogenolysis of glycerol to 1,2-propanediol using a chromium-free Ni–Cu–SiO2 nanocomposite catalyst. Reac Kinet Mech Cat 136, 867–879 (2023). https://doi.org/10.1007/s11144-023-02390-3
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DOI: https://doi.org/10.1007/s11144-023-02390-3