Hydrogenation of pinene on spent fluid cracking catalyst supported nickel: Langmuir–Hinshelwood kinetic modelling
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Abstract
The kinetics for the pinene hydrogenation to pinane, the transformation of renewable biomass to useful chemicals, using spent fluid catalytic cracking catalyst (SFCC) supported nickel (Ni/SFCC), has been extensively investigated without any organic solvent, in the temperature range 373–393 K and the hydrogen pressure of 2–6 MPa in the absence of diffusional limitation. The non-noble metal catalyst was synthesized by incipient wet impregnation method and characterized by SEM, XPS and ICP. The catalytic effects of various parameters (catalyst weight, temperature and hydrogen pressure) on the reaction were reported, and the novel catalyst exhibited good activity. 17 kinds of Langmuir–Hinshelwood surface reaction mechanisms for the hydrogenation of pinene were proposed and derived. The best model described the experimental data with physically meaningful parameters was obtained by parameter diagnostics and a non-linear regression analysis, in which the surface reaction of adsorbed hydrogen atoms and pinene molecules over nickel catalyst was the rate-controlling step during the entire hydrogenation process. The activation energy of pinene surface hydrogenation to pinane was 118 ± 2.61 kJ mol−1 calculated from the Arrhenius plot.
Keywords
Spent FCC Pinene Supported Ni catalysts Langmuir–Hinshelwood model KineticsAbbreviations
- a
Constant
- A
Pinene
- b
Constant
- bi
Apparent adsorption equilibrium constant of component i, L mol−1
- c
Constant
- CA0
Initial concentration of pinene, mol L−1
- Ci
Concentration of component i, mol L−1
- C1, C2
Intrinsic parameters
- D
Pinane
- F
F-test function
- Ft
Tabled values of F-test
- H
Hydrogen
- k
Reaction rate constant, min−1
- K
Equilibrium constant of surface reaction
- PH
The pressure of hydrogen, MPa
- r
Rate of reaction, mol min−1 L−1
- X
The conversion of pinene
Greek letters
- αH
The apparent solubility coefficient of hydrogen in pinene, mol L−1 MPa−1
- θi
Fraction of vacant active sites of various type of component i
- θv
Fraction of vacant active sites of nickel catalyst
- ρ2
Correlation coefficient of model
- *
Active nickel site
Subscripts
- i
Component in the mixture
Notes
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 31060102), the Guangxi Natural Science Foundation (Grant Nos. 2014GXNSFDA118010 and 2013GXNSFAA0190507), and the Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology.
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