in the name of god. highly selective oxidation of benzyl alcohol to benzaldehyde catalyzed by zn-fe...
TRANSCRIPT
IN THE NAME OF GOD
Highly selective oxidation of benzyl alcohol to benzaldehyde catalyzed by Zn-Fe2O4@ZnO core-
shell nanostructures
Presenter:Prof. Rahmatollah Rahimi
Magor student:
Mahdi Heidari-Golafzani
Introduction
Experimental
Results and discussions
Conclusion
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Oxidation
Homogeneous catalysis
Heterogeneous catalysis
2
Introduction
BenefitsHigh activity and high selectivityHeat transfer and energy supply for reaction
DefectsPurification of catalyst is difficultRecovery of catalyst is difficult
Homogeneous catalysis
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BenefitsEasy separationReusability
Heterogeneous catalysis
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HeterogeneousMagnetisablityStabilityEasy synthesis
Important of Zn-Fe2O4@ZnO
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Schematic of reaction
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Precursor of pharmaceuticals Precursor of plastic additives Prepare of aniline dye malachite green Precursor of certain acridine dyes Prepare of cinnamaldehyde and styrene
Benzaldehyde
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Experimental
Cat. Alcohol Acetonitrile H2O2
80 ºC
Catalyst synthesis
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FeCl3.6H2O ZnCl2
Ethylene glycol
vigorous stirring
ammonium acetateFoam
Catalyst synthesis
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black precipitation
(Zn-Fe2O4)
215 ºC
48 h
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Zn-Fe2O4 application
adsorption Curve
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Zn-Fe2O4 analysis
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XRD VSM SEM
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01-073-1963
311
220 400
440
422
511
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1 120 nm
Catalyst synthesis
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Zn-Fe2O4 zinc acetate
(pH=11)
120 ºC
Zn-Fe2O4@ZnO
80 ºC
DI Water
3 h, 24 h
NH3
Results and discussions
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XRDSEM TEM
BET VSM
Zn-Fe2O4@ZnO analysis
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SEM
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1 150 nm
TEM
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XRD
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BET
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VSM
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76 emu/g
30 emu/g
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Zn-Fe2O4@ZnO
catalyst
photocatalyst
Photocatalytic activity
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Photocatalytic degradation curve
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Catalytic activity
GC analyze
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MASS analyze
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Optimization
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Evaluation
Comparision
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Table 3. Comparison with other catalysts
a Reaction condition:(1mmol) catalyst, 80C, 1.5h, under 1 atm of molecular oxygen. Conversion and selectivity were
determined by GC-MASS using an intemal standard.b Percent of conversion determined by GC-Ms.c Percent of selectivity determined by GC-Ms.d Benzhydrol (1 mmol), 70% TBHP (3 mmol), Cat. (10 mol%), temperature (70 ◦C).e Benzyl alcohol (20.0 mmol), Cat. (10 mol%),30 wt% H2O2 (33.0 mmol), temperature (70 ◦C). f Benzyl alcohol (10.0 mmol), Cat. (1mol%), 30 wt% H2O2 (10.0 mmol), temperature (75 ◦C).
Recyclability
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High selectivityShort reaction timeHeterogeneuslyInviormentaly firendlyGood to excellent yieldReusability
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Conclusion
[1]. Burange, A. S., Kale, S. R., Zboril, R., Gawande, M. B., & Jayaram, R. V. (2014). Magnetically retrievable MFe 2 O 4 spinel (M= Mn, Co, Cu, Ni, Zn) catalysts for oxidation of benzylic alcohols to carbonyls. RSC Advances, 4(13), 6597-6601.
[2]. Yan, K., Wu, X., An, X., & Xie, X. (2013). Facile synthesis and catalytic property of spinel ferrites by a template method. Journal of Alloys and Compounds, 552, 405-408.
[3]. Shi, F., Tse, M. K., Pohl, M.-M., Radnik, J., Brückner, A., Zhang, S., et al. (2008). Nano-iron oxide-catalyzed selective oxidations of alcohols and olefins with hydrogen peroxide. Journal of Molecular Catalysis A: Chemical, 292(1), 28-35.
[4]. Rahimi, R., Kerdari, H., Rabbani, M., & Shafiee, M. (2011). Synthesis, characterization and adsorbing properties of hollow Zn-Fe 2 O 4 nanospheres on removal of Congo red from aqueous solution. Desalination, 280(1), 412-418.
[5]. Rahimi, R., Heidari-Golafzani, M., & Rabbani, M. (2015). Preparation and photocatalytic application of Zn-Fe 2 O 4@ ZnO core-shell nanostructures. Superlattices and Microstructures.
References
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THE END
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