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Co-TUD-1: a ketone-selective catalyst for cyclohexane oxidation.
Mohamed S Hamdy1, Anand Ramanathan, Thomas Maschmeyer
1Ceramic Membrane Centre, The Pore, DelftChemTech, Technische Universiteit Delft, Julianalaan 136, 2628 BL, Delft, The Netherlands.
Cobalt-containing mesoporous TUD-1 catalysts were synthesized. Lower cobalt loading, featuring isolated cobalt sites, demonstrated superior catalytic efficiency in cyclohexane oxidation compared to higher cobalt loadings.
Area of Science:
- Materials Science
- Catalysis
- Nanotechnology
Background:
- Mesoporous silica materials like TUD-1 offer high surface area and tunable porosity for catalytic applications.
- Cobalt-based catalysts are investigated for oxidation reactions due to their redox properties.
- Controlling the dispersion and speciation of active metal sites within a support is crucial for optimizing catalytic performance.
Purpose of the Study:
- To synthesize cobalt-containing mesoporous TUD-1 (Co-TUD-1) materials with varying silicon-to-cobalt ratios.
- To investigate the structural and textural properties of the synthesized Co-TUD-1 samples.
- To evaluate the catalytic performance of Co-TUD-1 in the liquid-phase oxidation of cyclohexane.
Main Methods:
- Synthesis of Co-TUD-1 via direct hydrothermal treatment (DHT) using triethanolamine (TEA) as a template.
- Characterization using X-ray Diffraction (XRD), UV/Vis spectroscopy, elemental analysis, N2 sorption, 29Si MAS-NMR, Raman spectroscopy, and HRTEM.
- Catalytic testing in solventless liquid-phase oxidation of cyclohexane using tert-butylhydroperoxide (TBHP).
Main Results:
- Successful synthesis of mesoporous TUD-1 materials incorporating cobalt.
- Characterization confirmed the presence of cobalt within the TUD-1 framework.
- Catalytic activity in cyclohexane oxidation was higher for samples with low cobalt loading, suggesting isolated Co(II) sites are more active than cobalt nanoparticles or bulk Co3O4.
Conclusions:
- The dispersion state of cobalt significantly impacts the catalytic performance of Co-TUD-1.
- Isolated Co(II) active sites within the mesoporous silica support exhibit enhanced catalytic efficiency for cyclohexane oxidation.
- Low cobalt loading is beneficial for maximizing catalytic activity in this system.
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