More Insights into Support and Preparation Method Effects in Gold Catalyzed Glycerol Oxidation
Por:
Bogdanchikova, Nina, Tuzovskaya, Inga, Prati, Laura, Villa, Alberto, Pestryakov, Alexey, Farias, Mario
Publicada:
1 ene 2017
Resumen:
Background: Materials containing supported gold nanoparticles are
considered as the most favorable for liquid-phase alcohol oxidation. Our
previous studies showed that MgAl2O4 spinel can be an effective support
for gold catalysts in liquid-phase alcohol oxidation.
Objective: The aim of the present paper a comparative study of gold
supported on different metal oxides (Al2O3, MgO, MgAl2O4 spinel) in
liquid phase oxidation of glycerol. Also we highlighted the influence of
the precursor protective layer in mediating the support effect on
catalytic activity and comparing MgAl2O4 spinel with individual oxide
supports.
Method: Catalytic tests in glycerol liquid-phase oxidation at 50 degrees
C. Catalyst characterization by Transmission electron microscopy, X-ray
diffraction, adsorption measurements, plasma atomic emission
spectroscopy, X-ray photoelectron spectroscopy.
Results and Conclusion: It was shown that, depending on the preparation
method, the activity of Au supported on oxide supports can become
reversed. For deposition-precipitation method Au/Al2O3 is more active
than Au/MgO while for sol immobilization, the contrary occurs and Au/MgO
is more active than Au/Al2O3. Activities of Au catalysts supported on
MgAl2O4 spinel are high and close to each other for catalysts prepared
by both methods. It is suggested that Au particle size and interaction
of Au with support are activity determining parameters, while gold
content do not play a significant role. This study gets an insight on
the importance of the direct contact between the support and the gold
particle.
Filiaciones:
Bogdanchikova, Nina:
Univ Nacl Autonoma, Ctr Nanociencias & Nanotecnol, Ensenada 22800, Baja California, Mexico
Tuzovskaya, Inga:
Univ Nacl Autonoma, Ctr Nanociencias & Nanotecnol, Ensenada 22800, Baja California, Mexico
Prati, Laura:
Univ Milan, Milan, Italy
Villa, Alberto:
Univ Milan, Milan, Italy
Pestryakov, Alexey:
Tomsk Polytech Univ, Lenin Ave 30, Tomsk 634050, Russia
Farias, Mario:
Univ Nacl Autonoma, Ctr Nanociencias & Nanotecnol, Ensenada 22800, Baja California, Mexico
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