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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
Published on: August 17, 2019
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TiO2 and ZrO2 in biomass conversion: why catalyst reduction helps
Sergio Tosoni1, Hsin-Yi Tiffany Chen1,2, Antonio Ruiz Puigdollers1
1Dipartimento di Scienza dei Materiali, Università di Milano Bicocca, via Cozzi 55, Milan 20125, Italy.
Summary
Reducible oxide catalysts, like titania and zirconia, show enhanced activity in biomass conversion due to surface reduction creating active sites. This study explains why these reduced catalysts are superior for biofuel production.
Area of Science:
- Catalysis
- Materials Science
- Renewable Energy
Background:
- Lignocellulosic biomass conversion into biofuels relies on chemical methods using solid oxide catalysts.
- Reducible oxides are more active than non-reducible ones, but the underlying mechanisms require clarification.
- Understanding surface properties is crucial for optimizing biofuel production from biomass.
Purpose of the Study:
- To investigate the role of surface reduction in the catalytic activity of reducible (TiO2) and non-reducible (ZrO2) oxides for biomass conversion.
- To elucidate the mechanisms behind the enhanced performance of reduced oxide surfaces using theoretical calculations.
- To explore the impact of nanostructuring on oxide reduction and catalytic efficiency.
Main Methods:
- Density Functional Theory (DFT)+U calculations were employed to study the (101) surfaces of anatase TiO2 and tetragonal ZrO2.
- Simulations focused on surface reduction via oxygen vacancy creation or hydrogen treatment.
- Key biomass conversion reactions, ketonization of acetic acid and deoxygenation of phenol, were analyzed.
Main Results:
- Surface reduction, creating Ti3+ or Zr3+ ions and oxygen vacancies, significantly lowers reaction barriers and stabilizes intermediates.
- Ruthenium nanoparticles facilitate H2 dissociation and hydrogen spillover, leading to hydroxylated surfaces and promoting oxide reduction.
- Water desorption from hydroxylated surfaces may regenerate oxygen vacancies, particularly on nanoparticle surfaces.
Conclusions:
- Reduced oxide surfaces exhibit superior catalytic activity for biomass conversion reactions.
- Surface reduction mechanisms, including hydrogen spillover and vacancy regeneration, are critical for efficient biofuel production.
- Nanostructuring, as demonstrated with ZrO2 nanoparticles, can enhance oxide reduction and catalytic performance.
Keywords:
biomass conversiondensity functional theoryhydrogen spilloveroxide nanostructuresoxygen vacancytitaniazirconiaMore Related Videos
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