Remarkable nanosize effect of Zirconia in Au/ZrO2 catalyst for CO oxidation

Article Abstract:

Nanosize effect of ZrO2 in Au/ZrO2 catalyst was studied by deposition-precipitation of Au nanoparticles in similar sizes (4-5 nm) on ZrO2 nanoparticles of varying sizes. The findings indicate that nanocomposite Au/ZrO2 consisting of comparably sized Au-metal (4-5 nm) and ZrO2 (5-15nm) nanoparticles are found advantageous over those containing similar sized Au-metal but larger ZrO2 (40-200nm) particles for CO oxidations.

Oxidation-reduction reaction, Oxidation-reduction reactions, Nanoparticles

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Thermodynamic tetragonal phase stability in Sol-Gel derived nanodomains of pure zirconia

Article Abstract:

Nanocrystalline (15-30 nm) and submicron-sized (500-600 nm) zirconia (ZrO2) particles are synthesized using the sol-gel technique and the metastable tetragonal phase is stabilized at room temperature within pure ZrO2 nanodomains of size 15-45 nm having nonspherical morphology. Using thermodynamic analysis, it is revealed that the critical nanosize for tetragonal phase stabilization, at room temperature, may vary.

Science & research, Research, Crystalline polymers

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Surface structure of hydroxylated and sulfated zirconia. A periodic density-functional study

Article Abstract:

An examination of the surface structure of sulfated zirconia (SZ) is presented by density-functional theory (DFT) with periodic boundary conditions. The study observed a qualitative change of the prevailing sulfate surface species depending on the sulfatation agent (SO3 or H2O4).

Hydroxylation, Structure, Sulfidation

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