Effect of Ca(super 2+) position in zeolite Y on selective oxidation of propane at room temperature

Article Abstract:

The activity of CaNaY zeolites in selective oxidation of propane with increasing Ca(super 2+) content at room temperature was studied with infrared spectroscopy and ammonia temperature-programmed desorption. Increasing the Ca(super 2+) exchange level in CaNaY zeolites resulted in a variety of altered properties: the amount of Bronsted and Lewis acid sites increased, the adsorption of propane increased, the initial acetone formation rate increased, and the desorption of acetone retarded.

Calcium, Oxidation-reduction reaction, Oxidation-reduction reactions, Calcium (Chemical element)

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Role of surface defects in activation of O2 and N2O on ZrO2 and yttrium-stabilized ZrO2

Article Abstract:

The relationship between the structure of yttrium-stabilized zirconia (YSZ) and ZrO2 catalysts and their ability to activate N2O and O2 is studied by determination of catalytic properties. N2O can be activated at structural defects and intrinsic oxygen vacancies [Zr'(sub Zr-)V(super ..)(sub O-)Zr'(sub Zr)] and forms two types of oxygen species (alpha-O and beta-O) on the surface, respectively.

Yttrium & Compounds, Surface chemistry, Zirconium oxide, Yttrium compounds

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Formation of M(super 2+)(O2)(C3H8) species in alkaline-earth-exchanged Y zeolite during propane selective oxidation

Article Abstract:

The adsorption of oxygen and d2-propane (CH3CD2CH3) is studied on a series of alkaline-earth-exchanged Y-zeolite at room temperature. The study demonstrates that O2 and propane can simultaneously attach to one active center [M(sub 2+)] to form a M(super 2+)(O2)(C3H8) species, which is proposed to be the precursor in thermal propane selective oxidation.

Electric properties

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