Publication

Current-assisted activation of Rh/TiO2/YSZ catalyst

Christos Comninellis, György Foti
2004
Journal Articles

Abstract

Rhodium thin film catalyst supported on YSZ solid electrolyte and interfaced with a dispersed TiO2 layer (Rh/TiO2/YSZ) exhibits the particular behavior of having two distinct stable states, an inactive (oxidized) and an active (metallic) state, with respect to the partial oxidn. of methane to syngas. Close to stoichiometric gas compn. (CH4:O2=2:1) at 550 DegC, the inactive Rh/TiO2/YSZ catalyst was successfully activated by current application, either pos. or neg. The obsd. phenomenon is an example of "permanent electrochem. promotion" providing a permanent rate enhancement ratio of 11 and a CO selectivity of 45%. Activation by neg. current is explained with electrochem. redn. of surface rhodium oxide, while under pos. current application the surface rhodium oxide breaks due to weakening of the Rh-O binding strength by accumulation of backspillover oxygen at the gas exposed catalyst surface. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/f280a93e-68c3-4730-82b8-34d0d03aa15d

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Christos Comninellis, György Foti
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f280a93e-68c3-4730-82b8-34d0d03aa15d

About this result

Related concepts (31)

Rhodium

Rhodium is a chemical element with the symbol Rh and atomic number 45. It is a very rare, silvery-white, hard, corrosion-resistant transition metal. It is a noble metal and a member of the platinum group. It has only one naturally occurring isotope: 103Rh. Naturally occurring rhodium is usually found as a free metal or as an alloy with similar metals and rarely as a chemical compound in minerals such as bowieite and rhodplumsite. It is one of the rarest and most valuable precious metals.

Catalysis

Catalysis (kəˈtæləsɪs) is the process of change in rate of a chemical reaction by adding a substance known as a catalyst (ˈkætəlɪst). Catalysts are not consumed by the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recycles quickly, very small amounts of catalyst often suffice; mixing, surface area, and temperature are important factors in reaction rate. Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process of regenerating the catalyst.

Platinum

Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". Platinum is a member of the platinum group of elements and group 10 of the periodic table of elements. It has six naturally occurring isotopes. It is one of the rarer elements in Earth's crust, with an average abundance of approximately 5 μg/kg.

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Current-assisted activation of Rh/TiO2/YSZ catalyst

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