Topic
Platinum
About: Platinum is a research topic. Over the lifetime, 49675 publications have been published within this topic receiving 1150035 citations. The topic is also known as: Pt & element 78.
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TL;DR: In this paper, a closed system between 200 and 300 °C was used for redispersion of carbon monoxide layer over the platinum crystallites, and isotopic dilution experiments using 12CO13CO mixtures showed that the CO molecules are free of dipole-dipole coupling after the redispersive treatment.
185 citations
TL;DR: In this article, the formation of different oxidized Pt surface species previously indicated by TPR studies was confirmed by characteristic uv-vis spectra, which were used as the basis for a model describing the types of surface reactions and details of the platinum surface species formed in oxygen and in hydrogen.
185 citations
TL;DR: In this article, it is suggested that the effect of tin ions is related to their acid properties which enhance the reactivity of the CO bond, and that the reaction proceeds mainly through the hydrogenation of the c-O bond with formation of α,β-unsaturated alcohols.
185 citations
TL;DR: In this paper, the effect of temperature dependence on response magnitude and the influence of the metal activator layers for hydrogen gas sensitivity are presented and discussed, and the effects of different operating temperatures on the sensitivity of the devices were studied in the range of 30-300 ÂC.
Abstract: The hydrogen gas sensing performance of platinum (Pt) and gold (Au) catalyst activated WO 3 thin films were investigated. The WO 3 thin films were deposited onto alumina transducers with platinum inter-digital electrodes using a R.F. magnetron sputtering. Exposure to hydrogen gas, results in changes in the carrier concentration and hence, the conductivity of the film. The sensors were found to exhibit excellent sensitivities towards different hydrogen concentrations of 0.125, 0.25, 0.50 and 1% in air. The effects of different operating temperatures on the sensitivity of the devices were studied in the range of 30–300 °C. It was observed that the Pt–WO 3 and Au–WO 3 sensors were approximately 161 and 40 times more sensitive than the non-activated WO 3 sensor, respectively. In this paper, the effect of temperature dependence on response magnitude and the influence of the metal activator layers for hydrogen gas sensitivity are presented and discussed.
184 citations