Topic
Tungsten
About: Tungsten is a research topic. Over the lifetime, 35225 publications have been published within this topic receiving 456213 citations. The topic is also known as: W & element 74.
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172 citations
TL;DR: In this article, the effects of tungsten on vanadium-based catalysts were studied under different dispersed conditions of Tungsten oxide on titania surface, and it was indicated that two-dimensional vanadium species exhibits a tendency to moderately anchor onto titania surfaces in the immediate vicinity of tengsten species.
172 citations
TL;DR: In this article, it was shown that WO 3 γ-Al 2 O 3 cannot be appreciably reduced in hydrogen at 550 °C, whereas WO3 SiO 2 is reduced to lower valence states and unsupported wO 3 is completely reduced to tungsten metal under these conditions.
171 citations
TL;DR: In this paper, it was shown that the experimental data can be interpreted on the basis of a non-uniform surface without interaction, the heterogeneity of the surface being specified in terms of an exponential distribution of sites given by the distribution function N =ce−χ/χm, where χ represents the energy difference between the lowest energy state of the gas and the highest energy of the adsorption complex.
Abstract: An analysis of the extensive experimental data of Frankenburg on the adsorption of hydrogen by metallic tungsten powder between −194 and 750°C has been made, using the Fowler‐Guggenheim treatment of adsorption phenomena as the mode of approach. It has not been found possible to interpret the data in terms of interaction between the adsorbed species on a uniform adsorbent surface. It is shown that the experimental data can be interpreted on the basis of a non‐uniform surface without interaction, the heterogeneity of the surface being specified in terms of an exponential distribution of sites given by the distribution function N=ce−χ/χm, where χ represents the energy difference between the lowest energy state of the gas and the lowest energy of the adsorption complex. Such a distribution function yields the experimentally observed relation d lnp/d lnθ=constant at constant temperature. Such a heterogeneity is especially significant in the case of tungsten metal which hitherto has been treated as an essential...
171 citations
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TL;DR: In this article, single crystals of aluminum nitride up to 1 cm long and 0.3 in diameter have been grown by a sublimation-recondensation technique at about 2250°C.
171 citations