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Noble metal
About: Noble metal is a research topic. Over the lifetime, 15113 publications have been published within this topic receiving 337947 citations.
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TL;DR: Palladium-based catalysts have been found to be the most efficient catalysts for the catalytic oxidation of methane to carbon dioxide and water as discussed by the authors, and the reaction rate is dependent on methane concentration, generally to the first order or less.
361 citations
TL;DR: In this paper, the ionization and redeposition of binary alloys, coupling of the anodic reactions in accordance with the concepts of irreversible thermodynamics, and volume diffusion in the presence of given supersaturations of single and double vacancies are analyzed theoretically.
Abstract: In the electrolytic dissolution of binary alloys the concepts of ionization and redeposition of a metal, coupling of the anodic reactions in accordance with the concepts of irreversible thermodynamics, and volume diffusion in the presence of given supersaturations of single and double vacancies are analyzed theoretically. The ionization‐redeposition mechanism is in principle possible but only if coupling of the anodic reactions occurs. Volume diffusion may be operative via divacancies. Results from x‐ray investigations and from measurements with a rotating disk‐ring electrode for copper‐gold alloy indicate that interdiffusion of the constituent metals in the alloy occurs to a significant extent and dissolution of Au does not take place. Electrochemical measurements with a Cu‐Zn alloy involving 30 a/o (atomic per cent) Zn give no indication of occurrence of the ionization‐redeposition mechanism.
361 citations
TL;DR: In this paper, high surface area molybdenum and tungsten carbide materials, synthesised by the temperature programming reduction of the relevant metal oxide with methane/hydrogen, are highly efficient catalysts for the conversion of methane to synthesis gas, via the steam reforming, dry reforming, or partial oxidation processes.
360 citations
TL;DR: The preparation, characterization, and catalytic activity of supported metal phosphides are reviewed in this article, where the authors show that the surfaces of Ni2P reconstruct to P-rich surfaces.
Abstract: The preparation, characterization, and catalytic activity of supported metal phosphides are reviewed. Reduction of metal compounds together with phosphate is a convenient method to prepare metal phosphides, but requires high temperature. Reduction with phosphite, hypophosphite, or phosphine and the plasma reduction of phosphate can be carried out at lower temperatures, which leads to smaller metal phosphide particles and more active catalysts. Organometallic routes allow the separate synthesis of metal phosphide nanoparticles, which have to be added to the support in a second step. LEED, STM, XPS, and DFT studies have shown that the surfaces of Ni2P reconstruct to P-rich surfaces. The investigation of metal phosphides as catalysts for hydrotreating reactions continues to be a topic of considerable research with recent advances realized in using bimetallic and noble metal phosphides to achieve high activities and tailored selectivities. Finally, hydrodeoxygenation catalysis over metal phosphides is a growing area of research given the need to develop catalysts for upgrading biomass to transportation fuels.
359 citations
TL;DR: In this article, the noble-metal-free CoP/g-C 3 N 4 hybrid was used as a photocatalyst for the highly efficient hydrogen generation by water splitting under visible light irradiation.
Abstract: Photocatalytic hydrogen generation from water is an important solar-to-chemical conversion process, and is also a sustainable and environment-friendly generation approach for energy source of hydrogen. Herein, for the first time, we report the noble-metal-free CoP/g-C 3 N 4 hybrid as a photocatalyst for the highly efficient hydrogen generation by water splitting under visible light irradiation, whose hydrogen generation rate is ∼131 times higher than that of pure g-C 3 N 4 , and is even better than that of Pt/g-C 3 N 4 . Based on the detailed analyses of photoluminescence (PL) spectra, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), photocurrent-time ( i-t ) curves, and electrochemical impedance spectroscopy (EIS) Nyquist plots, the reason for the high efficiency of CoP/g-C 3 N 4 is found to be its good absorption ability of visible light, highly effective separation and low recombination rate of photo-generated electron-hole pairs due to the addition of CoP to g-C 3 N 4 .
359 citations