Topic
Nickel
About: Nickel is a research topic. Over the lifetime, 79308 publications have been published within this topic receiving 1210058 citations. The topic is also known as: Ni & element 28.
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TL;DR: In this article, a series of MnOx-NiO composite oxide catalysts were prepared by co-precipitation method and used in the catalytic combustion of lean methane at low temperature.
Abstract: A series of MnOx-NiO composite oxide catalysts were prepared by co-precipitation method and used in the catalytic combustion of lean methane at low temperature. Compared with the corresponding single NiO and MnOx oxides, the MnOx-NiO composite oxide with proper composition exhibits much higher catalytic performance in the lean methane oxidation. XRD and HRTEM results demonstrate that MnOx-NiO is in the form of a Ni-Mn-O solid solution. XAFS and XPS results indicate that the content of manganese in MnOx-NiO has a significant influence on the oxidation state of manganese and the crystal defect of nickel oxide. MnOx-NiO catalyst with an atomic Mn/(Mn + Ni) ratio of 0.13 is provided with abundant highly dispersed manganese species of higher valence (Mn4+) and higher coordination number as well as certain nickel vacancies, due to the strong interaction between Ni and Mn species. H-2-TPR and O-2-TPD results show that the MnOx-NiO composite oxide exhibits better reducibility and oxygen mobility than NiO. All these characterizations suggest a prominent synergism between NiO and MnOx in the MnOx-NiO composite oxide, which contributes to its high performance in the lean methane combustion. (C) 2012 Elsevier B.V. All rights reserved.
166 citations
TL;DR: In this article, the bulk and surface characteristics during decomposition of the transition metal sulfates of copper, iron (II), iron (III), nickel, and zinc are investigated utilizing various spectroscopic techniques.
166 citations
166 citations
TL;DR: In this article, the reactions of alkenyl sulphides, benzenethiols, and aryl sulphides with methylmagnesium, mediated by bis(triphenylphosphine)nickel dichloride, in benzene solution have been shown to lead to olefins (predominantly with retention of configuration), toluenes, and biphenyls in medium to high yields.
Abstract: The reactions of alkenyl sulphides, benzenethiols, and aryl sulphides with methylmagnesium and arylmagnesium bromides, mediated by bis(triphenylphosphine)nickel dichloride, in benzene solution have been shown to lead to olefins (predominantly with retention of configuration), toluenes, and biphenyls in medium to high yields.
166 citations
TL;DR: In this paper, nonlinear least squares curve fitting is used to analyze Ni 2p spectra obtained from various nickel-oxygen compounds and Ni/Al2O3 catalysts.
Abstract: Nonlinear least-squares curve fitting is used to analyze Ni 2p spectra obtained from various nickel-oxygen compounds and Ni/Al2O3 catalysts. Apart from NiO, which shows a characteristic discrete satellite peak 2 eV from the main 2p3/2 peak, all other spectra exhibit variable peak asymmetry assigned to multiplet splitting effects. By the use of a single extra peak to describe this asymmetry, the relative satellite/main peak intensity ratio can be used as an indication of the chemical state of nickel. Results for Ni/Al2O3 catalysts agree with reduction studies from previous work about the nature of nickel species on the surfaces of these catalysts at various nickel loadings.
165 citations