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Showing 1 to 16 of 16 for “"Nickel catalysts"”.
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Some properties of silica-supported nickel catalysts
… the catalytic activity of supported metal catalysts. In particular an interaction has been shown to exist between the metal and its support in these catalysts. Two of the important factors which were shown to affect activity are the average metal crystallite size and the fraction of the …
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In situ sintering study of model nickel catalysts
Lipid catabolism plays a significant role in the survival of M.tb inside the host. The development of analytical techniques such as gas chromatography mass spectroscopy (GCMS) and liquid chromatography mass spectroscopy (LC-MS) has become popular as metabolomics tools in the study of such catabolic …
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Atomic/molecular layer deposition prepared size-selective catalysts and supported nickel catalysts
<p>"Heterogeneous catalysts are widely used because of their many advantages. In this dissertation, the application of atomic/molecular layer deposition (ALD/MLD) in heterogeneous catalyst synthesis and modification was examined.</p> <p>A novel nanostructured size-selective catalyst was synthesized …
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Phase and structural changes of nickel catalysts as a function of reaction conditions
… in comparison to the other active metals. Ni catalysts have been extensively studied due to their uses in steam reforming and CO methanation, and it is known that deactivation by sintering, sulphur poisoning and carbon formation are the most common deactivation mechanisms for Ni catalysts. …
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Robust Nickel Catalysts Supported By Biaryl-Bridged Pyridyl-N-Heterocyclic Carbenes For Carbon Dioxide Reduction To Value-Added Products
… reduction involves the design of new homogeneous catalysts with tunable geometries and polyaromatic frameworks with increased delocalization to lower overpotentials for catalysis. We report a family of biaryl-bridged pyridyl-N-heterocyclic carbene-based ligands and their corresponding nickel …
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Impacts of Vanadium and Coke Deposition on CO2 Gasification of Nickel Catalysts Supported on Activated Carbon from Petroleum Coke
One of the ways to dispose of spent carbon-based catalysts is gasification. In this study, the kinetics of CO2 gasification of Ni/activated carbon (AC) catalysts, produced from petroleum coke, were investigated at 700-900 °C using a thermogravimetric analyzer (TGA). The catalysts were coked by …
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The development of a model for high pressure propene oligomerisation over H-ZSM-5
… revises the characteristics and applications of catalysts which have been shown to be active for oligomerisation. This is further split into acid catalysts, heterogeneous nickel catalysts, other transition metal catalysts and finally homogeneous metal catalysts. The next section covers the …
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Iron-Based Alloys as Catalysts for CO2 Hydrogenation
… performance of a range of iron-based bimetallic catalysts in promoting CO2 hydrogenation. Specifically, iron-nickel, iron-cobalt and iron-copper supported on βsilicon carbide were studied. It had been reported that these materials were more active and selective towards long chain hydrocarbons …
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The sintering and stability of catalytic nano-particles
Studies were performed on three different catalysts in order to determine their stability and sintering behavior. Pd deposited on a flat single crystal substrate made of Al2O3 was characterized to determine if the mechanism of Ostwald ripening was solely dominated by vapor phase transport of metal …
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The Challenge of Selectivity in Ethylene Oligomerization: Ligand Design and Metal Valence States
… has been developed with the use of chromium catalysts. Commercial systems producing selective tri/tetramerization, non-selective oligomerization and polymerization are all based on this metal with the exception of a few systems based on other transition metals (Zr, Ti, Ni etc.). This …
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New methodologies and approaches to reaction discovery in transition metal catalysis
… has been developed. Simple palladium catalysts enable the coupling of aryl boronate esters formed from iridium-catalyzed C-H borylation to be coupled with various allylic halides, allylic carboxylates and benzylic halides. Nickel catalysts bearing diamine or phenanthroline- based …
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Metal oxide supported iron-nickel nano-alloys in the reverse water-gas shift reaction
… and there is a need for low temperature catalysts with a high CO selectivity. Noble metal catalysts have been well studied for the RWGS, though affordable and abundant metals are required for large-scale applications. Iron-based catalysts have been widely explored due to their high …
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Μελέτη της ρόφησης υδατικών συμπλόκων του νικελίου στην επιφάνεια του οξειδίου του τιτανίου
Βασικός στόχος της παρούσας διατριβής είναι η αποσαφήνιση του τρόπου της διεπιφανειακής εναπόθεσης του νικελίου στην επιφάνεια της τιτάνιας, η οποία λαμβάνει χώρα στη διεπιφάνεια “τιτάνιας / ηλεκτρολυτικού διαλύματος”. Ο στόχος αυτός επιτεύχθηκε μέσω μιας κατάλληλης θεωρητικής και υπολογιστικής …