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Showing 1 to 20 of 21 for “"Supported metal catalysts"”.
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The redispersion of supported metal catalysts
Call number: LD2668 .T4 1978 H347
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Dehydrogenation of anthrahydroquinones over supported metal catalysts
Includes bibliographical references (pages 130-135).
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Supported metal catalysts for water-gas shift conversion
… monoxide, which is a poison for the platinum catalysts within fuel cells, into carbon dioxide. If the CO concentration required is extremely low, a methanation or preferential oxidation stage can be used subsequent to the WGS stage. This study focuses on the water-gas shift stage of the fuel …
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The reductive animation of ethanol using supported metal catalysts
Silica supported cobalt, nickel and copper are efficient catalysts for the reductive amination of ethanol using ammonia. High selectivity to ethylamine product was obtained between reaction temperatures of 140 and 200°C, between ammonia to ethanol molar ratios ranging from 1 to 4 and between …
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A Study on Supported Metal Catalysts Prepared from Colloidal Precursors
When metal nanoparticles are supported on the surface of an inert carrier, the resulting materials can become powerful heterogeneous catalysts capable of accelerating a diverse range of chemical reactions. Though there are a wide variety of synthetic routes by which these materials can be prepared, …
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Rational Design of Supported Metal Catalysts for Carbonyl Reduction During Biomass Upgrading
… hydrogenation, acetone hydrogenation over supported Pt catalysts in the gas-phase fixed bed reactor was investigated to understand both the mechanism and rate controlling steps in a fundamental level. The experiments and outcomes include the detailed macro- and micro-kinetic analysis of …
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Structure-activity relationships for the water-gas shift reaction over supported metal catalysts
… undertaken, such as (i) effect of transition admetals on the WGS catalysis by molybdenum carbide (ii) effect of residual oxygen content on the performance of molybdenum carbide for WGS (iii) effect of cobalt as a secondary metal promoter over supported Pt catalysts. ^ In the first study, we were …
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Infra-red studies of carbon monoxide and hydrogen absorbed on silica supported metal catalysts
… of carbon monoxide and hydrogen on silica supported nickel, cobalt, and iron catalysts was studied using infrared spectroscopy. The products occurring in the gas phase, as well as spectra of adsorbed CO surface species in the frequency range 2300 - 1700 cm−¹ for different order of addition …
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The growth and characterisation of supported metal catalysts prepared by novel chemical vapour deposition methods
… for the preparation for thepreparation of supported gold catalysts using dimethyl goldacetylacetonates Me 2 Au(acac) as the volatile precursor. Preliminaryexperiments on the use of TCVD for the preparation of coppercatalysts from copper acetylacetonate Cu(acac) were also performed.The …
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Some properties of silica-supported nickel catalysts
… found to influence 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 …
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Properties of Bimetallic Catalysts Prepared From Alumina Supported Mixed Metal Catalysts
Supported bimetallic catalysts represent an important class of commercial catalysts. Despite intensive study, a great deal remains to be learned about these systems. One difficulty associated with the characterization of supported metal catalysts is the variability of sites. Classically prepared …
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The use of coherent anti-Stokes Raman Spectroscopy as a diagnostic technique for studying the hydrogenation of carbon moxide in a tube-wall reactor
… to study the methanation reaction over various supported metal catalysts in a simple tube-wall flow reactor using CARS. The metals, nickel,cobalt and ruthenium were used to catalyse the methanation reaction. These were loaded onto various amorphous and zeolitic supports using typical ion …
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High-temperature microfluidic systems for thermally-efficient fuel processing
… and combustion of various fuels over washcoated supported-metal catalysts have been investigated.
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Graphene-Supported Metal Nanoparticles For Applications in Heterogeneous Catalysis
… good candidate as an effective solid support for metal catalysts. The Nobel Prize in Physics for 2010 was awarded to Andre Geim and Konstantin Novoselov "for groundbreaking experiments regarding the two-dimensional material graphene". Microwave-assisted synthesis of various metallic nanostructured …
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Structure Sensitivity of Alkane Hydrogenolysis on Ir/MgAl₂O₄ Catalysts
… systems, the catalytic performance of a metal supported catalyst would be affected by the size and shape of the metals, and this phenomena is called structure sensitivity. Generally, the structure sensitivity effect is considered being led by a combination of geometric property change and …
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Synthesis and Activation of Nanoscale Dendrimer-Derived Supported Noble Metal Catalysts
… been used as templates for the preparation of supported metal catalysts. This approach takes advantage of several unique characteristics of these dendrimers such as the ability to complex metal cations in solution and to protect them from aggregation until they are impregnated onto a support. …
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Lignin Transformation and Characterization of Pyrolytic Products
… Mineral bases, such as NaOH and CsOH, or supported-metal catalysts (Pt, Ru, Pd, and Ni on C) have been used to form aromatic monomers, but associated drawbacks are corrosion, catalyst recovery, sintering of metals, and loss of activity. Lignin conversion into useful aromatic compounds is …
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Interactions of biomass derived oxygenates with heterogeneous catalysts in aqueous and vacuum environments
… solvent for biomass upgrading reaction schemes. Metal oxide and metal oxide supported catalysts are heavily used in oil refining and petrochemical production, and are capable of upgrading biomass molecules as well. However, the surface chemistries that dictate the behavior of aqueous phase …
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Combining Experiments and First-Principles Calculations to Understand and Engineer Metal Exsolution in Perovskites
… to fabricate highly active and stable ceramic-supported metal catalysts for a wide variety of applications, including solid oxide fuel cells, solid oxide electrolyzers, catalytic converters, and chemical/fuel production. In exsolution, metal cations are exsolved to the surface of a perovskite …
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Structure Sensitivity of Alkanes Hydrogenolysis and Alkynes Hydrogenation on Supported Ir Catalysts
… systems, the activity and selectivity of supported metal catalysts or extended metal surface catalysts would be affected by the metal surface structure, and this phenomenon is called structure sensitivity. Generally, structure sensitivity is led by the change of geometric and electronic …
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