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Showing 1 to 20 of 34 for “"bimetallic catalysts"”.
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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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Metallic and bimetallic catalysts for electrochemical reduction of problematic aqueous anions
Metallic and bimetallic systems are investigated voltammetrically as possible catalysts for the electrochemical reduction of nitrate. Iindium and palladium are the most thoroughly examined metals in this work, but nickel, tin, platinum, thallium, lead, and gallium are also incorporated into the …
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Preparation, Characterization and Evaluation of Bimetallic Catalysts Prepared by Electroless Deposition Methods
<p> Bimetallic catalysts have replaced many monometallic catalysts for a wide range of catalytic applications, due to their enhanced selectivity, stability, and/or activity relative to their corresponding monometallic components. These bimetallic catalysts are typically prepared using precipitation …
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Model systems for the study of active phase evolution in complex bimetallic catalysts (PdZn)
… platform for the study of complex multimetallic catalysts. The use of the silica as a TEM support combined with aberration corrected HRSTEM, EDX, XPS and Raman allowed for a very detailed look into PdZn nanoparticle formation from (Pd,Zn)O → α-Pd → β1-PdZn → Pd2Zn and back to α-Pd. This study …
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Structure and activity relationships of bimetallic catalysts for aqueous phase reforming and the water-gas shift reaction
… carbohydrates. In the first study Pt/MWCNT catalysts have been promoted by addition of transition metal promoters Cu, Ni, Co, Fe, Mn, Mo, W, and Re in Pt:M 1:1 atomic ratios to give up to 13 times higher glycerol reforming site time yield (STY) and 8 times higher water-gas shift (WGS) …
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Mechanistic Study of Fouling and Regeneration of Palladium-Based Bimetallic Catalysts Used for the Removal of Pollutants From Drinking Water
… health effects in humans. Palladium-based bimetallic catalysts hold promise as a potential technology for the removal of nitrate from drinking water. The success of catalytic nitrate reduction however is dependent on the longevity of the catalyst. The primary goals of this work were to …
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Spatially Resolved Species and Temperature Profiles in the Oxidative Dehydrogenation of Ethane on Mono and Bimetallic Catalysts at Short Contact Times
… of C2H6 to C2H4 was studied on monometallic and bimetallic 45 PPI foam monoliths at ~8ms contact time. The capillary sampling method was used to measure concentration and temperature profiles along the reactor. Pt and Rh showed quite different product distributions; Rh was highly selective to …
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High-Pressure Vapor-Phase Catalytic Hydrodeoxygenation of Lignin-Derived Compounds to Hydrocarbons on Bimetallic Catalysts in the Range of 0.2-2.4 MPa.
… used to gain an understanding of how various catalysts performed at removing specific oxygen functional groups present in lignin (such as etheric methoxy and phenol groups), to investigate the HDO reaction pathways of these catalysts, and to apply this understanding to develop improved HDO …
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Nuclear magnetic resonance study of the Pt-Rh bimetallic clusters
We report the study of supported Pt-Rh bimetallic catalysts by 195Pt NMR and by 13C NMR of adsorbed CO. The metal particles are sA-soA in diameter. Study of the dependence of the 13CO resonance position as a function of Pt/Rh ratio and particle size shows that Rh is segregated to the surface. Study …
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Nuclear Magnetic Resonance Study of the Platinum - Rhodium Bimetallic Clusters
We report the study of supported Pt-Rh bimetallic catalysts by $\sp{195}$Pt NMR and by $\sp $C NMR of adsorbed CO. The metal particles are 5A-50A in diameter. Study of the dependence of the $\sp $CO resonance position as a function of Pt/Rh ratio and particle size shows that Rh is segregated to the …
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Alumina-supported palladium and palladium/copper catalysts: Characterization and use for selective hydrogenation of 1,3-butadiene
… improve the currently employed palladium-based catalysts. The purpose of this research has been to investigate the effects of adding copper to alumina-supported palladium to enhance the selectivity of palladium for butadiene hydrogenation. 1,3-Butadiene semi-hydrogenation was studied in the …
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Synthesis of Platinum Dirhenium Dodecacarbonyl and Its Use as a Catalyst Precursor (Bimetallic, Rhenium, Heterogeneous)
… compound as a precursor to oxide-supported bimetallic catalysts offers the potential to control the composition of the resulting bimetallic particles. The reaction of HM(CO)(,5) (M = Re,Mn) with Me(,2)Pt(COD) (COD = 1,5-cyclooctadiene) in the presence of CO leads to the formation of the …
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A Study Of Electrocatalysis In The Oxygen Reduction Reaction Using OpenCatalyst, a Deep-Learning Platform.
… focus on the electrocatalytic properties of bimetallic catalysts—particularly palladiumgold alloys—and their potential to exceed the performance of traditional platinum-based systems. By utilizing Machine Learning (ML) methods as an alternative to Density Functional Theory (DFT), this study …
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Characterising catalyst preparation: from adsorbed precursor complex to catalyst particle
… examined using these characterisation methods. Bimetallic combinations of these precursors have also been prepared and characterised.<br/>The EXAFS showed that the ligand stays intact during adsorption onto the support and that it is lost during heating. The type of support used had an effect on …
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Mechanistic insights into the direct synthesis of H2O2 on transition metal catalysts
… synthesis to H2O2 on most transition metal catalysts, and so significant research has been directed towards improving catalyst selectivity towards H2O2 through various methods. Despite significant research, the mechanism of this reaction, and the reasons for the importance of seemingly …
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Accelerating Catalyst Discovery via Ab Initio Machine Learning
… to facilitate the discovery of high-performance catalysts. The framework, which integrates the descriptor-based kinetic analysis, material fingerprinting and machine learning algorithms, can rapidly explore a broad range of materials space with enormous compositional and configurational degrees …
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STM, LEED and photoemission studies of the Sn/Cu(100) surface alloys
The primary focus of this thesis is the study of bimetallic ordered surface alloys. Cu-based bimetallic catalysts show very useful properties, particularly in respect to their industrial applications, such as metal selectivity, structural stability and catalytic activity in comparison to their …
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Carboxylic Acid Hydrodeoxygenation over Supported Noble Metal Catalysts
… (HDO) over supported noble metal catalysts was carried out in order identify the main challenges associated with supported monometallic catalysts and identifying solutions that may increase the practicality of these high activity metals. Using propionic acid as a probe molecule, it …
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The hydrogenation of nitrobenzene over metal catalysts
… reaction was investigated, over a range of metal catalysts, to probe the mechanism of hydrogenation and catalyst deactivation. Initial investigations over Pd/C catalysts revealed the reaction to be sensitive to the solvent and the nature of the carbon support. However more importantly it was shown …
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Catalytic Studies Of Noble Metal Nanocatalysts Using Single-Molecule Fluorescence Microscopy
… metal nanoparticles are an important class of catalysts. However they are inherently heterogeneous, which makes studying them at the single-particle level desirable, as it then becomes possible to quantify these differences. A highthroughput fluorescence microscopy technique was developed in …
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