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Showing 1 to 19 of 19 for “"Selective Hydrogenation"”.
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Selective hydrogenation for industrial 1-hexene purification
Previous reports identified selective catalytic hydrogenation as a possible route to the purification of industrial 1-hexene streams. Even so, reported performance has been poor and, consequently, the principal aim of this study is to adjust operating conditions so as to improve process performance …
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Selective hydrogenation for industrial 1-hexene purification
Previous reports identified selective catalytic hydrogenation as a possible route to the purification of industrial 1-hexene streams. Even so, reported performance has been poor and, consequently, the principal aim of this study is to adjust operating conditions so as to improve process performance …
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Alumina-supported palladium and palladium/copper catalysts: Characterization and use for selective hydrogenation of 1,3-butadiene
… this impurity is substantially eliminated by selective catalytic hydrogenation, there is a considerable economic incentive to improve the currently employed palladium-based catalysts. The purpose of this research has been to investigate the effects of adding copper to alumina-supported …
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The ultra-selective hydrogenation of Furfural on PtCu supported bimetallic nanoparticles and on Pt(111) under ultra-high vacuum
The selective transformation of furfural, a biomass platform molecule, was studied on Pt based heterogeneous catalysts and model single crystal surfaces. Hydrogenation reactions were carried out at pressures ranging from ultra-high vacuum to 20 bar. Temperature Programmed Desorption data in …
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Selective hydrogenation of α,β[alpha,beta]-unsaturated aldehydes towards clean synthesis over noble metal catalysts in mass transfer efficient three phase reactors
… bubble column as a catalytic reactor for the hydrogenation of α,β-unsaturated aldehydes. Oxygen/water was used as the system throughout. In order to obtain reproducible results, a very effective gas-liquid separation method was conceived and developed after much trial and error work. Shutdown …
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Role of adsorption in catalysis: applications of NMR relaxometry
… were applied in the study of liquid phase selective hydrogenation of citral on 5% Pt/SiO2. Infrared (IR) spectroscopy, volumetric adsorption isotherms, dynamic isotherms via a Tapered Element Oscillating Microbalance (TEOM), temperature programmed desorption (TPD) as well as 13C T1 NMR and …
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Studies on the total synthesis of gambierol via endo-selective epoxide-opening cascades
… 1 steps, respectively, using water-promoted endo-selective epoxide-opening cascades to construct the poly-THP motifs. The concentration and temperature effects in the waterpromoted cascades were examined, and an operationally simple protocol was developed for the synthesis of polycyclic cascade …
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Experimental and modeling studies using packed bed reactors: Liquid phase ethylene production by hydrogenation of acetylene
<p>"Gas-phase catalytic hydrogenation of acetylene to produce ethylene, commonly practiced in industries, has green oil formation, which leads to catalyst deactivation and sometimes reactor runaway risks due to high exothermicity. To overcome these issues as well as to increase the selectivity and …
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Surface Characteristics of Silica Polyamine Composites
… on SPC materials were investigated for olefin hydrogenation activity. Hydrogenation of monoenes and dienes was investigated and found comparable to currently used catalysts in some cases. The most potentially useful result of this catalysis work was the selective hydrogenation of a conjugated …
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Surface Characteristics of Silica Polyamine Composites
… on SPC materials were investigated for olefin hydrogenation activity. Hydrogenation of monoenes and dienes was investigated and found comparable to currently used catalysts in some cases. The most potentially useful result of this catalysis work was the selective hydrogenation of a conjugated …
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Phosphate Tethers in Synthesis: The Total Synthesis of Dolabelide C.
… C the bicyclic phosphate tether mediates a selective cross metathesis with the terminal exocyclic olefin, differentiates the endocyclic and exocyclic olefins for selective hydrogenation, and serves as a leaving grouping for a regioselective palladium(0)-catalyzed hydride opening. Upon …
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DESIGN, SYNTHESIS, AND OPTIMIZATION OF SMALL-MOLECULE CD4 MIMETICS AS HIV-1 ENTRY INHIBITORS AND SYNTHETIC EFFORTS TOWARD THE TOTAL SYNTHESIS OF NAHUOIC ACID Cii
… as the only natural products reported to selectively and competitively inhibit the histone methyltransferase SETD8, a key epigenetic regulator implicated in cancer progression. Their stereochemical complexity and biological potential have made them compelling synthetic targets. This work …
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Thermal and electron stimulated chemistry of complex adsorbates on metal surfaces
… onto a metal surface. The prototypical enantio-selective heterogeneously catalysed reaction involves the hydrogenation of the α-ketoester, methyl pyruvate on Pt. Using TPD, XPS and UPS we have investigated this compound’s behaviour on a model Cu(111) single crystal surface. Monolayers of methyl …
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Fundamental Understanding of Palladium-Based Catalysts: From Pyrene-Based COFs to Size-Controlled Bimetallic Nanostructures
… range of industrial chemical processes. Ethylene hydrogenation has long been used as a model reaction in heterogeneous catalysis to better understand the mechanism of selective acetylene hydrogenation over metal catalysts. Improving selectivity often depends on how strongly the reactants adsorb …
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Design of Robust Heterogeneous Catalysts for Sustainable Chemistry
… NMR, PXRD and TEM) and applied in catalytic hydrogenation reactions. The activity of the catalysts was found low because of the silicidation of metal and non-porous SiCN support. The issues of the low porosity of SiCN ceramics and the formation of metal silicides were addressed in the …
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Non-traditional catalysis by plasmonic nanostructures
… applications, including CO2 reduction and selective hydrogenation. One appeal of these materials is their ability to interact with light, whether through plasmonic excitation, bandgap transitions, or defect-mediated absorption, raising questions about how light influences their catalytic …
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The catalytic hydrogenation of carbon-carbon and carbon-nitrogen multiple bonds by a cobalt(I) complex
… transition metal complexes for the catalytic hydrogenation of carbon-carbon multiple bonds can be attributed to the well-defined reactivity, stability and overall high activity of such catalytic systems. The development of sustainable, more abundant and relatively less toxic late first-row …
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Green Diesel Production Via Catalytic Hydrogenation/decarboxylation Of Triglycerides And Fatty Acids Of Vegetable Oil And Brown Grease
… costs. This thesis proposes a new technology- selective decarboxylation of brown grease, which is a mixture of fats and oils collected from waste water trap and rich in fatty acids, over a supported noble metal catalyst that overcomes the green diesel production challenges. In contrast to other …
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Preparation, Characterization and Evaluation of Bimetallic Catalysts Prepared by Electroless Deposition Methods
… surfaces were thoroughly characterized using selective chemisorption, atomic absorption spectroscopy (AAS), Fourier transform infrared spectroscopy (FTIR) of adsorbed CO and X-ray photoelectron (XPS) spectroscopy techniques for possible structural and/or electronic interactions between …