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Showing 1 to 11 of 11 for “"Bifunctional Catalyst"”.
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Design of heterogeneous bifunctional catalyst for upgrading bioethanol through the Guerbet reaction
… chemicals. A selective and stable heterogeneous catalyst is required to render this conversion possible in an economic way. The reaction was found to proceed through two parallel mechanisms on basic magnesia where acetaldehyde, formed from ethanol dehydrogenation, can either couple with itself or …
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ASYMMETRIC ORGANOCATALYTIC HENRY REACTION OF β–SUBSTITUTED α-KETO ESTERS VIA DYNAMIC KINETIC RESOLUTION
… a-keto esters using cinchona alkaloid derived bifunctional catalyst via dynamic kinetic resolution. Chapter 1 presents a brief historical background and development of asymmetric catalysis. Particularly, the asymmetric organocatalysis is introduced in detail. Then the historical background and …
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Exploring Design Opportunities of Bifunctional Catalysts Using Density Functional Theory and Microkinetic Modeling
Several examples of catalysts that perform multiple site-specific functionalities under steady-state reaction conditions have been reported in the literature. The most common systems are bifunctional catalysts where each of the two distinct sites catalyzes different reaction steps independently. …
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The effect of metal type and loading on n-paraffin hydrocracking conversion and selectivity
… Hydrocracking may be carried out using a bifunctional catalyst, consisting of metal and acid components. Industrially, hydrocracking is used to crack heavy crude oil fractions into the desired fuel range, however, the catalysts used are sulphided transition metals. These are less suitable …
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Scaling down direct dimethyl ether synthesis for biogas conversion
… over CuO/ZnO/Al203 (CZA) and 1 % Au/CeZr04 catalysts and it was found that the gold based catalysts are superior to the copper based catalysts for low temperature WGS. The kinetics of the WGS reaction over fresh gold based catalyst and the deactivation kinetics model was then studied. It was …
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Synthesis And In-Situ Charactorization Of Energy Storage Material
… reaction site and metal oxides serves as the catalyst which can lower the activation energy of Li2O2 decomposition reaction energy so that the cyclability and the energy efficiency of the battery can be improved. The 2-D graphene and metal oxide composite made for supercapacitor are …
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Fast microwave-assisted thermochemical conversion of biomass for biofuel production
… syngas to dimethyl ether (DME) on various bifunctional catalysts. In Chapter 2, the microwave heating characteristics of various biomass feedstocks and microwave absorbents were examined and compared. Experimental results show that microwave absorbents absorbed the microwave irradiation …
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Design, synthesis and evaluation of organocatalysts in 1,4-conjugate additions to nitroolefins and alkylidene malonates
… and thiourea pyrrolidine-based organocatalysts were synthesised and fully characterised. Their catalytic activity and selectivity in 1,4-conjugate additions involving the Michael acceptor, nitrostyrene, was evaluated. Thiourea catalysts based upon the cinchona alkaloid framework were …
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Rational Catalyst Design for Direct Conversion of CH4 and CO2
… pathways over active centers on heterogeneous catalysts needs to be advanced. To that end this work focused on initiating the development of a bifunctional catalyst for low-temperature: 200C - 450C) direct conversion of methane and carbon dioxide by tailoring the structure of each active …
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Conversion of methyl ethyl ketone (MEK) to valuable chemicals over multifunctional supported catalysts
… of MEK to butene over supported copper catalysts (Cu-Al₂O₃, Cu-zeolite Y sodium (Cu-ZYNa) and Cu-zeolite Y hydrogen (Cu-ZYH)) in a fixed bed reactor. In this reaction, MEK is hydrogenated to 2-butanol over metal sites, and further dehydrated on acid sites to produce butene. Experimental …
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Simultaneous production of methanol and dimethylether from synthesis gas
… by hydrogenation of CO/CO2 over a copper based catalyst and subsequent dehydration of methanol to DME over an acidic catalyst. Alternatively, DME can be produced in an one-step (direct) process using a hybrid (bifunctional) catalyst system that permits both methanol synthesis and dehydration in …