Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 2176 for “"catalysts"”.
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Graphite-conjugated catalysts : bridging heterogeneous and homogeneous catalysts
… heterogeneous or molecular homogeneous electrocatalysts. Metallic heterogeneous catalysts have a continuum of electronic states that distribute the redox burden of multielectron reactions, allowing for efficient catalysis. However, heterogeneous catalysts display a variety of active sites and …
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Development and applications of enantioselective organometallic catalysts : I. Organotin catalysts; and, II. Planar-chiral nitrogen heterocyclic catalysts
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.
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Organometallic Polymerization Catalysts
… initiated by vanadium-based Ziegler-Natta catalysts, the most active of which was formed from VOC1₃/A1Et1.5Cl1.5 and was the most active also for the copolymerization of ethylene and propylene. A dilatometric study of the polymerization, using a device that could be filled rapidly, showed …
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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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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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Gold based electro catalysts
Gold electrocatalysts have been of growing interest in recent years owing to their reactivity for a variety of important reactions such as the oxygen reduction reaction. This activity has been shown to be dependent on the size of the supported electrocatalyst nanoparticles. In this thesis the …
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Catalysts for H2 production
The research of new catalysts for the hydrogen production described in this thesis was inserted within a collaboration of Department of Industrial Chemistry and Materials of University of Bologna and Air Liquide (Centre de Recherche Claude-Delorme, Paris). The aim of the work was focused on the …
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Hybrid bio-templated catalysts
… samples. Both nanowire and nanoparticle catalysts formed using these techniques showed excellent performance at only 300 C, and nanowires showed significantly improved resistance to deactivation over time on-stream. This study suggests that the use of biotemplating in the production of …
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Vanadium interaction with FCC catalysts
Fluidised cracking catalysts, which contain a form of zeolite-Y as the main catalytically active component, are widply used commercially for the conversion of crude oil into more profitable product streams. During the cracking reaction, these catalysts are contaminated with vanadium which has a …
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Ageing Mechanisms in Automotive Catalysts
Due to the slow and expensive nature of on-road and on-engine ageing, laboratory ageing and testing methods are becoming increasingly important, as well as mathematical catalyst simulation models. With the regulations concerning automotive emissions becoming more and more stringent it is important …
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CoMFA Study of Chiral Catalysts
… Analysis (CoMFA) is developed for a set of 23 catalysts containing bis-oxazoline or phosphino-oxazoline ligands that are known to induce asymmetry during the Diels-Alder reaction of N-2-alkenoyl-1, 3-oxazolidine-2-one with cyclopentadiene. It is shown that extemely high q2 statistics can be …
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Single-chain nanoparticle based catalysts
… Several single-chain nanoparticle (SCNP) catalysts have been developed to perform copper(I)-mediated alkyne–azide cycloaddition (CuAAC), “click” reactions, or the photoreduction of azido groups to amines. The nanoparticles are shown to have significantly higher activity when compared to …
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Nickel deposition on hydrodemetallation catalysts
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1993.
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Evaluation of aged woodstove catalysts
… and procedure for the evaluation of woodstove catalysts was developed to verify the accuracy of the field test. Bench tests were performed on 24 aged catalysts retrieved from the field-tested stoves. In the bench test, steady-state conversions of CO and propene were measured at discrete …
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The redispersion of supported metal catalysts
Call number: LD2668 .T4 1978 H347
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Hydrothermal aging of zeolite-based catalysts
… scale fluidized bed. Fresh and steam-aged catalysts were characterized by surface area reduction using the nitrogen BET and t-Plot surface area methods. The surface morphology was apparent from the scanning electron photomicrographs. An irreversible deactivation kinetic model developed …
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Catalysts and Triggers in Lifelong Learning
This thesis aims to understand the catalysts and triggers that influence engagement in lifelong learning amongst adult learners undertaking access courses in the South Wales Valleys. As they are conceptualised within this thesis, catalysts and triggers pertain to how returners to formal learning …
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Enhanced structural characterisation of supported catalysts
… size and shape of carbon supported nanoparticle catalysts. Both monometallic (Pt or Au) and bimetallic (PtPd) catalysts were studied. In the first results chapter the strengths and weaknesses of various structural characterisation methods, TEM, XRD and EXAFS were explored. Subsequent chapters …
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URBAN CHOREOGRAPHIES BANGKOK'S CATALYSTS TRANSFORM NEIGHBOURHOODS
… of the significant drivers of change, urban catalysts in the form of small institutions with community characteristics (families) and social bonds (guanxi) which turn into business and policy coalitions revealed that they institute a building culture, which is flexible and adaptable to …
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