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 50 for “"HDS"”.
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Effects of Ni Promotion and Chelating Reagent On thePreparation, Structure and Performance of Molybdenum-Based Hds Catalysts
… technologies of ultra-deep hydrodesulfurization (HDS) in petroleum refining industry is increasing due to stringent and tightening environmental regulations regarding the sulfur content of diesel fuels. Thus, there is a very strong incentive to develop the next generation of highly active HDS …
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The kinetics and mechanisms of the oxidation and precipitation of iron : the high density sludge (HDS) process
… (AMD) by the high density sludge process (HDS). The removal of other pollutants by adsorption and coprecipitation using this technique depends on the nature and the process by which iron is removed. Although this technique is cheap and easy to operate and therefore the most common method by …
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Rate and predictors of decline in dementia of the Alzheimer type as measured by the hierarchic dementia scale (HDS)
… as measured by the Hierarchic Dementia Scale (HDS) based on the risk factors of age of symptom onset, education, gender, and place of residence. It was hypothesized that younger age of symptom onset would predict a faster rate of decline on the total HDS score and in the seven cognitive domains …
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Synthesis And Characterization Of Size Controlled Transitionmetal Phosphide Nanoparticles And Their Hydrodesulfurization Catalytic Activity
… promising catalysts for hydrodesulfurization (HDS). The size-dependent catalytic activity of these metal phosphides for hydrodesulfurization (HDS) remains unstudied because the traditional temperature programmed reduction (TPR) method used in catalyst preparation results in highly polydisperse …
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The cognitive functioning of dementia patients : an examination of the hierarchic dementia scale, and the impact of cognitive functioning on caregiver burden and desire to institutionalize
… by using the Hierarchic Dementia Scale (HDS), and examine the impact of cognitive functioning on caregiver burden and desire to institutionalize the patient. It was hypothesized that the HDS would be a valid and reliable measure of patient cognitive functioning, would differentiate among …
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Cyclopentadienyl ruthenium sulfide carbonyls and thiophene activation by iron and rhodium
… the objective of catalytic hydrodesulfurization (HDS), one of the largest applications of transition-metal catalysis. However, the specific mechanism for the process is not well understood. This thesis addresses certain aspects of HDS research from an organometallic perspective.
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RECYCLING OF WASTE BLOOD INTO FUNCTIONAL CARBON NANOPARTICLES
… carbon nanoparticles (Hemodots, HDs) with potential biomedical applications. The study addresses challenges in blood waste management and explores alternative anticoagulant therapies. Through a hydrothermal process, optimal conditions for HD synthesis were identified at 230°C for …
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Reduced molybdenum oxidation states in hydrodesulfurization catalysis by Chevrel phases
… and benzothiophene hydrodesulfurization (HDS) and 1-butene hydrogenation (HYD). These materials have been found to have HDS activities comparable to, or greater than, model unpromoted and cobalt-promoted MoS[subscript]2 catalysts; in contrast, Chevrel phases exhibit low activities for …
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Spectroscopic and Kinetic Studies of Hydrodenitrogenation and Hydrodesulfurization over Supported Nickel Phosphide (Ni₂P)
… and their application in hydrodesulfurization (HDS) and hydrodenitrogenation (HDN). The work carried out includes synthesis of Ni₂P on different siliceous supports, SiO2 and MCM-41. It also includes characterization of these catalytic materials using X-ray diffraction (XRD), …
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Cyclopentadienyl ruthenium chalcogenides
… relevance to metal sulfide hydrodesulfurization (HDS) catalysts. Ruthenium sulfur complexes are of interest because of the favorable catalytic properties of RuS$\sb2$ which can act as HDS catalyst as well as an electrocatalyst. The purpose of this thesis was to synthesize, characterize, and study …
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Catalytic Hydrogenation and Hydrodesulfurization of Model Compounds
… became the major product, especially with HDS catalysts like CoMoS/Al2O3 and WP/SiO2, which indicates that poisoned or modified conventional HDS catalysts would be good candidates for further 2MT hydrogenation studies. The role of tetrahedral Ni(1) sites and square pyramidal Ni(2) sites in …
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Developing an interactive overview for non-visual exploration of tabular numerical information
… technique called High-Density Sonification (HDS), which facilitates the process of extracting overview information from the data easily and efficiently by rendering multiple data points as single auditory events. Beyond obtaining an overview of the data, experimental studies showed that the …
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Co-factors of LIM-HD transcription factors in neural development and axon pathfinding in zebrafish
… factor signaling. LIM homeodomain proteins (LIM-HDs) are an important class of transcriptional regulators and involved in neural development as well as neuron fate decision in vertebrates. DD domain dimerization of CLIM (cofactor of LIM-HDs) can activate LIM-HDs and downstream gene transcription …
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Synthesis and characterization of Ir(III) metallacycles derived from thiophene and related compounds: models for the hydrodesulfurization process
… which occur inside hydrodesulfurization (HDS) reactors. Information obtained from these model studies may often be applied to understanding the mechanisms involved with commercially used catalysts. Certain mechanisms¹ for HDS propose thiophene ring cleavage,forming a metallacycle, prior to …
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ΜΕΛΕΤΗ ΤΗΣ ΑΠΟΔΡΑΣΤΙΚΟΠΟΙΗΣΗΣ ΚΑΤΑΛΥΤΩΝ ΚΑΤΑ ΤΗΝ ΥΔΡΟΓΟΝΟΑΠΟΘΕΙΩΣΗ ΥΠΟΛΕΙΜΜΑΤΩΝΑΠΟΣΤΑΞΗΣ ΑΡΓΟΥ ΠΕΤΡΕΛΑΙΟΥ ΘΑΣΟΥ
AN INVESTIGATION OF THE INTRINSIC KINETICS OF THE HDS OF ATMOSPHERIC RESIDUE OBTAINED FROM GREEK CRUDE OIL (THASSOS) CARRIED OUT WHILE AT THE SAME TIME CATALYST DEACTIVATION PHENOMENA WERE QUANTIFIED. A LABORATORY CHEMICAL REACTOR EQUIPPED WITH FOUR CATALYST BASKETS AND OF TOTAL INTERNAL VOLUME OF …
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Técnica baseada em contratos para a validação da comunicação de alto nível entre software e hardware
… do uso de software dependente de hardware (HdS). Uma vez que HdS é um componente altamente crítico e propenso a erros devido à natureza do ambiente no qual está inserido e a sua difícil codificação, é importante que as fases de desenvolvimento e de operação destes componentes sejam …
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ROLE OF NATURAL KILLER CELLS IN THE PATHOGENESIS OF PRIMARY BILIARY CHOLANGITIS
… cell subsets in PBC patients and healthy donors (HDs) by single-cell RNA sequencing (scRNAseq); we also investigated differences in the transcriptomic profile of NK cells from PBC patients stratified based on their response to UDCA. By using a 23-color flow cytometry panel, we characterized and …
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Reactivity and Structure of Supported Nickel Phosphides (Ni₂P) in Deep Hydrodesulfurization Catalysis
… their application in deep hydrodesulfurization (HDS) of a model sulfur compound, 4,6-dimethyldibenzothiophene (4,6-DMDBT), one of the most refractory S-compounds. This topic is of great importance in addressing recently enacted environmental regulations limiting the sulfur content in fuels. The …
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Thiophene derivatives of rhenium and titanium
… organometallic modeling of hydrodesulfurization (HDS). These studies have typically utilized late transition metals with high d-electron counts. This thesis focuses on three areas, (i) the synthesis of high oxidation state metal-oxo derivatives of thiophene, (ii) the exploration of the reactivity …
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