University of Nebraska-Lincoln
University of Tennessee at Chattanooga
University of South Florida
Reactor Performances And Hydrodynamics Of Various Gas-Solids Fluidized Beds,
2016
The University of Western Ontario
Reactor Performances And Hydrodynamics Of Various Gas-Solids Fluidized Beds, Jiangshan Liu
Electronic Thesis and Dissertation Repository
The reactor performances and hydrodynamics were systematically studied in a multifunctional fluidized-bed system which included a bubbling fluidized bed (BFB), a turbulent fluidized bed (TFB) as well as a newly identified circulating turbulent fluidized bed (CTFB) using the same batch of activated FCC particles. Catalytic ozone decomposition was employed as the model reaction to experimentally investigate the reactor performances of BFB, TFB and CTFB. The complete mappings of ozone concentration were obtained in these fluidized beds, showing close relationship with the solids holdup distributions. In the BFBs and TFBs, the study of scale-up effect revealed that the static bed height ...
Evaluation Of Voc Degradation In Photo-Catalytic Air Reactors: Tio2 Immobilization, Energy Efficiency And Kinetic Modeling,
2016
The University of Western Ontario
Evaluation Of Voc Degradation In Photo-Catalytic Air Reactors: Tio2 Immobilization, Energy Efficiency And Kinetic Modeling, Cristina S. Lugo Vega
Electronic Thesis and Dissertation Repository
The high VOC emissions from anthropogenic sources are detrimental to both the environment and humans, contributing with ground-level ozone and particle matter formation. Heterogeneous photocatalysis provides significant potential for VOC degradation. However, the approaches to be used for photocatalyst immobilization in scaled and highly efficient photoreactors are still not well established. Furthermore, there is a lack of reported photonic efficiencies and a shortage of required methods to establish these efficiencies.
To address these issues, this PhD Dissertation reports the study of photonic efficiencies, TiO2 immobilization on a stainless steel mesh and kinetic models in a scaled-up Photo-CREC-Air Reactor. Acetone ...
Microwave And Ultrasound Assisted Zeolitization Of Coal Fly Ash,
2016
The University of Western Ontario
Microwave And Ultrasound Assisted Zeolitization Of Coal Fly Ash, Syed Salman Raza Bukhari
Electronic Thesis and Dissertation Repository
Coal fly ash (CFA) is a major bi-product of coal fired power plants and is a liability for coal power industry. Coal fly ash has been accumulating rapidly around the globe and has been known to be accident prone, resulting in $1.65 billion in clean-up costs and fines. Given the environmental damage CFA is capable of causing, it is a great interest for scientists to recycle this material. Utilization of novel energy such as microwave and ultrasound has been of research interest for the zeolitization of coal fly ash.
This research produced zeolites from CFA utilizing microwave and ultrasound ...
Mechanism Of Ethanol Partial Oxidation Over Titania Supported Vanadia Catalysts: Geometric And Electronic Structure Consequences On Reaction Kinetics,
2016
The University of Western Ontario
Mechanism Of Ethanol Partial Oxidation Over Titania Supported Vanadia Catalysts: Geometric And Electronic Structure Consequences On Reaction Kinetics, Dongmin Yun
Electronic Thesis and Dissertation Repository
Supported vanadium oxide catalysts (VOx) are used for a wide range of industrial processes. A significant amount of research has been carried on this specific system with the aim to identify the critical parameters involved in catalytic activity. The results on this relative large body of research indicate that the catalyst support plays a critical role in determining the catalytic activity of vanadia and the use of titanium dioxide as support renders a catalyst with superior activity. Studies on supported vanadia on titanium oxide (VOx/TiO2) have provided an understanding on support interactions that result in tuning ...
Hydrophobic Zeolites For Applications In Adsorption And Catalysis,
2016
Purdue University
Hydrophobic Zeolites For Applications In Adsorption And Catalysis, Zige Huang, Michael Cordon, Rajamani Gounder
The Summer Undergraduate Research Fellowship (SURF) Symposium
Lewis acidic zeolites such as Sn-Beta are commonly studied for use as selective catalysts for glucose isomerization to fructose in liquid water. Glucose to fructose isomerization is a critical reaction for lignocellulosic biomass upgrading, which converts abundant and renewable feedstocks into commercially desirable fuels and chemicals.
Industrial applications require catalysts that maintain optimal reactivity over long time scales, yet at typical reaction temperatures, Lewis acidic Beta zeolites are known to deactivate in liquid water through poorly understood mechanisms. Recent work in our group has shown that interactions between water and Sn-Beta zeolites can cause leaching of active Sn sites from ...
Pt-Cu Catalysts For Catalytic Dehydrogenation Of Alkanes For Energy Production,
2016
Purdue University
Pt-Cu Catalysts For Catalytic Dehydrogenation Of Alkanes For Energy Production, Zixue Ma, Zhenwei Wu, Jeffrey T. Miller
The Summer Undergraduate Research Fellowship (SURF) Symposium
More active, selective and stable catalysts are in demand to increase the yields of olefins production from light alkane dehydrogenation. Cu was reported to promote Pt catalysts and Pt-Cu catalysts has been shown to achieve increased olefin selectivity and decreased deactivation rate. Pt-Cu catalysts with different Pt:Cu molar ratios may have different crystal structure and performance. This study seeks to understand of the promotion effect of Cu on Pt alkane dehydrogenation catalysts. Four different Pt-Cu catalysts with different atomic ratios were prepared and tested for propane dehydrogenation at 550℃. Synchrotron in situ X-ray diffraction and X-ray absorption spectroscopy are ...
Quantification And Characterization Of Aluminum Distributions In Commercial Beta And Mordenite Zeolites By Cobalt Exchange,
2016
Purdue University
Quantification And Characterization Of Aluminum Distributions In Commercial Beta And Mordenite Zeolites By Cobalt Exchange, Rebecca L. Reitzel, Claire T. Nimlos, Rajamani Gounder
The Summer Undergraduate Research Fellowship (SURF) Symposium
The aluminum distribution throughout the zeolite framework determines the structural, ion-exchange and catalytic properties of the zeolite. Several methods have been proposed to control the Al distribution, but in order to accurately assess these methods a procedure is needed to quantify Al distribution in various zeolite frameworks. Co2+ ions exchange onto the zeolite framework at Al pairs, and atomic absorbance spectroscopy (AAS) can be used to quantify the number of exchanged Co2+ ions and, in turn, the overall number of Al pairs. Each framework exhibits differences in pore size and channel configuration which affect the equilibrium conditions needed ...
Metal Assisted Chemical Etching,
2016
Quattrone Nanofabrication Facility
Metal Assisted Chemical Etching, Inayat Bajwa
Protocols and Reports
No abstract provided.
Particle Entrainment Studies From Dry And Wet Bed,
2016
The University of Western Ontario
Particle Entrainment Studies From Dry And Wet Bed, Saber Ayatollahi
Electronic Thesis and Dissertation Repository
During the Fluid Coking Process™ bitumen is sprayed into a fluidized bed of hot coke particles. The bitumen undergoes thermal cracking and is converted into gasses, condensable vapors, and solid coke, which deposits on the coke particles. These vapors rise through the vessel and result in entrainment of coke particles. Wet fine coke particles from the freeboard region enter the cyclone and contribute to the fouling of the Coker cyclones which can lead to the premature shut-down of Fluid Cokers.
The primary objective of this research is to determine how bed wetness affects entrainment.
First, a new fluidized bed was ...
Catalytic Co2 Hydrogenation - Literature Review: Technology Development Since 2014,
2016
University of Wyoming
Catalytic Co2 Hydrogenation - Literature Review: Technology Development Since 2014, Drayson Bratt
Chemical Engineering Plan B
Global atmospheric carbon dioxide (CO2) concentration from fossil fuel combustion has generated much concern because of the several environmental issues associated with high levels of atmospheric CO2, a major greenhouse gas. In order to reduce the risks associated with global warming, the increase in atmospheric CO2 concentration must be prevented. CO2 capture and conversion not only mitigates the risks associated with increasing CO2 concentration in the atmosphere, but also addresses the problem of fossil fuel depletion by providing sustainable production of industrial demanded fuels and chemicals.
This literature review analyzes several of the most promising ...
Tandem Laser Ablation Synthesis In Solution-Galvanic Replacement Reaction (Lasis-Grr): A Facile Route For The Synthesis Of Complex Intermetallic Nanomaterials With Engineered Functionalities,
2016
The University of Tennessee, Knoxville
Tandem Laser Ablation Synthesis In Solution-Galvanic Replacement Reaction (Lasis-Grr): A Facile Route For The Synthesis Of Complex Intermetallic Nanomaterials With Engineered Functionalities, Sheng Hu
Doctoral Dissertations
Tailoring the heteronanostructures of nanoscale materials to tune their structure-property relations for desirable interfacial energetics is imperative for their catalytic, optoelectronic and electrochemical applications. Current PhD thesis develops a facile, yet “green” synthesis route that uses laser ablation synthesis in solution in tandem with galvanic replacement reaction (tandem LASiS-GRR) as a one-pot, one-step technique for manufacturing diverse and complex heteronanostructures of metal oxides, hydroxides, nanocomposites (NCs), and nanoalloys (NAs). The scientific concept here is that the non-equilibrium thermodynamics and kinetics of high-energy LASiS-GRR can be tuned by laser parameters and solvent chemistry to form complex NCs/NAs of tailored sizes ...
Visible Light Driven Photocatalysis For Degradation Of Diclofenac,
2016
The University of Western Ontario
Visible Light Driven Photocatalysis For Degradation Of Diclofenac, Noshin Hashim
Electronic Thesis and Dissertation Repository
Diclofenac (DCF), a widely used non-steroidal anti-inflammatory drug (NSAID), is a commonly detected substance that readily accumulates in tissues of aquatic fish and poses a threat to wildlife and freshwater quality. Advanced Oxidation Processes (AOPs) have been explored as an alternative method for complete mineralization of DCF as conventional treatment methods are inadequate for treatment of trace contaminants.
This study employs a semi-batch, swirl-flow, monolithic type photocatalytic reactor to determine intrinsic kinetic parameters of DCF mineralization, in an immobilized system under both UV and visible radiation. The goal of this work to determine true kinetics of DCF, after correcting for ...
Synthesis Of Ptcuco Ternary Alloy Using Laser Ablation Synthesis In Solution-Galvanic Replacement Reaction (Lasis-Grr),
2016
University of Tennessee, Knoxville
Synthesis Of Ptcuco Ternary Alloy Using Laser Ablation Synthesis In Solution-Galvanic Replacement Reaction (Lasis-Grr), Kangmin Cheng
EURēCA: Exhibition of Undergraduate Research and Creative Achievement
Laser ablation synthesis in solution in tandem with galvanic replacement reaction (LASiS-GRR) is a newly-developed, facile and environmental friendly synthesis technique for manufacturing a variety of complex nanostructures including hydroxides, metal/metal oxides nanocomposites (NCs), metal-metal nanoalloys (NAs), core-shell nanostructures, etc. This synthetic technique incorporates both “top-down” pulsed laser ablation synthesis in solution approach (LASiS) and the “bottom-up” chemical reduction method (CRM). The setup houses a Q-switched Nd:YAG pulsed laser (1064 nm) with the laser beam focused at a metal target in liquid medium inside a sealed stainless steel reactor cell. The cell is mounted with a gas inlet ...
Enhanced Solar Photocatalytic Hydrogen Generation And Water Treatment Using Hetero-Structure Photocatalysts,
2016
The University of western ontario
Enhanced Solar Photocatalytic Hydrogen Generation And Water Treatment Using Hetero-Structure Photocatalysts, Ghodsieh Malekshoar
Electronic Thesis and Dissertation Repository
Among different approaches to overcome current environmental concerns, heterogeneous photocatalysis is recognized as a promising one. While there are various applications of photocatalysis including water splitting and water treatment, the overall efficiency of this process is still fairly low due to the two dominant drawbacks of current semiconductors, namely wide band gap and fast recombination of photo-generated charges, which restrict the photocatalytic reactions. Designing a hybrid photocatalyst composed of semiconductor hetero-junctions is a viable approach to address these challenges.
The objective of this research project is developing efficient photocatalysts via simple and practical synthesis methods in order to enhance the ...
Procesy Cieplne I Aparaty (Lab),
2016
Wroclaw University of Technology
Selective, Catalytic Decomposition Of Hydrazine,
2016
University of Akron
Selective, Catalytic Decomposition Of Hydrazine, Benjamin A. Kitson, Shirin N. Oliaee
Honors Research Projects
The selective, catalytic decomposition of hydrazine has been investigated using a 1 wt% Pt-Ni(OH)2 catalyst system quantitatively studied by changing the following parameters; reaction solution alkalinity, temperature, hydrazine concentration, catalyst selectivity, catalyst stability, and catalyst durability. Using sodium hydroxide (NaOH), the best alkalinity was found to be 1 M NaOH. The optimal temperature was found to be 50 °C for complete hydrazine conversion. A hydrazine concentration of 0.1 M produced the most effective reaction. The catalyst was found to be completely selective in hydrogen and nitrogen production with no ammonia formation. The catalyst activity decreased by 15 ...
Rational Development Of Solid Lewis Acid Catalysts For Biomass Conversion,
2016
University of Massachusetts Amherst
Rational Development Of Solid Lewis Acid Catalysts For Biomass Conversion, Chun-Chih Chang
Doctoral Dissertations May 2014 - current
The need for sustainable production of everyday materials in addition to declining reserves of petroleum-based feedstocks has motivated research into the production of renewable aromatic chemicals from biomass. We have proposed a multistep pathway to produce renewable p-xylene from lignocellulosic biomass using heterogeneous catalysts. The pathway includes formation of glucose by saccharification of cellulose, isomerization of glucose into fructose, dehydration/hydrogenolysis for production of 2,5-dimethylfuran (DMF), and final step for producing p-xylene from reacting DMF with ethylene.
Lewis acid zeolite catalysts (e.g. Sn-BEA, a tin containing molecular sieve with zeolite BEA structure) exhibited critical roles in ...
Perspectives For Low-Carbon Electricity Production Until 2030: Lessons Learned From The Comparison Of Local Contexts In Poland And Portugal,
2015
Wroclaw University of Technology
Perspectives For Low-Carbon Electricity Production Until 2030: Lessons Learned From The Comparison Of Local Contexts In Poland And Portugal, Wojciech Budzianowski, Joao Gomes
Wojciech Budzianowski
This paper compares perspectives for low-carbon electricity production in two EU member states - Poland and Portugal until 2030. Electricity production capacities, carbon emissions of electricity production, and production cost of electricity (COE) of Poland and Portugal are analyzed. The dilemmas of investments into low-carbon electricity production technologies relying on: (i) renewable energy sources (RES), (ii) nuclear fuel, and (iii) fossil fuels integrated with carbon capture and sequestration (CCS) are discussed. Roadmap 2050 recommends about 40% decarbonization of electricity generation by 2030 and 100% by 2050. Based on electricity production mix forecast for 2030 carbon emissions of electricity are estimated at ...
Inżynieria Chemiczna Lab.,
2015
Wroclaw University of Technology
Order Form Resrb 2017,
2015
Wroclaw University of Technology
Order Form Resrb 2017, Wojciech M. Budzianowski
Wojciech Budzianowski
No abstract provided.
