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 45 for “"ethylbenzene"”.
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Electro-oxidative dehydrogenation of ethylbenzene
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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Catalytic conversion of Ethylbenzene over acid zeolites
In this study, the performance of this test reaction was employed to compare the acidity of various zeolites, viz. lanthanum/sodium-exchanged zeolite Y (LaNaY-72), hygrogen/sodium-exchanged zeolote Y (LZY-52, LZY-62, LZY-82), hydrogen-exchanged zeolite Beta (H-BEA-15, H-BEA-25) and …
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The effects of pH on the biodegradation of benzene, toluene, ethylbenzene, m-Xylene in soils
… pH on the biodegradation of benzene, toluene, ethylbenzene, and m-xylene in subsurface soils. The biodegradation potential of both denitrifying and aerobic respiring microorganisms were assessed. Uncontaminated soil from five different soil depths was utilized. The pH of each soil was adjusted, …
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DEVELOPMENT OF STANDARD OPERATING PROCEDURE WITH MODIFIED METHOD TO QUANTIFY BENZENE AND OTHER VOLATILE ORGANIC COMPOUNDS IN AIR SAMPLES USING GAS CHROMATOGRAPHY
… compounds (VOCs) such as benzene, toluene, ethylbenzene, and xylenes (BTEX). The goal of this project was to develop a standard operating procedure (SOP) and modify the current method for the detection of VOCs associated with oil and gas drilling activity to accommodate the equipment and …
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Conversion of n-pentenes over H-ZSM-5
… for petrol. Benzene, toluene, xylenes and ethylbenzene (BTX+EB) are good or even better octane boosters, although the use of benzene is limited due to its carcinogenic nature. From an industrial point of view, these compounds are therefore of importance. The conversion of I-pentene over …
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Novel mesoporous silicates as indoor air pollutant scavengers
… of interest were formaldehyde, toluene, ethylbenzene, o-xylene, cumene and dichlorobenzene. The indoor air pollutants were actively sampled onto (i) Tenax filled sampling tubes and subsequently analysed by thermal desorption gas chromatography mass spectrometry or (ii) chemically modified …
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Evaluation of gasoline-denatured ethanol as a carbon source for wastewater denitrification
… the octane rating, such as benzene, toluene, ethylbenzene and xylenes (BTEX). Herein are presented the results of using dEtOH, EtOH (95.5% ethanol-4.5% water) and MeOH for denitrification in lab-scale, sequencing batch reactors (SBRs). We also focused on the quantification of BTEX present in …
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Permanganate oxidations of aromatic hydrocarbons in aqueous and organic solution
… In water at pH 7, the reactions of toluene, ethylbenzene, and cumene with KMnO$\sb4$ were studied. In toluene, $\rm\sp{n}Bu\sb4NMnO\sb4$ was used as the oxidant in the reactions of toluene, ethylbenzene, cumene, diphenylmethane, triphenylmethane, fluorene, 9,10-dihydroanthracene, and …
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Assessing the Spatial and Temporal Distribution of MTBE and BTEX Compounds in Lake Lewisville, Texas February 1999 - February 2000
… Ether (MTBE) and BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) compounds were assessed in a multipurpose reservoir, Lake Lewisville, Texas between February 1999 and February 2000. Concentrations of MTBE ranged from 0.0 - 16.7 mg/L. Levels of MTBE in the lake were related to watercraft. …
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Observations of Aromatic Oxidation Products in Southeast Asia
… of C₈-PAN, attributed to the oxidation of ethylbenzene and xylene isomers, indicating the importance of aromatic The prediction of PBzN applying campaign measurements while holding the benzyl radical and PBzN in steady state was performed. The R² values indicate stronger correlations in …
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Zebra GC: A Fully Integrated Micro Gas Chromatography System
… toluene, tetrachloroethylene, chlorobenzene, ethylbenzene, and p-xylene. Limit of Detection (LOD) of ~1 ng was achieved, which corresponds to 10 min sampling time at a flow rate of 1 mL/min for analyte present at ~25 ppbv concentration. An innovative method for generating very sharp injection …
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Effects of soil moisture, soil carbonate and organic matter content on vapor phase sorption of volatile organic compounds using inverse gas chromatography
… 1,1,1-trichloroethane (TCA); benzene; toluene; ethylbenzene; chlorobenzene; heptane; and pentane. Inverse Gas Chromatography (IGC) was the primary method used to measure VOC sorption in these experiments. Sorption for all the evaluated VOCs decreased with increasing moisture. Non-reversibility …
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Benchtop testing of polyethylene passive sampling towards a quantitative analysis of volatile organic compounds (VOCs) in soil vapours
… in the water. With benzene, toluene, ethylbenzene and o-xylene (BTEX) selected to be quantified in the actual soil, both the PE passive sampler and the water-based measurement showed inconsistency in contrast to previous experiments with glass beads and sand. This inconsistency could …
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A Fast-Response Odor Chromatographic Sniffer (FOX)
… was evaluated and validated for benzene toluene, ethylbenzene, and xylene (BTEX). This research highlights the versatility of μGCs in applications ranging from environmental monitoring to quality control in the fuel industry, showcasing their potential as powerful tools for on-site chemical …
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Potential for City Parks to Reduce Exposure to Hazardous Air Pollutants
Benzene, toluene, ethylbenzene, and xylenes (BTEX) are hazardous air pollutants commonly found in outdoor air. Several studies have explored the potential of vegetation to mitigate BTEX in outdoor air, but they are limited to a northern temperate climate and present conflicting results. To …
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Mass transfer from non-aqueous phase liquids to the aqueous phase in groundwater systems
… the aqueous mass transfer of benzene, toluene, ethylbenzene, and xylene from and inert compound (soltrol or hexadecane). The results of this research indicate that the rate of NAPL-aqueous interphase mass transfer increases as a function of increasing aqueous phase velocity and percent NAPL …
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Photolysis Kinetics of Aromatic Pollutants in Liquid and Solid Environmental Condensed Phases
… constants of the aromatic pollutants toluene, ethylbenzene, xylenes (TEX) and anthracene under environmentally-relevant conditions in order to improve fate predictions. The photolysis kinetics of TEX in water, ice and at ice surfaces were investigated using environmentally-relevant wavelengths. …
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Avaliação preliminar da contaminação por BTEX, em água subterrânea de poços tubulares, no município de Natal-RN
… volatile hydrocarbons (BTEX - benzene, toluene, ethylbenzene and xylenes), so this work aimed to assess the quality of groundwater wells that supply funding for public supply and trade in the urban area of the city of Natal, in Rio Grande do Norte, contributing to the environmental assessment of …
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Characterization of redox conditions in a petroleum contaminated aquifer: Implications for bioremediation potential
… TEAPs during biodegradation of benzene, toluene, ethylbenzene, and the xylenes (BTEX); 2) examine the biodegradation potential in different portions of the plume; and 3) compare methods of TEAP characterization. In general, the presence of Fe-oxides in microcosms inhibited methanogenesis. Although …
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