2 edition of investigation of hydrocarbon absorption modeled by molecular structure found in the catalog.
investigation of hydrocarbon absorption modeled by molecular structure
Anne Marie Slinn
Written in English
|Statement||by Anne Marie Slinn.|
|The Physical Object|
|Pagination||viii, 91 leaves, bound :|
|Number of Pages||91|
The absorption and emission spectra of benzo[g,h,i]perylene, a six ring polycyclic aromatic hydrocarbon molecule (C22H12), embedded in a rare gas matrix are reported. The presence of kerogen in source rocks gives rise to a plethora of potential gas storage mechanisms. Proper estimation of the gas reserve requires knowledge of the quantities of free and adsorbed gas in rock pores and kerogen. Traditional methods of reserve estimation such as the volumetric and material balance approaches are insufficient because they do not consider both the free and.
To demonstrate the relationship between the structure of nitro-polycyclic aromatic hydrocarbons and their effect on biomembranes, we have investigated the influence of three structurally different. Bioavailability is influenced by the molecular structure and size of PAHs. LMW PAHs are removed faster by physico-chemical and biological processes due to their higher solubility, volatility and the ability of many microorganisms to use them as sole carbon sources in comparison to the HMW PAHs [ 24 ].
The proposed structure for the product that corresponded to [M – H] − = in this investigation is in agreement with the first ring cleavage steps proposed in the biotransformation of the HMW PAH benz[a]anthracene by 8,9-and/or 10,carbon position attack by strain KK22 (Kunihiro et al., ). Benzene has the molecular formula C 6 H 6; in larger aromatic compounds, a different atom replaces one or more of the H atoms. As fundamental as hydrocarbons are to organic chemistry, their properties and chemical reactions are rather mundane. Most hydrocarbons are nonpolar because of the close electronegativities of the C and H atoms.
Foreign capital in Southeast Asia
Mexican and Central American Perspectives.
The Trojan women.
Folk-tales of the coast Salish
Voyage to Cythera
To the children of light in this generation
On the magnetic influence of the solar rays
Mythology in prints
Perro del hortelano
XVIIth International Congress on Herpes Virus of Man and Animal: Standardization of Immunological Procedures
Much ado about nothing (Oliver)
SUBJECT: APPORTIONMENT UNDER THE CONTINUING RESOLUTION FOR FISCAL YEAR 1998... BULLETIN NO. 98-01... EXECUTIVE OFFICE OF THE PRESIDENT... OCT.
Cancer chemotherapy for the veterinary health team
Selected Writings and Speeches
The aryl hydrocarbon receptor (AhR) is a ligand-dependent transcription factor that senses environmental exogenous and endogenous ligands or xenobiotic chemicals. In particular, exposure of the liver to environmental metabolism-disrupting chemicals contributes to the development and propagation of steatosis and hepatotoxicity.
However, the mechanisms for AhR-induced hepatotoxicity and tumor. In order to further investigate the effect of imidazolium and phosphonium-based ILs on aromatic hydrocarbons absorption, several ILs are designed to conduct the quantum chemical calculation with toluene as a model compound in this work.
The absorption of toluene by the ILs is calculated at GGA/PW91 : Liang Tan, Jiamei Zhu, Min Zhou, Xiaodong He, Shuangquan Zhang. Thus zeolite pore size and chemical characteristics play a big role in determining which hydrocarbon species get trapped. Retention—Zeolite pore structure holds hydrocarbon molecules while precious metal catalyst (Pt/Pd, TWC) layer in washcoat warms up to activation temperature by the heat supplied from the exhaust by: The two-photon absorption cross-section spectra of perylene derivatives obtained via Z-scan technique were fitted by means of a sum-over-states (SOS) model, which described with accuracy the different regions of the 2PA cross-section spectra.
Frontier molecular orbital calculations show that all molecules present similar features, indicating Cited by: Many hydrocarbons occur in nature. In addition to making up fossil fuels, they are present in trees and plants, as, for example, in the form of pigments called carotenes that occur in carrots and green leaves.
More than 98 percent of natural crude rubber is a hydrocarbon polymer, a chainlike molecule consisting of many units linked together. The structures and chemistry of individual.
This paper presents the effects of molecular structure on the catalytic behavior of bio-oil components in the steam-re-forming reactions. Methanol, ethanol, 1-propanol, butanol, 2-propanol, 1,2-propanediol, glycerol, propionaldehyde, acetone, and propionic acid were used as model compounds.
Steam re-forming of the alcohols with a long carbon chain was relatively difficult and yielded large. The chemical structure of essential oils affects their mode of action concerning their antibacterial activity. The importance of the presence of hydroxyl group in the phenolic compounds, such as carvacrol and thymol, was confirmed [22,28,30].
However, the relative position of the phenolic hydroxyl group on the ring does not appear to influence. Hydrocarbon - Hydrocarbon - Physical properties: The physical properties of alkenes and alkynes are generally similar to those of alkanes or cycloalkanes with equal numbers of carbon atoms.
Alkynes have higher boiling points than alkanes or alkenes, because the electric field of an alkyne, with its increased number of weakly held π electrons, is more easily distorted, producing stronger.
Intramolecular photocyclization of stilbene derivatives (Mallory reaction) is one of the efficient methods for building polycyclic aromatic hydrocarbon (PAH) frameworks, and is also expected to be applicable to synthesis of fluorine-containing PAHs (F-PAHs).
In this study, dibenzoanthracene-type (4a) and benzoperylene-type (4b) F-PAHs were synthesized using the Mallory reaction of the 1,4.
Effects of chemical substitution on the electronic spectra of aromatic compounds. Journal of Molecular Spectroscopy15 (2), DOI: /(65)X. Hamilton. THE EFFECT OF MOLECULAR SHAPE ON THE FLUORESCENT PROPERTIES OF 9, DIPHENYLANTHRACENE.
The effect of the hydrocarbon molecular composition of the solvent on the absorption and fluorescence spectra of n-paraffin solutions of perylene. Khudyakova & G. Sheremet'ev Journal of Applied Spectroscopy vol pages 81 – 83 ()Cite this article. Hydrocarbon - Hydrocarbon - Structure and bonding: In the German chemist August Kekule von Stradonitz suggested the cyclic structure for benzene shown above.
Kekule’s structure, while consistent with the molecular formula and the fact that all of the hydrogen atoms of benzene are equivalent, needed to be modified to accommodate the observation that disubstitution of the ring at adjacent.
Chemical forms of sulfur in geological and archeological asphaltenes from Middle East, France, and Spain determined by sulfur K- and L-edge X-ray absorption near-edge structure spectroscopy. Geochimica et Cosmochimica Acta63 (22), DOI: /S(99) Notice that the carbon atoms in the structural models (the ball-and-stick and space-filling models) of the pentane molecule do not lie in a straight line.
Because of the sp 3 hybridization, the bond angles in carbon chains are close to °, giving such chains in an alkane a zigzag shape.
In this work, we apply in situ X-ray absorption spectroscopy, X-ray diffraction and infrared spectroscopy to follow the evolution of the bulk and surface structure of an industrial catalysts consisting of nm supported palladium nanoparticles upon exposure to ethylene under atmospheric pressure at 50 °C.
Experimental results were. Molecular modeling was used to analyze the phenomena involved in the sorption of hydrocarbons by the Pt/Al2O3 reforming catalyst. The interactions between the atoms of the catalyst structure and.
Based on the flux values and retardation ratios (RR), a penetration retardation effect on percutaneous absorption of MTZ was observed for the formulations containing 1,2-diols having six- to seven-carbon chain in the presence of 1,4-cyclohexanediol (1,2-hexanediol with chain length of six hydrocarbons, RRs are and in the concentration.
In recent years, the share of unconventional hydrocarbon resources from shale deposits in the structure of world oil production has been increasing [1,2,3].Low-permeable organic-rich Bazhen formations of West Siberia and Domanic deposits of Volga–Ural petroleum province correspond to such resources in Russia [4,5].Domanic organic-rich shales are oil-generating source rocks .
This chapter summarizes the state of knowledge about the chemistry and toxicology of cigarette smoke and provides data relevant to the evaluations and conclusions presented in the disease-specific chapters of this report. The literature reviewed in this chapter is limited to manufactured cigarettes and does not include publications on handmade (“roll your own”) cigarettes or other products.
Even larger hydrocarbons, like h entriacontane (C 31 H 64), are solids at room temperature and have a soft, waxy consistency. Hydrocarbons are rather unreactive, but they do participate in some classic chemical reactions.
One common reaction is substitution with a halogen atom by combining a hydrocarbon with an elemental halogen. In order to refine the model for ISM hydrocarbon grains, we analyze the observed aromatic (, μm) and aliphatic ( μm) hydrocarbon absorption features in the diffuse ISM along the line.J.
Phys. Chem. All Publications/Website. OR SEARCH CITATIONS.an alternative model of the relationship between the carcinogenic activity of polycyclic aromatic hydrocarbons and their molecular structure August DOI: /