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Literatura académica sobre el tema "Desorption energy"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Desorption energy"

Zhang, Binbin, Jiacheng Peng, Ye Li, Huancong Shi, Jing Jin, Jiawei Hu y Shijian Lu. "Evaluating CO2 Desorption Activity of Tri-Solvent MEA + EAE + AMP with Various Commercial Solid Acid Catalysts". Catalysts 12, n.º 7 (30 de junio de 2022): 723. http://dx.doi.org/10.3390/catal12070723.

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The Paris Agreement and one of its goals, “carbon neutrality,” require intensive studies on CO2 absorption and desorption processes. When searching for ways of reducing the huge energy cost of CO2 desorption in the amine scrubbing process, the combination of blended amine with solid acid catalysts turned out to be a powerful solution in need of further investigation. In this study, the tri-solvent MEA (monoethanolamine) + EAE(2-(ethylamino)ethanol) + AMP(2-amino-2-methyl-1-propanol) was prepared at: 0.2 + 2 + 2, 0.5 + 2 + 2, 0.3 + 1.5 + 2.5 and 0.2 + 1 + 3 mol/L. The heterogeneous catalytic CO2 desorptions were tested with five commercial catalysts: blended γ-Al2O3/H-ZSM-5, H-beta, H-mordenite, HND-8 and HND-580. Desorption experiments were conducted via a recirculation process with direct heating at 363 K or using temperature programming method having a range of 303–363 K. Then, the average CO2 desorption rate, heat duty and desorption factors were studied. After comparison, the order of CO2 desorption performance was found to be HND-8 > HND-580 > H-mordenite > Hβ > blended γ-Al2O3/H-ZSM-5 > no catalyst. Among the other combinations, the 0.2 + 1 + 3 mol/L MEA + EAE + AMP with HND-8 had a minimized heat duty (HD) of 589.3 kJ/mol CO2 and the biggest desorption factor (DF) of 0.0277 * (10−3 mol CO2)3/L2 kJ min. This study provided a kind of tri-solvent with catalysts as an energy-efficient solution for CO2 absorption and desorption in industrial CO2 capture pilot plants.

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van der Ham, L. V., P. Khakharia y E. L. V. Goetheer. "Heat-Integrated Liquid–Desorption Exchanger (HILDE) for CO2 Desorption". Energy Procedia 86 (enero de 2016): 106–15. http://dx.doi.org/10.1016/j.egypro.2016.01.011.

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Wei, Fu Gao, Kaneaki Tsuzaki y Toru Hara. "A New Method to Determine the Activation Energy for Hydrogen Desorption from Steels". Materials Science Forum 475-479 (enero de 2005): 229–32. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.229.

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A new method has been developed to determine the activation energy for hydrogen desorption from steels by means of thermal desorption spectrometry (TDS). This method directly fits the Kissinger’s reaction kinetic formula dX/dt=A(1-X)exp(-Ed/RT) to experimentally measured thermal desorption spectrum and best fit yields the activation energy (Ed) and the value of constant A. It has been proven that this new method is applicable to precise measurement of the activation energy for hydrogen desorption from incoherent TiC particle, coherent TiC precipitate, grain boundary and dislocation in 0.05C-0.20Ti-2.0Ni and 0.42C-0.30Ti steels.

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Kuznetsov Yu. A. y Lapushkin M.N. "Energy Characteristics of Electron-Stimulated Desorption of Lithium Atoms from Lithium Layers on the Li-=SUB=-x-=/SUB=-Au-=SUB=-y-=/SUB=- Surface". Physics of the Solid State 64, n.º 6 (2022): 733. http://dx.doi.org/10.21883/pss.2022.06.53840.287.

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The formation of 2D LixAuy semiconductor layers on the surface of gold deposited on a tungsten substrate has been studied. The processes of electron-stimulated desorption of Li atoms in the Li/LixAuy/Au/W system are considered. The presence of two peaks in the kinetic energy distribution of desorbed lithium atoms is shown: a high energy peak at an energy of 0.3 eV and a low energy peak at an energy of 0.11 eV. The high energy peak is associated with the desorption of lithium atoms from the adsorbed lithium layers, and the low energy peak is associated with the LixAuy intermetallic compound. The influence of the number of deposited gold and lithium atoms on the process of formation of 2D semiconductor LixAuy layers is studied. It is shown that the processes of electron-stimulated desorption occur in the Li monolayer and the LixAuy layer closest to it. A model of electron-stimulated desorption of Li atoms in the Li/LixAuy/Au/W system is proposed. Keywords: electron-stimulated desorption, lithium, gold, semiconductor, intermetallic compound.

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Furuya, Kenji, Yasuhiro Oba y Takashi Shimonishi. "Quantifying the Chemical Desorption of H₂S and PH₃ from Amorphous Water-ice Surfaces". Astrophysical Journal 926, n.º 2 (1 de febrero de 2022): 171. http://dx.doi.org/10.3847/1538-4357/ac4260.

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Abstract Nonthermal desorption of molecules from icy grain surfaces is required to explain molecular line observations in the cold gas of star-forming regions. Chemical desorption is one of the nonthermal desorption processes and is driven by the energy released by chemical reactions. After an exothermic surface reaction, the excess energy is transferred to products’ translational energy in the direction perpendicular to the surface, leading to desorption. The desorption probability of product species, especially that of product species from water-ice surfaces, is not well understood. This uncertainty limits our understanding of the interplay between gas-phase and ice-surface chemistry. In the present work, we constrain the desorption probability of H2S and PH3 per reaction event on porous amorphous solid water (ASW) by numerically simulating previous laboratory experiments. Adopting the microscopic kinetic Monte Carlo method, we find that the desorption probabilities of H2S and PH3 from porous ASW per hydrogen-addition event of the precursor species are 3% ± 1.5% and 4% ± 2%, respectively. These probabilities are consistent with a theoretical model of chemical desorption proposed in the literature if ∼7% of energy released by the reactions is transferred to the translational excitation of the products. As a byproduct, we find that approximately 70% (40%) of adsorption sites for atomic H on porous ASW should have a binding energy lower than ∼300 K (∼200 K). The astrochemical implications of our findings are briefly discussed.

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He, Jiao y Gianfranco Vidali. "Application of a diffusion–desorption rate equation model in astrochemistry". Faraday Discuss. 168 (2014): 517–32. http://dx.doi.org/10.1039/c3fd00113j.

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Desorption and diffusion are two of the most important processes on interstellar grain surfaces; knowledge of them is critical for the understanding of chemical reaction networks in the interstellar medium (ISM). However, a lack of information on desorption and diffusion is preventing further progress in astrochemistry. To obtain desorption energy distributions of molecules from the surfaces of ISM-related materials, one usually carries out adsorption–desorption temperature programmed desorption (TPD) experiments, and uses rate equation models to extract desorption energy distributions. However, the often-used rate equation models fail to adequately take into account diffusion processes and thus are only valid in situations where adsorption is strongly localized. As adsorption–desorption experiments show that adsorbate molecules tend to occupy deep adsorption sites before occupying shallow ones, a diffusion process must be involved. Thus, it is necessary to include a diffusion term in the model that takes into account the morphology of the surface as obtained from analyses of TPD experiments. We take the experimental data of CO desorption from the MgO(100) surface and of D₂ desorption from amorphous solid water ice as examples to show how a diffusion–desorption rate equation model explains the redistribution of adsorbate molecules among different adsorption sites. We extract distributions of desorption energies and diffusion energy barriers from TPD profiles. These examples are contrasted with a system where adsorption is strongly localized – HD from an amorphous silicate surface. Suggestions for experimental investigations are provided.

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Yang, Qian Ming y Yong Guo Luo. "Performance Analysis of CO₂ Capture System by MEA Method Based on Solar Assisted Heat Pump Technology". Advanced Materials Research 236-238 (mayo de 2011): 518–22. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.518.

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The MEA method basic process and CO2 capture system by the MEA method based on the lean solution source heat pump technology have been introduced. The desorption energy consumption of the system has been analyzed and caculated. The results show that heat pump technology combined with MEA method can reduce desorption energy consumption of system substantially. A new type of CO2 capture system by the MEA method with the solar-lean solution compound source heat pump providing desorption heat is put forward，whose thermodynamic performance is analyzed and the result indicates that desorption energy consumption can be decreased further by applying the solar assisted heat pump technology in the MEA method.

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Elkhatib, E. A., A. M. Mahdy y N. H. Barakat. "Thermodynamics of copper desorption from soils as affected by citrate and succinate". Soil and Water Research 2, No. 4 (7 de enero de 2008): 135–40. http://dx.doi.org/10.17221/2110-swr.

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Desorption of Cu and low molecular weight dissolved organics are the primary factors that impact fate and transport of Cu in soils. To improve predictions of the toxicity and threat from Cu contaminated soil, it is critical that time-dependent desorption behaviour be understood. In this paper, the effect of organic ligands citrate and succinate on the kinetics of Cu desorption from contaminated soils varying widely in soil characteristics was investigated at three different temperatures. The results showed that the first order equation adequately described the kinetics of Cu desorption from clay and sandy soils under isothermal conditions. The reaction rate constant (k<sub>d</sub>) values of the first order kinetic equation for Cu desorption increased consistently with temperature, indicating faster release of Cu at higher temperatures. The Cu desorption rate from the studied soils at all three temperatures was as follows: citric > succinic. The E<sub>a</sub>values indicates that Cu desorption from the studied soils in the presence of two organic ligands is a diffusion controlled reaction. The negative values of ΔH* suggest that the desorption reactions are not energy consuming process. The higher negative values of (ΔH*) for Cu desorption from the studied soils in the presence of succinic ligand indicate that the heat energy required to overcome the Cu desorption barrier was greater than that for Cu desorption in the presence of citric ligand. Computation of the free energy of activation (ΔG*) yielded values ranging for 87 to 87.9 kJ/mol. The largest value represents ΔG* for Cu desorption for clay soil in the presence of succinic acid while the lowest value represents ΔG* for Cu desorption for sandy soil in the presence of citric acid. The information in this study is quite necessary to construct full functioning models that will help scientists to better understand mobility and bioavailability of metals in soils.

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Кузнецов, Ю. А. y М. Н. Лапушкин. "Энергетические характеристики электронно-стимулированной десорбции атомов лития из слоев лития на поверхности Li-=SUB=-x-=/SUB=-Au-=SUB=-y-=/SUB=-". Физика твердого тела 64, n.º 6 (2022): 732. http://dx.doi.org/10.21883/ftt.2022.06.52401.287.

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Chen, Xuexi, Liang Zhang y Maoliang Shen. "Experimental research on desorption characteristics of gas-bearing coal subjected to mechanical vibration". Energy Exploration & Exploitation 38, n.º 5 (31 de agosto de 2020): 1454–66. http://dx.doi.org/10.1177/0144598720956286.

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Mechanical vibration can induce coal and gas outburst accidents, and can also promote the exploitation of coalbed methane. In this paper, a vibration-adsorption-desorption experiment system was established, the effects of coal sample particle diameter, gas pressure, and vibration frequency on gas desorption were studied. Mechanical vibration can generate a shear force in the adsorbed gas and promote gas desorption, but there are appropriate vibration parameters. Within the range of experimental parameters, the larger the amplitude, the more favorable for gas desorption. The change rules of gas desorption rate and desorption quantity under different conditions are basically the same, showing a power function shape with time increase, and most of the desorption quantity was completed within the first 5 minutes. The gas desorption rate and desorption quantity were positively related to the gas adsorption pressure. The results have great reference value for preventing gas outbursts and promoting gas exploitation.

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Tesis sobre el tema "Desorption energy"

Acharya, Ananta R. "Indium Nitride Surface Structure, Desorption Kinetics and Thermal Stability". Digital Archive @ GSU, 2013. http://digitalarchive.gsu.edu/phy_astr_diss/62.

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Unique physical properties such as small effective mass, high electron drift velocities, high electron mobility and small band gap energy make InN a candidate for applications in high-speed microelectronic and optoelectronic devices. The aim of this research is to understand the surface properties, desorption kinetics and thermal stability of InN epilayers that affect the growth processes and determine film quality as well as device performance and life time. We have investigated the structural properties, the surface desorption kinetics, and the thermal stability using Auger electron spectroscopy (AES), x-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), high resolution electron energy loss spectroscopy (HREELS), and temperature programmed desorption (TPD). Investigations on high pressure chemical vapor deposition (HPCVD)-grown InN samples revealed the presence of tilted crystallites, which were attributed to high group V/III flux ratio and lattice mismatch. A study of the thermal stability of HPCVD-grown InN epilayers revealed that the activation energy for nitrogen desorption was 1.6±0.2 eV, independent of the group V/III flux ratio. Initial investigations on the ternary alloy In0.96Ga0.04N showed single-phase, N-polar epilayers using XRD and HREELS, while a thermal desorption study revealed an activation energy for nitrogen desorption of 1.14 ± 0.06 eV. HREELS investigations of atomic layer epitaxy (ALE)-grown InN revealed vibrational modes assigned to N-N vibrations. The atomic hydrogen cleaned InN surface also exhibited modes assigned to surface N-H without showing In-H species, which indicated N-polar InN. Complete desorption of hydrogen from the InN surface was best described by the first-order desorption kinetics with an activation energy of 0.88 ± 0.06 eV and pre-exponential factor of (1.5 ± 0.5) ×105 s-1. Overall, we have used a number of techniques to characterize the structure, surface bonding configuration, thermal stability and hydrogen desorption kinetics of InN and In0.96Ga0.04N epilayers grown by HPCVD and ALE. High group V/III precursors ratio and lattice mismatch have a crucial influence on the film orientation. The effects of hydrogen on the decomposition add to the wide variation in the activation energy of nitrogen desorption. Presence of surface defects lowers the activation energy for hydrogen desorption from the surface.

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Xiong, Fengyang. "Desorption and Adsorption of Subsurface Shale Gas". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1591975402482308.

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Greenwood, Claire-Louise. "Energy and angular distributions of ions induced by electron stimulated desorption from surfaces". Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240517.

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Zhang, Yunfeng. "The adsorption and desorption of allylamine on the Si(100) surface". abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1456419.

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Hedlund, Emma. "Studies of Heavy Ion Induced Desorption in the Energy Range 5-100 MeV/u". Doctoral thesis, Uppsala University, Division of Nuclear and Particle Physics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8654.

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During operation of heavy ion accelerators a significant pressure rise has been observed when the intensity of the high energy beam was increased. The cause for this pressure rise is ion induced desorption, which is the result when beam ions collide with residual gas molecules in the accelerator, whereby they undergo charge exchange. Since the change in charge state will affect the bending radius of the particles after they have passed a bending magnet, they will not follow the required trajectory but instead collide with the vacuum chamber wall and gas are released. For the Future GSI project FAIR (Facility for Antiproton and Ion Research) there is a need to upgrade the SIS18 synchrotron in order to meet the requirements of the increased intensity. The aim of this work was to measure the desorption yields, η, (released molecules per incident ion) from materials commonly used in accelerators: 316LN stainless steel, Cu, Etched Cu, gold coated Cu, Ta and TiZrV coated stainless steel with argon and uranium beams at the energies 5-100 MeV/u. The measurements were performed at GSI and at The Svedberg Laboratory where a new dedicated teststand was built. It was found that the desorption yield scales with the electronic energy loss to the second power, decreasing for increasing impact energy above the Bragg Maximum. A feasibility study on the possibility to use laser refractometry to improve the accuracy of a specific throughput system was performed. The result was an improvement by up to 3 orders of magnitude, depending on pressure range.

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Poston, Michael Joseph. "Thermal and non-thermal processes involving water on Apollo lunar samples and metal oxide powders". Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52223.

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Water is of interest for understanding the formation history and habitability of past and present solar system environments. It also has potential as a resource - when split to its constituent oxygen and hydrogen - both in space and on the Earth. Determining the sources, evolution, and eventual fate of water on bodies easily reachable from Earth, especially Earth's moon, is thus of high scientific and exploration value to the private sector and government space agencies. Understanding how to efficiently split water with solar energy has potential to launch a hydrogen economy here on Earth and to power spacecraft more sustainably to far away destinations. To address the fundamental interactions of water with important surfaces relevant to space exploration and technology development, temperature programmed desorption (TPD) and water photolysis experiments under well controlled adsorbate coverages have been carried out and are described in detail in this thesis. TPD experiments under ultra-high vacuum (UHV) conditions were conducted on lunar surrogate materials and genuine lunar samples brought to Earth by the Apollo program. The TPD's were conducted to determine the desorption activation energies of water chemisorbed directly to the powder surfaces, knowledge of which can improve existing models of water evolution on Earth's moon and aid in interpreting data collected by spacecraft-based investigations at the Moon. The TPD experiments of molecular water interacting with two lunar surrogates (micronized JSC-1A and albite) in ultra-high vacuum revealed water desorption during initial heating to 750 K under ultra-high vacuum. Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) indicated possible water formation during the initial heating via recombinative desorption of native hydroxyls above 425 ± 25K. Dissociative chemisorption of water (i.e., formation of surface hydroxyl sites) was not observed on laboratory time scales after controlled dosing of samples (initially heated above 750 K) with 0.2 - 500 L exposures of water. However, pre-heated samples of both types of surrogates were found to have a distribution of molecular water chemisorption sites, with albite having at least twice as many as the JSC-1A samples by mass. A fit to the TPD data yields a distribution function of desorption activation energies ranging from ~0.45 eV to 1.2 eV. Using the fitted distribution function as an initial condition, the TPD process was simulated on the timescale of a lunation. A preview of these results and their context was published in Icarus (2011) 213, 64, doi: 10.1016/j.icarus.2011.02.015 by lead author Charles Hibbitts and the full treatment of the results from the TPD on lunar surrogates (presented here in Chapter 2) has been published in the Journal of Geophysical Research – Planets (2013) 118, 105, doi: 10.1002/jgre.20025 by lead author Michael J Poston. The desorption activation energies for water molecules chemisorbed to Apollo lunar samples 72501 and 12001 were determined by temperature programmed desorption (TPD) experiments in ultra-high vacuum. A significant difference in both the energies and abundance of chemisorption sites was observed, with 72501 retaining up to 40 times more water (by mass) and with much stronger interactions, possibly approaching 1.5 eV. The dramatic difference between the samples may be due to differences in mineralogy, surface exposure age, and contamination of sample 12001 with oxygen and water vapor before it arrived at the lunar sample storage facility. The distribution function of water desorption activation energies for sample 72501 was used as an initial condition to mathematically simulate a TPD experiment with the temperature program matching the lunar day. The full treatment of the TPD results from these two lunar samples (presented here in Chapter 3) has been submitted with the title "Water chemisorption interactions with Apollo lunar samples 72501 and 12001 by ultra-high vacuum temperature programmed desorption experiments" to Icarus for publication in the special issue on lunar volatiles by lead author Michael J Poston. A new ultra-high vacuum system (described in Chapter 4) was designed and constructed for planned experiments examining the possible formation of hydrated species, including water, from interaction of solar wind hydrogen with oxygen in the lunar regolith and to examine the effects of the active radiation environment on water adsorption and desorption behavior on lunar materials. This system has been designed in close collaboration with Dr. Chris J Bennett. An examination of a unique system for water photolysis - zirconia nanoparticles for hydrogen production from water with ultra-violet photons - was performed to better understand the mechanism and efficiency of water splitting on this catalyst. Specifically, formation of H₂ from photolysis of water adsorbed on zirconia (ZrO₂) nanoparticles using 254 nm (4.9 eV) and 185 nm (6.7 eV) photon irradiation was examined. The H₂ yield was approximately an order of magnitude higher using monoclinic versus cubic phase nanoparticles. For monoclinic particles containing 2 monolayers (ML) of water, the maximum H₂ production rate was ~0.4 µmole hr⁻¹ m⁻² using 185 + 254 nm excitation and a factor of 10 lower using only 254 nm. UV reflectance reveals that monoclinic nanoparticles contain fewer defects than cubic nanoparticles. A H₂O coverage dependence study of the H₂ yield is best fit by a sum of interactions involving at least two types of adsorbate-surface complexes. The first dominates up to ~0.06 ML and is attributed to H₂O chemisorbed at surface defect sites. The second dominates at coverages up to a bilayer. H₂ formation is maximum within this bilayer and likely results from efficient energy transfer from the particle to the interface. Energy transfer is more efficient for the monoclinic ZrO₂ nanoparticles and likely involves mobile excitons. These results (presented in Chapter 5) have been submitted with the title "UV Photon-Induced Water Decomposition on Zirconia Nanoparticles" for publication in the Journal of Physical Chemistry C by lead author Michael J Poston. This paper has been reviewed and will be accepted after minor modification.

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Yau, Pui Yip. "Thresholds for production of gaseous ions in matrix-assisted laser desorption/ionisation mass spectrometry of bio-molecules". Thesis, University of Warwick, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389459.

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Wagner, Steffen. "State- and time-resolved investigations of energy transfer mechanisms in femtosecond-laser induced associative desorption". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=983581843.

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GHAANI, MOHAMMAD REZA. "Study of new materials and their functionality for hydrogen storage and other energy applications". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/49808.

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The first part of this thesis deals with hydrogen storage materials, in view of their applications as promising energy carriers. One of the main open problems with these materials is: how can their decomposition temperature be lowered, when hydrogen is wanted to be released, so as to improve the energy efficiency of the process. A possible answer is given by joint decomposition of two or more hydrides, if very stable mixed compounds are formed (‘hydride destabilization’). Aiming at this result, the new hydride composite 2LiBH4-Mg2FeH6 was considered, it was synthesized, and its thermodynamic and kinetic properties were investigated. In the second part of this thesis work lithium oxide materials, of relevant interest for applications to batteries, were investigated. The chemical lithiation reaction of niobium oxide was considered, as equivalent to the electrochemical process of lithium insertion on discharging a Nb2O5 cathode vs. a metal Li anode. Thus, the Li2Nb2O5 compound was synthesized by reaction of monoclinic a-Nb2O5 with n-butyllithium.This material was investigated by neutron powder diffraction (D2B equipment at ILL, France) and its structure was Rietveld refined in space group P2 to wRp=0.045, locating the Li atoms inserted in the a-Nb2O5 framework.

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Lane, Christopher Don. "Low-Energy Electron Induced Processes in Molecular Thin Films Condensed on Silicon and Titanium Dioxide Surfaces". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14588.

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The focus of the presented research is to examine the fundamental physics and chemistry of low-energy electron-stimulated reactions on adsorbate covered single crystal surfaces. Specifically, condensed SiCl₄ on the Si(111) surface and condensed H₂O on the TiO₂ (110) surface have been studied. By varying adsorbate film thicknesses, the coupling strength of the target molecule to the substrate and surrounding media dictates the progression of the electron induced reactions. To investigate the electron interactions with SiCl₄ on the Si(111) surface, desorbing cations and neutrals were detected via time of flight mass spectrometry (ToF-MS) where neutral chlorine atoms were ionized using a resonance enhanced multi-photon ionization (REMPI) technique. Structure in the cation and neutral yields were assigned to molecular excitations. At an incident electron energy of 10 eV, a resonance structure in the neutral yields was attributed to a negative ion resonance and observed in thick and thin films of SiCl₄. With monoenergetic electrons, specific surface reactions can be controlled which have implications for film growth, surface patterning and masking, and etching. For the H₂O/TiO₂ (110) system, the water interactions with the TiO₂ surface are revealed through the strong electron induced reaction dependencies on the water coverage. Understanding the nonthermal reaction landscape of H₂O on the TiO₂ (110) surface is crucial for developing the system as a catalytic source of hydrogen. The electron-stimulated oxidation of the TiO₂ (110) surface and electron induced sputtering of H ₂O was investigated. Irradiation of water films ([coverage]< 3 ML) oxidized the TiO₂ (110) surface similarly as surface oxidation via O₂ deposition. Each H₂O molecule in the first monolayer seems to be a target for the incoming electron initiating the oxidation. However, water coverages greater than a monolayer limited the oxidation process. The electron-stimulated desorption and sputtering yields of water from the TiO₂ (110) surface were measured as a function of water coverage. Surprisingly, the amount of water sputtered from the surface is nonlinearly dependent on water coverage.

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Libros sobre el tema "Desorption energy"

Microwave regenerable air purification device: Final report, contract NAS2-14374. Myrtle Creek, OR: Umpqua Research Co., 1996.

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Capítulos de libros sobre el tema "Desorption energy"

Datta, Dipak Ranjan. "Coal, Desorption". En Encyclopedia of Mineral and Energy Policy, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-40871-7_105-1.

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Menges, M., B. Baumeister, K. Al-Shamery, B. Adam, Th Mull, H. J. Freund, C. Fischer, D. Weide y P. Andresen. "Low Energy Excitations and Desorption Dynamics from Oxide Surfaces". En Springer Series in Surface Sciences, 275–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78080-6_44.

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Cheng, Lin y Masato Enomoto. "Effects of Specimen Shape, Size and Initial Occupancy on the Thermal Desorption Spectrum of Hydrogen". En Energy Materials 2014, 687–92. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48765-6_83.

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Gotoh, T., S. Takagi y G. Tominaga. "Positive Ion Desorption from MgO by Low Energy Electron Irradiation". En Springer Series in Surface Sciences, 327–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84145-3_45.

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Cheng, Lin y Masato Enomoto. "Effects of Specimen Shape, Size and Initial Occupancy on the Thermal Desorption Spectrum of Hydrogen THIS CHAPTER HAS BEEN RETRACTED". En Energy Materials 2014, 687–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119027973.ch83.

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Guthier, W. "Particle Desorption from Non-Metallic Surfaces by High Energy Heavy Ions". En Springer Proceedings in Physics, 17–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82718-1_4.

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Wei, Fu Gao, Kaneaki Tsuzaki y Toru Hara. "A New Method to Determine the Activation Energy for Hydrogen Desorption from Steels". En Materials Science Forum, 229–32. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.229.

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Bernheim, M. y Ting Di Wu. "Resonant Desorption of Negative Ions from Adsorbed Layers Bombarded by Very Low Energy Electrons". En Springer Series in Surface Sciences, 208–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84145-3_27.

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Kodera, Y., N. Yamasaki, J. Miki, M. Ohyanagi, S. Shiozaki, S. Fukui, J. Yin y T. Fukui. "Sorption/Desorption Properties of MgH2 -Oxide Composite Prepared by Ultra High-Energy Planetary Ball Milling". En Ceramic Transactions Series, 31–39. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470528976.ch3.

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Muthukumar, Lakshmi y Rajesh Khare. "Molecular Dynamics Simulation of Free Energy of Desorption of Cellohexaose from a Cellulose Crystal Surface". En ACS Symposium Series, 1–17. Washington, DC: American Chemical Society, 2013. http://dx.doi.org/10.1021/bk-2013-1133.ch001.

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Actas de conferencias sobre el tema "Desorption energy"

Deepika, Kamal Raj R, T. J. Dhilip Kumar y Rakesh Kumar. "Sequential desorption energy of hydrogen from nickel clusters". En NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4917980.

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Wolf, Jeremy, Sepideh Maaref, Benjamin Tutolo y Apostolos Kantzas. "An Experimental Study of Single Component Adsorption/Desorption Isotherms". En SPE Canadian Energy Technology Conference. SPE, 2022. http://dx.doi.org/10.2118/208920-ms.

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Abstract Within tight reservoirs, gas is stored both as free gas contained in the pores and adsorbed gas on the rock matrix. Adsorbed gas exhibits liquid-like densities resulting in significantly more gas being stored on the rock surface. By having accurate adsorption/desorption data of injected and reservoir gases, one can acquire a better understanding of the true original gas in place, as well as how to maximize production through optimal enhanced gas recovery (EGR) techniques. The aim of this research is to measure the adsorption/desorption isotherms of single-component gases on activated carbon in a series of pressure steps up to 1500 psi. The experiments are conducted at varying temperatures to establish a wide array of isotherms. Temperatures are maintained through the use of a water bath. The obtained isothermal pressure data is modeled using the Gibbs sorption isotherm and the Langmuir mathematical model, the most popular and simplistic approach. Furthermore, by plotting pressure divided by adsorption capacity as a function of pressure, Langmuir parameters are determined. From the experiments, isothermal pressure data was able to be modeled using the Gibbs sorption isotherm and the Langmuir isotherm and Langmuir parameters were determined and compared. It was observed that decreasing temperature and increasing hydrocarbon molecular weight were the main contributing factors to higher sorption capacities of the single component gases. It is important to quantify both adsorption and desorption processes because in EGR techniques such as cyclic solvent injection (CSI) injected gas is competitively adsorbing onto the rock, causing the adsorbed reservoir gas to be displaced, desorb, and subsequently be produced. Due to the aforementioned irreversibilities, by using adsorption metrics to quantify the amount of gas desorbed within the reservoir, gas production may be overestimated. To date, most adsorption/desorption experimental work has been conducted on methane, carbon dioxide, and nitrogen. This research aims to expand on previous literature by performing adsorption/desorption experiments on higher chain hydrocarbons, such as ethane and propane. By doing so, CSI EGR schemes can be more meticulously modeled as the inclusion of higher chain hydrocarbons allows for the model sorption inputs to be more representative of typical unconventional reservoir gas. This in turn will allow for more accurate production forecasting, helping minimize the financial risk of costly EGR projects.

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Nakaso, Koichi, Erfina Oktariani, Atsushi Noda, Kazuya Nakashima, Keisuke Tahara, Bing Xue, Agung Tri Wijayanta y Jun Fukai. "Estimation of Performance of Absorption/Desorption System for Regenerating Waste Water From Industrial Process". En ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54875.

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More reduction in energy consumption is requested to the industrial processes. In particular, large quantity of waste water at low temperature is released from chemical and steel processes. In this study, adsorption/desorption process of zeolite and water pair were selected to generate steam from water at low temperature. Contacting water liquid and zeolite directly, adsorption heat released from zeolite makes excess water evaporate. Basic experiments for adsorption/desorption process were carried out. First of all, adsorbents with different type were tested to find the candidate of the proposed system, and then suitable adsorbent was selected. From the basic adsorption experiment, generation of steam from the water liquid was confirmed by the proposed system. In the desorption process, hot dry gas was introduced to the adsorbent. The effect of gas temperature and its flow rate was investigated. The performance of the system was theoretically investigated based on overall heat and mass balances. As a result, the ratio of enthalpy of recovered steam of 140°C to input waste water of 80°C was around 6 when adsorption process was only considered. On the other hand, the ratio was 0.57 when waste heat was utilized for the desorption process. However if waste heat such as exhaust gas can be utilized for the desorption process, the ratio, that is, the efficiency would increase.

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Jedrzejek, C. "Selective Laser-stimulated Desorption of Molecules by Internal Vibration Excitation". En Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/msba.1985.tub1.

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A model of photodesorption due to a laser resonantly coupled to an internal vibration mode of the adsorbed molecule is considered. Contrary to works of Gortel, Kreuzer and collaborators1,2 the model accounts for an anharmonicity of the internal vibration, broadening of energy levels of a zero-order Hamiltonian, and partly for multiphonon nature of the resonant heating mechanism. The importance of these features of the model was earlier demonstrated by the author and coworkers for thermal desorption3 and laser-stimulated desorption (LSD) through the excitation of the surface bond.4

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Chen, H., M. Li, Y. Zhang, C. Liu y Y. Li. "Productivity Prediction of Coalbed Methane Considering the Permeability Changes in Coal". En SPE Energy Resources Conference. SPE, 2014. http://dx.doi.org/10.2118/spe-169922-ms.

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AbstractThis paper describes a three-dimensional numerical model for predicting the coalbed methane (CBM) production. The model describes single phase gas desorption from coal matrix, diffusion to the fracture and two-phase flow of gas and water in the natural fracture system as well as the permeability changes in coal which result from effective stress changes and matrix shrinkage due to gas desorption. The model was discretized by a finite difference method. The implicit pressure-explicit saturation (IMPES) method was used to solve the two-phase flow equations and gas desorption equation was solved implicitly.The numerical model was validated by the field data from Qinshui basin in China. Based on the model, the impact of various reservoir and Langmuir isothermal adsorption parameters on the gas production was investigated.The results show that the gas production rate of the coalbed methane predicted by this model is in good accordance with the field data. The permeability near the wellbore dramatically decreases as the reservoir pressure drops at the early production period while at the later production period, the permeability near the wellbore increases because of the matrix shrinkage. The permeability changes far away from the wellbore are not so remarkable. In addition, the gas production rate increases with the increased permeability, seam thickness and Langmuir pressure constant while it decreases with the increased porosity and Langmuir volume constant.The numerical model can be used to predict and analyze the production performance of CBM reservoirs and the research results provide theoretical support for CBM production.

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Lu, Chunlan, Liwei Pan y Bo Zhu. "Study the Static Adsorption/Desorption of Formaldehyde on Activated Carbons". En 2015 International Forum on Energy, Environment Science and Materials. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/ifeesm-15.2015.173.

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Haglund, R. F., A. V. Barnes, N. Halas, M. H. Mendenhall y Norman H. Tolk. "Electronic transitions in photon-stimulated desorption". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.thj3.

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The discovery that neutral excited-state atoms were desorbed by UV photons with orders of magnitude greater efficiency than ions from alkali-halide surfaces has wrought a fundamental change in our approach to the study of photon-surface interactions, both with synchrotron and laser light sources. In particular, laser-surface interactions in general and laser-induced material damage in particular—once considered primarily due to the absorption of thermal energy from the incident photons—now appear to be linked to electronic interactions both at the surface and in the near-surface bulk, even for photon energies below the bulk band gap. Thus it is appropriate to consider even laser-surface interactions as generically related to the process of desorption induced by electronic transitions (DIETs), a class of energy-surface interactions triggered in exemplary fashion by photons and electrons.

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Du, Min. "Effect of pH on desorption of CO2 from alkanolamine - rich solvents". En GREEN ENERGY AND SUSTAINABLE DEVELOPMENT I: Proceedings of the International Conference on Green Energy and Sustainable Development (GESD 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.4992908.

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Suciu, Claudiu Valentin. "Energy Dissipation During Liquid Adsorption/Desorption In/From Liquid-Repellent Nanochannels". En ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62040.

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Ability of viscous fluids, flowing in narrow interstices, to dissipate the mechanical energy of shock and vibration is well known. In recent years, connected to the nano-technological development, solid-liquid interfaces have been used to dissipate surface energies, in systems where the solid is liquid-repellent; such interfaces are able to store, release or transform the energy. Thus, the contact angle hysteresis can be applied to dissipate the mechanical energy, and this kind of energy loss, in which not the viscosity but the surface tension of the liquid plays the main role, is called surface dissipation. In fact a liquid nano-porosimeter that exhibits nano-damping ability, when applied to mechanical systems is called colloidal damper. Concretely, during the cyclical adsorption/desorption of the liquid (e.g., water or aqueous solutions) in/from the liquid-repellent nanochannels (e.g., modified nanoporous silica gel) the energy is dissipated. Such absorber is convenient from the ecological standpoint since it is oil-free and since both the silica gel (artificial sand with controlled architecture) and the liquid are environment-friendly. Connected to this attractive kind of energy loss, one of the problems awaiting solution is that a theoretical model of the surface dissipation remains to be developed and validated by tests. Accordingly, in this work, based on a detailed discussion of the mechanism of surface dissipation one reveals that the parameters which determine the magnitude of the energy loss are the silica gel mass, the liquid and solid surface tensions, and an integral function (specific pore surface) which is related to the nano-architecture of the liquid-repellent coating, to the silica gel pore architecture and to the maximum applied pressure. Silica gel particles are supposed to be obtained through the aggregation of nano-particles, producing rough nanochannels of variable radius, and normal distribution fits quite well the measured pores size distributions. Heterogeneous molecules of the liquid-repellent coating have a methyl group as head, and a body consisted of methylene groups; they produce a nanopillar structure on the silica gel surface. Maximization of the surface dissipation for imposed working liquid or imposed coating molecule is discussed. Test rig is a compression-decompression chamber used to validate the theoretical findings. Results obtained are useful in general for the appropriate design of liquid-repellent nanochannels with technological applications, and in particular for the absorber optimum design under imposed requirements.

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Tully, John C. "Molecular dynamics of laser-induced desorption". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.thj1.

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Molecular dynamics techniques have been developed to simulate accurately laser-induced chemistry at surfaces with the full complexity of multidimensional interactions. Equations of motion are integrated explicitly for a slab of about fifty atoms with additional adsorbate molecules. Stochastic boundary conditions incorporate energy flow to the remaining bulk atoms and permit transient heating effects to be included correctly. Infrared laser excitation is described by an applied oscillatory external force that drives the dipole moment of the system. The simultations reveal directly the extent of disequilibrium achieved by short-pulse laser excitation. Predictions are made of situations where selective (nonthermal) desorption may be possible.

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Informes sobre el tema "Desorption energy"

Iriso U., P. He, H. C. Hseuh, H. Huang, V. Ptitsyn, L. Smart, P. Thieberger y D. Trbojevic. Interpretation of desorption measurements for high energy beams at RHIC. Office of Scientific and Technical Information (OSTI), noviembre de 2004. http://dx.doi.org/10.2172/1061770.

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Vangelas, K., R. Robert G. Riley, J. James E. Szecsody, A. A. V. Mitroshkov, C. C. F. Brown y B. Brian02 Looney. DESORPTION BEHAVIOR OF TRICHLOROETHENE AND TETRACHLOROETHENE IN U.S. DEPARTMENT OF ENERGY SAVANNAH RIVER SITE UNCONFINED AQUIFER SEDIMENTS. Office of Scientific and Technical Information (OSTI), enero de 2007. http://dx.doi.org/10.2172/899958.

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Riley, Robert G., Jim E. Szecsody, Alexandre V. Mitroshkov y Christopher F. Brown. Desorption Behavior of Trichloroethene and Tetrachloroethene in U.S. Department of Energy Savannah River Site Unconfined Aquifer Sediments. Office of Scientific and Technical Information (OSTI), junio de 2006. http://dx.doi.org/10.2172/899154.

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Shott, Gregory y Dawn Reed. Unreviewed Disposal Question Evaluation: Disposal of the Materials & Energy Corporation Thermal Desorption Low-Level Waste at the Area 5 Radioactive Waste Management Site, Nevada National Security Site, Nye County, Nevada. Office of Scientific and Technical Information (OSTI), septiembre de 2017. http://dx.doi.org/10.2172/1507592.

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