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Journal articles on the topic 'Langmuir-Hinshelwood mechanism'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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1

Xiang, Jinyao, Xuesen Du, Yuyi Wan, Yanrong Chen, Jingyu Ran, and Li Zhang. "Alkali-driven active site shift of fast SCR with NH3 on V2O5–WO3/TiO2 catalyst via a novel Eley–Rideal mechanism." Catalysis Science & Technology 9, no. 21 (2019): 6085–91. http://dx.doi.org/10.1039/c9cy01565e.

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The heterogeneous SCR reaction obeys the well-known Eley–Rideal mechanism or Langmuir–Hinshelwood mechanism, while fast SCR over alkali-doping catalysts follows the another “E–R” mechanism with adsorbed NO2.
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2

Baxter, R. J., and P. Hu. "Insight into why the Langmuir–Hinshelwood mechanism is generally preferred." Journal of Chemical Physics 116, no. 11 (March 15, 2002): 4379–81. http://dx.doi.org/10.1063/1.1458938.

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3

Singh, Archana, Veerabhadraiah Palakollu, Aman Pandey, Sriram Kanvah, and Sudhanshu Sharma. "Green synthesis of 1,4-benzodiazepines over La2O3 and La(OH)3 catalysts: possibility of Langmuir–Hinshelwood adsorption." RSC Advances 6, no. 105 (2016): 103455–62. http://dx.doi.org/10.1039/c6ra22719h.

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4

Borovinskaya, Ekaterina. "Redundancy-Free Models for Mathematical Descriptions of Three-Phase Catalytic Hydrogenation of Cinnamaldehyde." Catalysts 11, no. 2 (February 4, 2021): 207. http://dx.doi.org/10.3390/catal11020207.

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A new approach on how to formulate redundancy-free models for mathematical descriptions of three-phase catalytic hydrogenation of cinnamaldehyde is presented. An automatically created redundant (generalized) model is formulated according to the complete reaction network. Models based on formal kinetics and kinetics concerning the Langmuir-Hinshelwood theory for three-phase catalytic hydrogenation of cinnamaldehyde were investigated. Redundancy-free models were obtained as a result of a step-by-step elimination of model parameters using sensitivity and interval analysis. Starting with 24 parameters in the redundant model, the redundancy-free model based on the Langmuir-Hinshelwood mechanism contains 6 parameters, while the model based on formal kinetics includes only 4 parameters. Due to less degrees of freedom of molecular rotation in the adsorbed state, the probability of a direct conversion of cinnamaldehyde to 3-phenylpropanol according to the redundancy-free model based on Langmuir-Hinshelwood approach is practically negligible compared to the model based on formal kinetics.
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5

Atitar, M. Faycal, Asmae Bouziani, Ralf Dillert, Mohamed El Azzouzi, and Detlef W. Bahnemann. "Photocatalytic degradation of the herbicide imazapyr: do the initial degradation rates correlate with the adsorption kinetics and isotherms?" Catalysis Science & Technology 8, no. 4 (2018): 985–95. http://dx.doi.org/10.1039/c7cy01903c.

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The Langmuir–Hinshelwood mechanism applies to the photocatalytic degradation of imazapyr only when assuming the occurence of light-induced changes of the photocatalyst surface affecting the adsorption of the probe molecule.
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6

Gao, Xiaoyan, Yunhong Zhang, and Yong Liu. "A kinetics study of the heterogeneous reaction ofn-butylamine with succinic acid using an ATR-FTIR flow reactor." Physical Chemistry Chemical Physics 20, no. 22 (2018): 15464–72. http://dx.doi.org/10.1039/c8cp01914b.

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Heterogeneous reaction between succinic acid thin film and gas phasen-butylamine was studied, and results show that the reaction follows Langmuir–Hinshelwood mechanism and overall kinetics is dominated by surface reaction.
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7

Rai, Sandhya, Masahiro Ehara, and U. Deva Priyakumar. "Nucleobases tagged to gold nanoclusters cause a mechanistic crossover in the oxidation of CO." Physical Chemistry Chemical Physics 17, no. 37 (2015): 24275–81. http://dx.doi.org/10.1039/c5cp04273a.

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A mechanistic crossover is observed upon using nucleobase tagged gold clusters as catalysts favoring the Eley–Rideal mechanism, over the conventional Langmuir–Hinshelwood pathway followed using pristine gold clusters during CO oxidation.
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8

Mehrvar, Mehrab, William A. Anderson, and Murray Moo-Young. "Photocatalytic degradation of aqueous tetrahydrofuran, 1,4-dioxane, and their mixture with TiO2." International Journal of Photoenergy 2, no. 2 (2000): 67–80. http://dx.doi.org/10.1155/s1110662x00000106.

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Photocatalytic degradation of tetrahydrofuran, 1,4-dioxane, and their mixture in a slurry photoreactor was studied. Using both GC/MS and ion chromatography (IC) methods, possible intermediates were detected and the reaction mechanism pathways for both compounds were proposed. Kinetic models were developed and the kinetic parameters were estimated using a statistical method of non-linear parameter estimation in which all experimental data were utilized. It was shown that tetrahydrofuran was disappeared via direct oxidation as well as hydroxyl radical attack. A modified Langmuir-Hinshelwood described the degradation behavior of tetrahydrofuran and the binary system. 1,4-Dioxane obeyed a simple Langmuir-Hinshelwood kinetic form in the single compound system.
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9

Camu, Esteban, Cesar Pazo, Daniel Becerra, Yoan Hidalgo-Rosa, Dayan Paez-Hernandez, Ximena Zarate, Eduardo Schott, and Nestor Escalona. "A new approach to the mechanism for the acetalization of benzaldehyde over MOF catalysts." New Journal of Chemistry 44, no. 35 (2020): 14865–71. http://dx.doi.org/10.1039/d0nj02416c.

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The benzaldehyde acetalization catalyzed by UiO-66 and UiO-66F, was carried out in a batch-type reactor at room temperature and atmospheric pressure, and the full kinetic study was performed using the Langmuir–Hinshelwood and Eley–Rideal models.
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10

Zhao, Bo, Jun Han, Linbo Qin, Wangsheng Chen, Zijian Zhou, and Futang Xing. "Impact of individual flue gas components on mercury oxidation over a V2O5–MoO3/TiO2 catalyst." New Journal of Chemistry 42, no. 24 (2018): 20190–96. http://dx.doi.org/10.1039/c8nj05084h.

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11

Zeinalipour-Yazdi, Constantinos D. "Mechanistic aspects of ammonia synthesis on Ta3N5 surfaces in the presence of intrinsic nitrogen vacancies." Physical Chemistry Chemical Physics 23, no. 11 (2021): 6959–63. http://dx.doi.org/10.1039/d1cp00275a.

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Intrinsic nitrogen vacancies can become catalytic centers for the ammonia synthesis reaction on Ta3N5via a Langmuir–Hinshelwood mechanism. Dinitrogen is activated in a peculiar side on a sandwich-like configuration between two surface Ta atoms.
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12

Kaloti, Mandeep, Anil Kumar, and Naveen K. Navani. "Synthesis of glucose-mediated Ag–γ-Fe2O3 multifunctional nanocomposites in aqueous medium – a kinetic analysis of their catalytic activity for 4-nitrophenol reduction." Green Chemistry 17, no. 10 (2015): 4786–99. http://dx.doi.org/10.1039/c5gc00941c.

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The synthesis of glucose-mediated Ag–γ-Fe2O3 nanocomposites in aqueous medium, exhibiting catalytic activity for 4-nitrophenol reduction to 4-aminophenol following the Langmuir–Hinshelwood mechanism at lower [Ag] (μM) (0.3, SPLAg; 6.4, SPHAg), is reported.
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13

Khan, K. M., N. Ahmad, and E. V. Albano. "Catalytic formation of ammonia: a lattice gas non-thermal Langmuir–Hinshelwood mechanism." Surface Science 494, no. 2 (November 2001): 111–18. http://dx.doi.org/10.1016/s0039-6028(01)01444-3.

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14

Doukeh, Rami, Mihaela Bombos, and Ion Bolocan. "Comparative Study Between two Reaction Kinetic Mechanisms of Thiophene Hydrodesulphurization over CoMo /gama - Al2O3 Supported Catalyst." Revista de Chimie 70, no. 7 (August 15, 2019): 2481–84. http://dx.doi.org/10.37358/rc.19.7.7365.

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The kinetic study of the thiophene hydrodesulphurisation process was carried out for CoMo/gama-Al2O3 catalyst, at temperatures between 175 and 275 �C, pressure ranged from 30bar to 60 bar and the liquid hourly space velocity from 1h-1 to 4 h-1. For the reaction mechanism, the Langmuir-Hinshelwood-Hougen-Watson model (LHHW) was used and two kinetic models were proposed: the first model, that considered that H2 is adsorbed on a different type of active center than thiophene and the second model, that considered that the two reactants are adsorbed on the same type of active sites. The values obtained for the average relative error (ARE) and the correlation coefficient between the experimental and the calculated data (R2) indicate that the Langmuir-Hinshelwood model, describing the adsorption on two active sites, best describes the kinetics of the thiophene hydrodesulfurization reaction over CoMo/gama-Al2O3 tested catalyst.
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15

Khan, K. M., and E. V. Albano. "Catalytic oxidation of carbon monoxide: a lattice gas non-thermal Langmuir–Hinshelwood mechanism." Chemical Physics 276, no. 2 (February 2002): 129–37. http://dx.doi.org/10.1016/s0301-0104(01)00574-2.

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16

Zelenov, V. V., and E. V. Aparina. "Reaction Mechanism of Ozone with Methane Flame Soot: Langmuir–Hinshelwood or Unimolecular Decomposition?" Russian Journal of Physical Chemistry B 15, no. 3 (May 2021): 547–58. http://dx.doi.org/10.1134/s1990793121030143.

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17

Styler, S. A., M. E. Loiseaux, and D. J. Donaldson. "Substrate effects in the photoenhanced ozonation of pyrene." Atmospheric Chemistry and Physics Discussions 10, no. 11 (November 15, 2010): 27825–52. http://dx.doi.org/10.5194/acpd-10-27825-2010.

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Abstract. We report the effects of actinic illumination on the heterogeneous ozonation kinetics of solid pyrene films and pyrene adsorbed at air-octanol and air-aqueous interfaces. Upon illumination, the ozonation of solid pyrene films and pyrene at the air-aqueous interface proceeds more quickly than in darkness; no such enhancement is observed for pyrene at the air-octanol interface. Under dark conditions, the reaction of pyrene at all three interfaces proceeds via a Langmuir-Hinshelwood-type surface mechanism. In the presence of light, Langmuir-Hinshelwood kinetics are observed for solid pyrene films but a linear dependence upon gas-phase ozone concentration is observed at the air-aqueous interface. We interpret these results as evidence of the importance of charge-transfer pathways for the ozonation of excited-state pyrene. The dramatically different behaviour of pyrene at the surface of these three simple reaction environments highlights the difficulties inherent in representing complex reactive surfaces in the laboratory, and suggests caution in extrapolating laboratory results to environmental surfaces.
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18

Styler, S. A., M. E. Loiseaux, and D. J. Donaldson. "Substrate effects in the photoenhanced ozonation of pyrene." Atmospheric Chemistry and Physics 11, no. 3 (February 14, 2011): 1243–53. http://dx.doi.org/10.5194/acp-11-1243-2011.

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Abstract. We report the effects of actinic illumination on the heterogeneous ozonation kinetics of solid pyrene films and pyrene adsorbed at air-octanol and air-aqueous interfaces. Upon illumination, the ozonation of solid pyrene films and pyrene at the air-aqueous interface proceeds more quickly than in darkness; no such enhancement is observed for pyrene at the air-octanol interface. Under dark conditions, the reaction of pyrene at all three interfaces proceeds via a Langmuir-Hinshelwood-type surface mechanism. In the presence of light, Langmuir-Hinshelwood kinetics are observed for solid pyrene films but a linear dependence upon gas-phase ozone concentration is observed at the air-aqueous interface. We interpret these results as evidence of the importance of charge-transfer pathways for the ozonation of excited-state pyrene. The dramatically different behaviour of pyrene at the surface of these three simple reaction environments highlights the difficulties inherent in representing complex reactive surfaces in the laboratory, and suggests caution in extrapolating laboratory results to environmental surfaces.
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19

Gao, Erhao, Bei Huang, Zilong Zhao, Hua Pan, Wei Zhang, Younan Li, Matthew T. Bernards, Yi He, and Yao Shi. "Understanding the co-effects of manganese and cobalt on the enhanced SCR performance for MnxCo1−xCr2O4 spinel-type catalysts." Catalysis Science & Technology 10, no. 14 (2020): 4752–65. http://dx.doi.org/10.1039/d0cy00872a.

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A novel ternary Mn0.1Co0.9Cr2O4 catalyst was identified from a range of chromium-based spinel-type oxides for the SCR of NOx in coking flue gas. The SCR reaction mainly occurs between the adsorbed NH3 and the adsorbed nitrates, following the Langmuir–Hinshelwood mechanism.
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20

Morisset, S., F. Aguillon, M. Sizun, and V. Sidis. "Quantum dynamics of H2 formation on a graphite surface through the Langmuir Hinshelwood mechanism." Journal of Chemical Physics 121, no. 13 (October 2004): 6493–501. http://dx.doi.org/10.1063/1.1781118.

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21

Galván Muciño, Gabriel E., Rubi Romero, Armando Ramírez, María Jesús Ramos, Ramiro Baeza-Jiménez, and Reyna Natividad. "Kinetics of Transesterification of Safflower Oil to Obtain Biodiesel Using Heterogeneous Catalysis." International Journal of Chemical Reactor Engineering 14, no. 4 (August 1, 2016): 929–38. http://dx.doi.org/10.1515/ijcre-2015-0108.

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Abstract The kinetics of the transesterification of safflower oil and methanol catalyzed by K2O/NaX was studied and modeled. The influence of the oil-methanol initial molar ratio and amount of catalyst were investigated to achieve a maximum triglycerides conversion (99 %) and a final methyl esters content of 94 % ±1. A kinetic model based on an Eley–Rideal mechanism was found to best fit the experimental data when assuming methanol adsorption as determining step. Other models derived from Langmuir – Hinshelwood – Hougen –Watson (LHHW) mechanisms were rejected based on statistical analysis, mechanistic considerations and physicochemical interpretation of the estimated parameters.
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22

Kocemba, Ireneusz, Sławomir Szafran, Jacek Rynkowski, and Tadeusz Paryjczak. "Relationship between the Catalytic and Detection Properties of SnO2 and Pt/SnO2 Systems." Adsorption Science & Technology 20, no. 9 (November 2002): 897–905. http://dx.doi.org/10.1260/02636170260555804.

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Semiconductor gas sensors based on metal oxides have been widely accepted as an important tool for the detection of different gases in air. An understanding of all the mechanisms related to such detection is essential in order to improve the sensitivity and selectivity of these gas detectors. This paper considers the mechanism of detection by semiconductor oxide gas sensors in terms of catalytic reactions described by Rideal–Eley and Langmuir–Hinshelwood mechanisms. Some relationships were discussed between the catalytic and detection properties of SnO2 and Pt/SnO2 systems used on the one hand as catalysts of low-temperature CO oxidation and on the other hand as sensors of CO in air.
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23

Urmès, Caroline, Jean-Marc Schweitzer, Amandine Cabiac, and Yves Schuurman. "Kinetic Study of the Selective Hydrogenation of Acetylene over Supported Palladium under Tail-End Conditions." Catalysts 9, no. 2 (February 14, 2019): 180. http://dx.doi.org/10.3390/catal9020180.

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The kinetics of the selective hydrogenation of acetylene in the presence of an excess of ethylene has been studied over a 0.05 wt. % Pd/α-Al2O3 catalyst. The experimental reaction conditions were chosen to operate under intrinsic kinetic conditions, free from heat and mass transfer limitations. The data could be described adequately by a Langmuir–Hinshelwood rate-equation based on a series of sequential hydrogen additions according to the Horiuti–Polanyi mechanism. The mechanism involves a single active site on which both the conversion of acetylene and ethylene take place.
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24

Bandyopadhyay, Debajyoti, and Ahindra Ghosh. "Validity of rate equation based on Langmuir-Hinshelwood mechanism for gasification of carbon - a reappraisal." Steel Research 67, no. 3 (March 1996): 79–86. http://dx.doi.org/10.1002/srin.199605462.

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25

Morisset, S., F. Aguillon, M. Sizun, and V. Sidis. "Wave-packet study of H2 formation on a graphite surface through the Langmuir–Hinshelwood mechanism." Journal of Chemical Physics 122, no. 19 (May 15, 2005): 194702. http://dx.doi.org/10.1063/1.1896353.

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26

Madriz, Lorean, José Tatá, and Ronald Vargas. "The Photocatalytic Oxidation of 4-Chlorophenol Using Bi2WO6 under Solar Light Irradiation." International Journal of Photochemistry 2014 (August 5, 2014): 1–6. http://dx.doi.org/10.1155/2014/387536.

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This report discusses the effects of the initial concentration of 4-chlorophenol (4-CP) on its solar light photoinduced oxidation/mineralization kinetics on Bi2WO6 catalyst. Photocatalytic degradation followed the Langmuir-Hinshelwood (L-H) mechanism. From the kinetic data the Langmuir adsorption equilibrium constant of 4-CP on the Bi2WO6 surface and the L-H maximum reaction rate for 4-CP oxidation have been evaluated. Chromatographic and spectroscopy studies show the presence of p-benzoquinone and maleic acid as the main reaction products; these compounds first increase and then decay until they disappear. Chemical oxygen demand (COD) and produced CO2 measurement show that photocatalytic mineralization of the phenolic compound was readily possible in a wide concentration range.
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27

Zhang, Yuwei, Ping Song, Tiankai Chen, Xiaodong Liu, Tao Chen, Zhemin Wu, Yong Wang, Jianping Xie, and Weilin Xu. "Unique size-dependent nanocatalysis revealed at the single atomically precise gold cluster level." Proceedings of the National Academy of Sciences 115, no. 42 (October 1, 2018): 10588–93. http://dx.doi.org/10.1073/pnas.1805711115.

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Atomically precise metal clusters have attracted increasing interest owing to their unique size-dependent properties; however, little has been known about the effect of size on the catalytic properties of metal clusters at the single-cluster level. Here, by real-time monitoring with single-molecule fluorescence microscopy the size-dependent catalytic process of individual Au clusters at single-turnover resolution, we study the size-dependent catalytic behaviors of gold (Au) clusters at the single-cluster level, and then observe the strong size effect on the catalytic properties of individual Au clusters, in both catalytic product formation and dissociation processes. Surprisingly, indicated by both experiments and density functional theory (DFT) calculations, due to such a unique size effect, besides observing the different product dissociation behaviors on different-sized Au clusters, we also observe that small Au clusters [i.e., Au15(MPA)13; here, MPA denotes 3-mercaptopropionic acid] catalyze the product formation through a competitive Langmuir–Hinshelwood mechanism, while those relatively larger Au clusters [e.g., Au18(MPA)14 and Au25(MPA)18] or nanoparticles catalyze the same process through a noncompetitive Langmuir–Hinshelwood mechanism. Such a size effect on the nanocatalysis could be attributed intrinsically to the size-dependent electronic structure of Au clusters. Further analysis of dynamic activity fluctuation of Au clusters reveals more different catalytic properties between Au clusters and traditional Au nanoparticles due to their different size-dependent structures.
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28

Youssef, Carlos, Eric Puzenat, Samir Najm, Nicole Jaffrezic-Renault, and Chantal Guillard. "Effect of Oxygen and Water in the CO Photocatalytic Oxidation with TiO2." Advanced Materials Research 324 (August 2011): 149–52. http://dx.doi.org/10.4028/www.scientific.net/amr.324.149.

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TiO2P25 catalyst was used to study the photocatalytic oxidation of CO to CO2at 288K. Two parameters, O2and H2O were used to study its effect on the photocatalytic process. The dependency of the reaction rate on the CO concentration and water vapor was explained in terms of Langmuir-Hinshelwood mechanism. The presence of a high concentration of water vapor inhibits the CO photocatalytic oxidation at low oxygen concentration. We have noted an adsorption competition between CO and H2O on the TiO2active sites.
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29

Kostrobij, Petro, and Iryna Ryzha. "Numerical analysis of mathematical model for CO oxidation on platinum." Physico-mathematical modelling and informational technologies, no. 32 (July 8, 2021): 165–69. http://dx.doi.org/10.15407/fmmit2021.32.165.

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In the paper a study of a two-dimensional mathematical model of carbon monoxide oxidation on the Pt catalyst surface according to the Langmuir-Hinshelwood mechanism is presented. This model takes into account the nanoinhomogeneities of Pt(110) surface and diffusion processes of CO molecules and oxygen atoms adsorbed on the catalyst surface. It is shown that the structural changes of Pt(110) surface significantly affect the character of oscillatory mode of reaction, whereas the adsorbed oxygen atoms can be considered immobile.
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30

Dai, Guoliang, Lei Chen, and Xin Zhao. "Tungsten-Embedded Graphene: Theoretical Study on a Potential High-Activity Catalyst toward CO Oxidation." Materials 11, no. 10 (September 28, 2018): 1848. http://dx.doi.org/10.3390/ma11101848.

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The oxidation mechanism of CO on W-embedded graphene was investigated by M06-2X density functional theory. Two models of tungsten atom embedded in single and double vacancy (W-SV and W-DV) graphene sheets were considered. It was found that over W-SV-graphene and W-DV-graphene, the oxidation of CO prefers to Langmuir-Hinshelwood (LH) and Eley-Rideal (ER) mechanism, respectively. The two surfaces exhibit different catalytic activity during different reaction stages. The present results imply that W-embedded graphene is a promising catalyst for CO oxidation, which provides a useful reference for the design of a high-efficiency catalyst in detecting and removing of toxic gases.
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31

Gómez-Marín, Ana M., and Juan P. Hernández-Ortiz. "Langmuir–Hinshelwood Mechanism Including Lateral Interactions and Species Diffusion for CO Electro-Oxidation on Metallic Surfaces." Journal of Physical Chemistry C 118, no. 5 (January 24, 2014): 2475–86. http://dx.doi.org/10.1021/jp409385k.

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32

Royaee, Sayed Javid, Cavus Falamaki, Morteza Sohrabi, and Sayed Siamak Ashraf Talesh. "A new Langmuir–Hinshelwood mechanism for the methanol to dimethylether dehydration reaction over clinoptilolite-zeolite catalyst." Applied Catalysis A: General 338, no. 1-2 (April 2008): 114–20. http://dx.doi.org/10.1016/j.apcata.2008.01.011.

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33

Kumari, Priyanka, and Abha Meena. "Green synthesis of gold nanoparticles from Lawsoniainermis and its catalytic activities following the Langmuir-Hinshelwood mechanism." Colloids and Surfaces A: Physicochemical and Engineering Aspects 606 (December 2020): 125447. http://dx.doi.org/10.1016/j.colsurfa.2020.125447.

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34

Sorooshian, Jamshid, Leonard Borucki, David Stein, Robert Timon, Dale Hetherington, and Ara Philipossian. "Revisiting the Removal Rate Model for Oxide CMP." Journal of Tribology 127, no. 3 (June 13, 2005): 639–51. http://dx.doi.org/10.1115/1.1866168.

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This study seeks to explain removal rate trends and scatter in thermal silicon dioxide and PECVD tetraethoxysilane-sourced silicon dioxide (PE-TEOS) CMP using an augmented version of the Langmuir-Hinshelwood mechanism. The proposed model combines the chemical and mechanical facets of interlevel dielectric (ILD) CMP and hypothesizes that the chemical reaction temperature is determined by transient flash heating. The agreement between the model and data suggests that the main source of apparent scatter in removal rate data plotted as rate versus pressure times velocity is competition between mechanical and thermochemical mechanisms. A method of visualizing removal rate data is described that shows, apart from any particular interpretative theory, that a smooth and easily interpretable surface underlies the apparent scatter.
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35

Lovic, Jelena. "The kinetics and mechanism of methanol oxidation on Pt and PtRu catalysts in alkaline and acid media." Journal of the Serbian Chemical Society 72, no. 7 (2007): 709–12. http://dx.doi.org/10.2298/jsc0707709l.

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The kinetic of methanol electrochemical oxidation for a series of platinum and platinum-ruthenium catalysts was investigated. A correlation between the beginning of OHad adsorption and methanol oxidation was demonstrated on Pt single crystals and Pt nanocatalyst. The activity of the nano-structured Pt catalyst was compared with single crystal platinum electrodes assuming the Kinoshita model of nanoparticles. The ruthenium-containing catalysts shifted the onset of methanol oxidation to more negative potentials. The effect was more pronounced in acid than in alkaline media. Based on the established diagnostic criteria, the reaction between COad and OHad species according to the Langmuir-Hinshelwood mechanism was proposed as the rate determining step in alkaline and acid media on Pt and PtRu catalysts. .
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36

Widi, Restu Kartiko. "KINETIC INVESTIGATION OF PROPANE DISAPPEARANCE AND PROPENE FORMATION IN PROPANE OXIDATION ON DILUTED AND LEACHED MoVTeNb CATALYST." Indonesian Journal of Chemistry 10, no. 2 (July 21, 2010): 172–76. http://dx.doi.org/10.22146/ijc.21456.

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Reaction kinetics for the oxidation of propane over diluted-leached MoVTeNb is described. This paper is focused on the study of products selectivity profile and determination of the orders of propane disappearance and propene formation. The result shows that selective oxidation of propane to propene over this catalyst follows the Langmuir-Hinshelwood mechanism. The disappearance of propane is first order with respect to hydrocarbon and partial order (0.21) with respect to oxygen. The propene formation is first order with respect to hydrocarbon and not depending on oxygen concentration. Keywords: propane oxidation, propane disappearance, propene formation, kinetic, reaction order
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37

Cheng, Jie, Jian Zhang Li, Jun Bo Zhong, and Wei Hu. "Fabrication and Photocatalytic Decolorization Performance of ZnO." Advanced Materials Research 396-398 (November 2011): 823–26. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.823.

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Paralled flaw precipitation method has been employed to synthesize nanostructured ZnO. The prepared photocatalyst was characterized by BET, XRD. The paper reveals that Methyl Orange (MO) can be decolorized effectively in ZnO suspension system under UV irradiation. The optimal loading of photocatalyst in our experimental condition for the decolorization of MO is 1g/L. The present study, on the base of Langmuir-Hinshelwood mechanism, illustrates that the decolorization reaction is a pseudo first order kinetic model with the limiting rate constant of 8.48×10-2 mgL-1min-1 and equilibrium adsorption constant 0.335 L/mg, respectively.
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38

ur Rashid, Haroon, M. Sohail Ahmad, Mohammad Sadiq, and Razia Aman. "Potent Heterogeneous Catalyst for Low Temperature Selective Oxidation of Cyclohexanol by Molecular Oxygen." Journal of Chemistry 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/1254796.

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Platinum supported on zirconium dioxide catalyst was prepared by standard method and characterized by SEM, EDX, XRD, BET surface area and pore size analyzer, and FT-IR. The catalyst was screened for its catalytic activity in a model reaction, selective oxidation of cyclohexanol. The only one major product, cyclohexanone 31%, with 99.8% selectivity was obtained. Experimental data was analyzed through different kinetic models and we deduced that the reaction follows Langmuir-Hinshelwood mechanism. The apparent activation energy for the model reaction was calculated as 45 kJ/mole. The catalyst was regenerated several times with same efficiency.
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39

REN, XIU-BIN, and XIANG-YUN GUO. "INFLUENCE OF THE REACTION TEMPERATURE ON THE OSCILLATORY BEHAVIOR DURING PARTIAL OXIDATION OF METHANE." Surface Review and Letters 15, no. 06 (December 2008): 769–74. http://dx.doi.org/10.1142/s0218625x0801213x.

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The oscillatory behavior during partial oxidation of methane was studied by the Monte Carlo simulation with Langmuir–Hinshelwood mechanism and oxide formation and removal. The well-developed reaction rate oscillations can be observed when the CH 4 adsorption probability varies in a small window. The oscillation window is very sensitive to the variation of reaction temperature. When the temperature increases, the window for sustained oscillation becomes narrow and has an obvious shift. In the meantime, the oscillation period tends to become small and the amplitude decreases. When the temperature increases to a certain value, the oscillations will disappear.
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40

Khuzwayo, Z., and E. M. N. Chirwa. "Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach." Journal of Hazardous Materials 300 (December 2015): 459–66. http://dx.doi.org/10.1016/j.jhazmat.2015.07.034.

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41

Yun, Yupan, Xueyou Wen, Zhao Liang, and Zhenya Zhu. "Study on reaction mechanism and Langmuir-Hinshelwood kinetic model of catalytic denitrification by Fe0 and bimetallic catalyst." Journal of Environmental Science and Health, Part A 56, no. 5 (February 27, 2021): 501–7. http://dx.doi.org/10.1080/10934529.2021.1890496.

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42

Čížek, Milan, and Vladimír Pour. "Kinetics of the reduction of nitrogen oxide and dinitrogen oxide by ammonia on a V2O5/Al2O3 catalyst in the absence of oxygen." Collection of Czechoslovak Chemical Communications 51, no. 11 (1986): 2528–36. http://dx.doi.org/10.1135/cccc19862528.

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The kinetics of the reduction of NO and N2O by ammonia on a V2O5/Al2O3 catalyst (15 mass % V2O5) have been measured over the temperature range 300-480 °C at atmospheric pressure. The presence of water vapour in the reaction mixture retards the reduction rates of both NO and N2O. The oxidation state of vanadium does not change within the concentration and temperature ranges investigated. From the results for the reaction kinetics and the oxidation state of vanadium it is concluded that the reduction of NO and N2O by ammonia occurs by the associative Langmuir-Hinshelwood mechanism with the surface reaction as the rate-determining step.
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43

Bettoni, Marta, Stefano Falcinelli, Cesare Rol, Marzio Rosi, and Giovanni Vittorio Sebastiani. "Gas-Phase TiO2 Photosensitized Mineralization of Some VOCs: Mechanistic Suggestions through a Langmuir–Hinshelwood Kinetic Approach." Catalysts 11, no. 1 (December 26, 2020): 20. http://dx.doi.org/10.3390/catal11010020.

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A jointed experimental and theoretical investigation pointing out new insights about the microscopic mechanism of the volatile organic compounds (VOCs) photocatalytic elimination by TiO2 was done. Methane, hexane, isooctane, acetone and methanol were photomineralized in a batch reactor. Values of K (adsorption constant on TiO2) and k (mineralization rate constant) of the five VOCs (treating the kinetic data through a Langmuir–Hinshelwood approach) were determined. Recorded K (in the range of 0.74 × 10−2–1.11 × 10−2 ppm−1) and k (in the range of 1.9–9.9 ppm min−1) values and performed theoretical calculations allowed us to suggest the involvement of an electron transfer step between the VOC and the hole, TiO2(h+), as the rate-determining one.
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44

Jing, Qi, and Huan li. "Catalytic Air Oxidation of Refractory Organics in Wastewater." Current Organocatalysis 7, no. 3 (November 30, 2020): 179–98. http://dx.doi.org/10.2174/2213337207999200802025735.

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Catalytic air oxidation (CAO) is an economical, environmentally friendly, and efficient technology used to treat wastewater that contains refractory organics. This review analyzes recent studies regarding five common types of CAO that use external energy sources (heat, light radiation, microwave, and electricity) or non-oxidizing chemical promoters (nitrites and sulfites). Methods include hydrothermal, electro-assisted, photocatalytic, microwave-assisted, and non-oxidizing chemical-assisted CAO. The associated catalytic mechanisms are discussed in detail in order to explain the connections between CAO catalytic pathways. Mechanisms include O2 activation via excitation, free-radical autocatalytic reactions, and coordination catalysis. Classical kinetic mechanisms, including Mars-van Krevelen and Langmuir-Hinshelwood, are also proposed to reveal overall CAO dynamic processes. The catalysts used in each CAO technology are summarized, with a focus on their catalytic pathways and the methods by which they might be improved. Finally, important challenges and research directions are proposed. The proposals focus on further research regarding catalyst mechanisms, mechanism-guided catalyst design, and process improvement.
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45

Vicente, J. L., A. Maltz, and E. E. Mola. "Analytical Treatment of a Heterogeneous Reaction." Surface Review and Letters 05, no. 02 (April 1998): 545–50. http://dx.doi.org/10.1142/s0218625x9800092x.

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An analytical method has been used to study the kinetics of a generic heterogeneous catalytic reaction, A + B → AB. This reaction includes the elementary steps of adsorption and desorption of reactants A and B, surface reaction through the Langmuir-Hinshelwood mechanism, and desorption of the product AB. Despite its simplicity, this analytical approach shows some of the general features observed by simulating the present mechanism on a large N × N lattice.5–7 The rate of reaction depends on the rate of desorption of reactants with a maximum at a value similar to those found by performing heavy simulations. Coverage fluctuations of reactants, as a function of their rate of desorption on a 2 × 2 lattice, have a behavior similar to that found on large N × N lattices.
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46

Saeed, Muhammad, Muhammad Asghar Jamal, Atta-ul Haq, Mohammad Ilyas, Mohammad Younas, and Muhammad Azhar Shahzad. "Oxidative Degradation of Methylene Blue in Aqueous Medium Catalyzed by Lab Prepared Nickel Hydroxide." International Journal of Chemical Reactor Engineering 14, no. 1 (February 1, 2016): 45–51. http://dx.doi.org/10.1515/ijcre-2015-0088.

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AbstractThis study explores the lab prepared nickel hydroxide catalyzed oxidative degradation of Methylene Blue (MB) in aqueous medium using batch reactor. Nickel hydroxide was prepared by reaction of sodium hypochlorite, sodium hydroxide and nickel sulphate hexahydrate in distilled water. The catalytic oxidative degradation of Methylene Blue was explored in terms of various parameters like effect of time, hydrogen peroxide, temperature, initial concentration of dye, catalyst dosage and effect of speed of agitation on degradation of Methylene Blue. Experimental data was subjected to kinetics analysis using Curve Expert software. Degradation reaction was taking place according to Langmuir-Hinshelwood mechanism. According to this mechanism the reactants adsorb at the surface of catalyst in first step followed by chemical reaction between adsorbed reactants in second step. Catalyst was heterogeneous in nature which was separated by simple filtration easily.
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47

Ilhan, S., A. O. Kalpakli, C. Kahruman, and I. Yusufoglu. "The use of Langmuir–Hinshelwood mechanism to explain the kinetics of calcium molybdate leaching in oxalic acid solution." Hydrometallurgy 127-128 (October 2012): 91–98. http://dx.doi.org/10.1016/j.hydromet.2012.07.011.

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48

IMBIHL, R. "TURING STRUCTURES IN CATALYTIC SURFACE REACTIONS: THE FACETTING OF Pt(110) IN CO + O2." Modern Physics Letters B 06, no. 09 (April 20, 1992): 493–505. http://dx.doi.org/10.1142/s0217984992000570.

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Exposing a Pt(110) surface to catalytic CO oxidation causes the development of a regular facet pattern of microscopic dimensions which has been identified as a dissipative structure of the Turing type. The primary step in the facetting process is considered to be the [Formula: see text] phase transition which is also responsible for the occurrence of kinetic oscillations in the same system. This interpretation was confirmed in a Monte Carlo simulation which was based on the Langmuir-Hinshelwood mechanism of catalytic CO oxidation and the properties of the surface phase transition. Thus a detailed microscopic description is available for the process by which a Turing structure is formed during a surface reaction.
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49

KHAN, K. M., and K. IQBAL. "EXISTENCE OF A "HOT" ATOM MECHANISM FOR THE DISSOCIATION OF O2 ON Pt (111) AND THE PHASE DIAGRAM OF CATALYTIC OXIDATION OF CO." Surface Review and Letters 11, no. 01 (February 2004): 117–21. http://dx.doi.org/10.1142/s0218625x04005846.

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The catalytic oxidation of CO has already been studied over a square surface through Monte-Carlo simulation via a model based on the Langmuir–Hinshelwood mechanism, in which dissociated adsorption of the O 2 molecule is considered on a pair of vacancies in the nearest neighborhood. The results of this study are well known. Here, we have studied this reaction on the basis of an experimentally observed hot atom mechanism on the Pt (111) surface. According to this mechanism the probability of adsorption of the O 2 molecule on a pair of vacancies in the nearest neighborhood is negligibly small. It is shown that if the two oxygen atoms are adsorbed at two lattice constants apart, then the model yields a steady reactive window where the continuous transition disappears. The production of CO 2 starts the moment CO partial pressure departs from zero, which is seen in the experimental situation.
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50

Li, Jian, Tuqiao Zhang, and Miaomiao Ye. "Heterogeneous oxidation of diclofenac in the presence of α-MnO2 nanorods: influence of operating factors and mechanism." Water Science and Technology 71, no. 9 (March 5, 2015): 1340–46. http://dx.doi.org/10.2166/wst.2015.068.

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Diclofenac (DCF), one of the pharmaceutical and personal care products that has been widely detected in water, was selected as a model pollutant to evaluate the oxidation activity of α-MnO2 nanorods. The results showed that the heterogeneous oxidation process is highly pH dependent, with higher degradation efficiency at lower pH values. The complete removal of DCF was obtained within 80 min at the solution pH value of 2.5. The oxidation kinetics of DCF can be modeled by Langmuir–Hinshelwood equation (R2 > 0.999). The effects of various operating parameters, including initial solution pH, α-MnO2 dosage, anions, and cations, on the oxidation efficiency were investigated in detail. A possible reaction pathway for DCF was proposed. In addition, it was demonstrated that the α-MnO2 nanorods can be recycled without decreasing their oxidation activity after 10 cycles.
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