Статті в журналах з теми "Methane activation chemistry"

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1

Sharma, Richa, Hilde Poelman, Guy B. Marin, and Vladimir V. Galvita. "Approaches for Selective Oxidation of Methane to Methanol." Catalysts 10, no. 2 (February 6, 2020): 194. http://dx.doi.org/10.3390/catal10020194.

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Анотація:
Methane activation chemistry, despite being widely reported in literature, remains to date a subject of debate. The challenges in this reaction are not limited to methane activation but extend to stabilization of the intermediate species. The low C-H dissociation energy of intermediates vs. reactants leads to CO2 formation. For selective oxidation, nature presents methane monooxygenase as a benchmark. This enzyme selectively consumes methane by breaking it down into methanol. To assemble an active site similar to monooxygenase, the literature reports Cu-ZSM-5, Fe-ZSM-5, and Cu-MOR, using zeolites and systems like CeO2/Cu2O/Cu. However, the trade-off between methane activation and methanol selectivity remains a challenge. Density functional theory (DFT) calculations and spectroscopic studies indicate catalyst reducibility, oxygen mobility, and water as co-feed as primary factors that can assist in enabling higher selectivity. The use of chemical looping can further improve selectivity. However, in all systems, improvements in productivity per cycle are required in order to meet the economical/industrial standards.
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2

Schwarz, Helmut. "Activation of Methane." Angewandte Chemie International Edition in English 30, no. 7 (July 1991): 820–21. http://dx.doi.org/10.1002/anie.199108201.

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3

Choudhary, Tushar V., Erhan Aksoylu, and D. Wayne Goodman. "Nonoxidative Activation of Methane." Catalysis Reviews 45, no. 1 (January 5, 2003): 151–203. http://dx.doi.org/10.1081/cr-120017010.

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4

Sherry, Alan E., and Bradford B. Wayland. "Metalloradical activation of methane." Journal of the American Chemical Society 112, no. 3 (January 1990): 1259–61. http://dx.doi.org/10.1021/ja00159a064.

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5

Yu, Yue, Zhixiang Xi, Bingjie Zhou, Binbo Jiang, Zuwei Liao, Yao Yang, Jingdai Wang, Zhengliang Huang, Jingyuan Sun, and Yongrong Yang. "Enhancing Methane Conversion by Modification of Zn States in Co-Reaction of MTA." Catalysts 11, no. 12 (December 17, 2021): 1540. http://dx.doi.org/10.3390/catal11121540.

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Анотація:
Limited by harsh reaction conditions, the activation and utilization of methane were regarded as holy grail reaction. Co-reaction with methanol, successfully realizing mild conversion below 450 °C, provides practical strategies for methane conversion on metal-loaded ZSM-5 zeolites, especially for highly efficient Zn loaded ones. However, Zn species, regarded as active acid sites on the zeolite, have not been sufficiently studied. In this paper, Zn-loaded ZSM-5 zeolite was prepared, and Zn was modified by capacity, loading strategy, and treating atmosphere. Apparent methane conversion achieves 15.3% for 1.0Zn/Z-H2 (16.8% as calculated net conversion) with a significantly reduced loading of 1.0 wt.% against deactivation, which is among the best within related zeolite materials. Besides, compared to the MTA reaction, the addition of methane promotes the high-valued aromatic production from 49.4% to 54.8%, and inhibits the C10+ production from 7.8% to 3.6%. Notably, Zn2+ is found to be another active site different from the reported ZnOH+. Medium strong acid sites are proved to be beneficial for methane activation. This work provides suggestions for the modification of the Zn active site, in order to prepare highly efficient catalysts for methane activation and BTX production in co-reaction with methanol.
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6

Baerns, M. "Workshop on basic research opportunities in methane activation chemistry." Applied Catalysis 18, no. 1 (September 1985): 211–12. http://dx.doi.org/10.1016/s0166-9834(00)80330-9.

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7

Meyet, Jordan, Mark A. Newton, Jeroen A. van Bokhoven, and Christophe Copéret. "Molecular Approach to Generate Cu(II) Sites on Silica for the Selective Partial Oxidation of Methane." CHIMIA International Journal for Chemistry 74, no. 4 (April 29, 2020): 237–40. http://dx.doi.org/10.2533/chimia.2020.237.

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Анотація:
The selective partial oxidation of methane to methanol remains a great challenge in the field of catalysis. Cu-exchanged zeolites are promising materials, directly and selectively converting methane to methanol with high yield under cyclic conditions. However, the economic viability of these aluminosilicate materials for potential industrial applications remains a challenge. Exploring copper supported on non-microporous oxide supports and rationalising the structure/reactivity relationships extends the scope of material investigation and opens new possibilities. Recently, copper on alumina was demonstrated to be active and selective for the partial oxidation of methane. This work aims to explore the formation of well-defined Cu(II) oxo species on silica via surface organometallic chemistry and examines their reactivity for the selective transformation of methane to methanol. Isolated Cu(II) sites were generated via grafting of a tailored molecular precursor. Activation under oxidative conditions and subsequent removal of organic moieties from the grafted copper centres led to the formation of small copper (II) oxide clusters, which are active in the partial oxidation of methane under mild conditions, albeit significantly less efficient than the corresponding isolated Cu(II) sites on alumina.
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8

Butschke, Burkhard, Maria Schlangen, Helmut Schwarz, and Detlef Schröder. "C–H Bond Activation ofMethane with Gaseous [(CH3)Pt(L)]+ Complexes (L = Pyridine, Bipyridine, and Phenanthroline)." Zeitschrift für Naturforschung B 62, no. 3 (March 1, 2007): 309–13. http://dx.doi.org/10.1515/znb-2007-0302.

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Анотація:
Electrospray ionization of solutions of dimethyl(1,5-cyclooctadiene)platinum(II) in methanol with traces of nitrogen-containing ligands L provides gaseous complexes of the type [(CH3)Pt(L)]+ with L = pyridine (py), 2,2′-bipyridine (bipy), and 1,10-phenanthroline (phen). These [(CH3)Pt(L)]+ cations are capable of activating the C-H bond in methane as shown by H/D exchange when using CD4 as a neutral reactant. Most reactive is the complex [(CH3)Pt(py)]+ bearing a monodentate nitrogen ligand. The cationic complexes [(CH3)Pt(bipy)]+ and [(CH3)Pt(phen)]+ also bring about activation of methane, though at a lower rate, whereas the bipyridine complex [(CH3)Pt(py)2]+ does not react with methane at thermal conditions. A detailed analysis of the experimental data by means of kinetic modeling provides insight into the underlying mechanistic steps, but a distinction whether the reaction occurs as σ bond metathesis or via an oxidative addition cannot be made on the basis of the experimental data available.
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9

Tian, Yudong, Lingyu Piao, and Xiaobo Chen. "Research progress on the photocatalytic activation of methane to methanol." Green Chemistry 23, no. 10 (2021): 3526–41. http://dx.doi.org/10.1039/d1gc00658d.

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This review presents the recent progress of the photocatalytic conversion of CH4 to CH3OH from four aspects: photocatalysts, oxidants, sacrificial reagents, and CH4 activation mechanisms, along with its current status and existing challenges.
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10

Cui, Weihong, X. Peter Zhang, and Bradford B. Wayland. "Bimetallo-Radical Carbon−Hydrogen Bond Activation of Methanol and Methane." Journal of the American Chemical Society 125, no. 17 (April 2003): 4994–95. http://dx.doi.org/10.1021/ja034494m.

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11

Liu, Yizhen, Weishi Dong, Zhen Hua Li, and Huadong Wang. "Methane activation by a borenium complex." Chem 7, no. 7 (July 2021): 1843–51. http://dx.doi.org/10.1016/j.chempr.2021.03.010.

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12

Trevor, D. J., D. M. Cox, and A. Kaldor. "Methane activation on unsupported platinum clusters." Journal of the American Chemical Society 112, no. 10 (May 1990): 3742–49. http://dx.doi.org/10.1021/ja00166a005.

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13

Huo, Shangfei, Rongliang Wu, Minhao Li, Hong Chen, and Weiwei Zuo. "Methane Activation with N-Haloimides." Industrial & Engineering Chemistry Research 59, no. 52 (December 17, 2020): 22690–95. http://dx.doi.org/10.1021/acs.iecr.0c05972.

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14

van Koppen, Petra A. M., Jason K. Perry, Paul R. Kemper, John E. Bushnell, and Michael T. Bowersab. "Activation of methane by Ti+:." International Journal of Mass Spectrometry 185-187 (April 1999): 989–1001. http://dx.doi.org/10.1016/s1387-3806(98)14269-0.

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15

Niu, Tianchao, Zhao Jiang, Yaguang Zhu, Guangwen Zhou, Matthijs A. van Spronsen, Samuel A. Tenney, J. Anibal Boscoboinik, and Dario Stacchiola. "Oxygen-Promoted Methane Activation on Copper." Journal of Physical Chemistry B 122, no. 2 (November 16, 2017): 855–63. http://dx.doi.org/10.1021/acs.jpcb.7b06956.

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16

Langfeld, Kirsten, René Marschner, Benjamin Frank, and Reinhard Schomäcker. "Methane Activation over Cellulose Templated Perovskite Catalysts." ChemCatChem 3, no. 8 (May 10, 2011): 1354–58. http://dx.doi.org/10.1002/cctc.201100033.

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17

Schröder, Detlef, and Helmut Schwarz. "Activation of methane by gaseous platinum(II) ions PtX+ (X = H, Cl, Br, CHO)." Canadian Journal of Chemistry 83, no. 11 (November 1, 2005): 1936–40. http://dx.doi.org/10.1139/v05-217.

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Анотація:
The gas-phase reactions of methane with the platinum(II) ions PtX+ with X = H, Cl, Br, and CHO are studied by mass spectrometry. The PtX+ ions are generated by electrospray ionization of methanolic solutions of hexachloroplatinic acid and hexabromoplatinic acid, respectively. Small to moderate intramolecular kinetic isotope effects determined for the C—H(D) bond activation of CH2D2 suggest that the activation of methane by gaseous PtX+ cations is subject to thermochemical control by the product channels. In addition, the PtCl2+ cation is also able to activate methane, whereas PtCl3+ is unreactive under the conditions chosen. Key words: gas-phase reactions, mass spectrometry, methane activation, platinum bromide, platinum chloride.
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18

Goeppert, Alain, Peter Dinér, Per Ahlberg, and Jean Sommer. "Methane Activation and Oxidation in Sulfuric Acid." Chemistry - A European Journal 8, no. 14 (July 15, 2002): 3277. http://dx.doi.org/10.1002/1521-3765(20020715)8:14<3277::aid-chem3277>3.0.co;2-5.

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19

Meng, Jing-Heng, Xiao-Jiao Deng, Zi-Yu Li, Sheng-Gui He, and Wei-Jun Zheng. "Thermal Methane Activation by La6O10−Cluster Anions." Chemistry - A European Journal 20, no. 19 (April 15, 2014): 5580–83. http://dx.doi.org/10.1002/chem.201400218.

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20

Li, Zi-Yu, Zhen Yuan, Yan-Xia Zhao, and Sheng-Gui He. "Methane Activation by Diatomic Molybdenum Carbide Cations." Chemistry - A European Journal 20, no. 14 (February 25, 2014): 4163–69. http://dx.doi.org/10.1002/chem.201304042.

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21

Campbell, K. D., H. Zhang, and J. H. Lunsford. "Methane activation by the lanthanide oxides." Journal of Physical Chemistry 92, no. 3 (February 1988): 750–53. http://dx.doi.org/10.1021/j100314a032.

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22

Carter, Carly C., and Thomas R. Cundari. "Computational Study of Methane C–H Activation by Main Group and Mixed Main Group–Transition Metal Complexes." Molecules 25, no. 12 (June 17, 2020): 2794. http://dx.doi.org/10.3390/molecules25122794.

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Анотація:
In the present density functional theory (DFT) research, nine different molecules, each with different combinations of A (triel) and E (divalent metal) elements, were reacted to effect methane C–H activation. The compounds modeled herein incorporated the triels A = B, Al, or Ga and the divalent metals E = Be, Mg, or Zn. The results show that changes in the divalent metal have a much bigger impact on the thermodynamics and methane activation barriers than changes in the triels. The activating molecules that contained beryllium were most likely to have the potential for activating methane, as their free energies of reaction and free energy barriers were close to reasonable experimental values (i.e., ΔG close to thermoneutral, ΔG‡ ~30 kcal/mol). In contrast, the molecules that contained larger elements such as Zn and Ga had much higher ΔG‡. The addition of various substituents to the A–E complexes did not seem to affect thermodynamics but had some effect on the kinetics when substituted closer to the active site.
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23

Kummerlöwe, Grit, Iulia Balteanu, Zheng Sun, O. Petru Balaj, Vladimir E. Bondybey, and Martin K. Beyer. "Activation of methane and methane-d4 by ionic platinum clusters." International Journal of Mass Spectrometry 254, no. 3 (August 2006): 183–88. http://dx.doi.org/10.1016/j.ijms.2006.06.003.

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24

Aljama, Hassan, Jens K. Nørskov, and Frank Abild-Pedersen. "Tuning Methane Activation Chemistry on Alkaline Earth Metal Oxides by Doping." Journal of Physical Chemistry C 122, no. 39 (September 7, 2018): 22544–48. http://dx.doi.org/10.1021/acs.jpcc.8b06682.

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25

Que,, Lawrence, and Yanhong Dong. "Modeling the Oxygen Activation Chemistry of Methane Monooxygenase and Ribonucleotide Reductase." Accounts of Chemical Research 29, no. 4 (January 1996): 190–96. http://dx.doi.org/10.1021/ar950146g.

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26

Kazunari, Yoshizawa. "Studies of Orbital Principle for Methane Activation Using Computational Quantum Chemistry." Bulletin of Japan Society of Coordination Chemistry 75 (May 31, 2020): 57–65. http://dx.doi.org/10.4019/bjscc.75.57.

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27

Schröder, Detlef. "Activation of Methane by Gaseous Metal Ions." Angewandte Chemie International Edition 49, no. 5 (January 13, 2010): 850–51. http://dx.doi.org/10.1002/anie.200906518.

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28

Feyel, Sandra, Jens Döbler, Detlef Schröder, Joachim Sauer, and Helmut Schwarz. "Thermal Activation of Methane by Tetranuclear [V4O10]+." Angewandte Chemie International Edition 45, no. 28 (July 10, 2006): 4681–85. http://dx.doi.org/10.1002/anie.200600188.

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29

Cundari, Thomas R. "Methane activation by Group IVB imido complexes." Journal of the American Chemical Society 114, no. 26 (December 1992): 10557–63. http://dx.doi.org/10.1021/ja00052a060.

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30

Gupta, Drishti, and Thomas R. Cundari. "Group 13 complexes for methane activation." Computational and Theoretical Chemistry 1214 (August 2022): 113788. http://dx.doi.org/10.1016/j.comptc.2022.113788.

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31

Jun, Li, Zhao Ling, and Lu Guanzhong. "Activation of Methane over Perovskite Catalysts." Industrial & Engineering Chemistry Research 48, no. 2 (January 21, 2009): 641–46. http://dx.doi.org/10.1021/ie8008007.

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32

Zhao, Yan-Xia, Zi-Yu Li, Yuan Yang, and Sheng-Gui He. "Methane Activation by Gas Phase Atomic Clusters." Accounts of Chemical Research 51, no. 11 (October 5, 2018): 2603–10. http://dx.doi.org/10.1021/acs.accounts.8b00403.

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33

Meyer, Dirk, and Thomas Strassner. "CH-activation of methane – Synthesis of an intermediate?" Journal of Organometallic Chemistry 784 (May 2015): 84–87. http://dx.doi.org/10.1016/j.jorganchem.2014.09.022.

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34

Cundari, Thomas R. "Methane Activation by Group VB Bis(imido) Complexes." Organometallics 13, no. 8 (August 1994): 2987–94. http://dx.doi.org/10.1021/om00020a014.

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35

Tang, Pei, Qingjun Zhu, Zhaoxuan Wu, and Ding Ma. "Methane activation: the past and future." Energy Environ. Sci. 7, no. 8 (2014): 2580–91. http://dx.doi.org/10.1039/c4ee00604f.

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36

Morris, Robert H. "Methane activation by a single copper center in particulate methane monooxygenase: A computational study." Inorganica Chimica Acta 503 (April 2020): 119441. http://dx.doi.org/10.1016/j.ica.2020.119441.

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37

Xi, Yongjie, and Andreas Heyden. "Selective activation of methane C H bond in the presence of methanol." Journal of Catalysis 386 (June 2020): 12–18. http://dx.doi.org/10.1016/j.jcat.2020.03.036.

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38

Chen, Yu-Min, and P. B. Armentrout. "Activation of Methane by Gas-Phase Rh+." Journal of Physical Chemistry 99, no. 27 (July 1995): 10775–79. http://dx.doi.org/10.1021/j100027a016.

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39

Tabata, K., Y. Teng, T. Takemoto, E. Suzuki, M. A. Bañares, M. A. Peña, and J. L. G. Fierro. "Activation of methane by oxygen and nitrogen oxides." Catalysis Reviews 44, no. 1 (August 4, 2002): 1–58. http://dx.doi.org/10.1081/cr-120001458.

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40

DuChane, Christine M., and Jiawei Chen. "Harnessing the reactivity of borenium for methane activation." Chem 7, no. 7 (July 2021): 1691–93. http://dx.doi.org/10.1016/j.chempr.2021.06.016.

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41

Campbell, Robert A., J�nos Szanyi, Petra Lenz, and D. Wayne Goodman. "Methane activation on clean and oxidized Ni(100)." Catalysis Letters 17, no. 1-2 (1993): 39–46. http://dx.doi.org/10.1007/bf00763925.

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42

Claridge, J. B., M. L. H. Green, R. M. Lago, S. C. Tsang, and A. P. E. York. "Redox properties of molten salts for methane activation." Catalysis Letters 21, no. 1-2 (1993): 123–31. http://dx.doi.org/10.1007/bf00767377.

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43

Gherman, Benjamin F., Mu-Hyun Baik, Stephen J. Lippard, and Richard A. Friesner. "Dioxygen Activation in Methane Monooxygenase: A Theoretical Study." Journal of the American Chemical Society 126, no. 9 (March 2004): 2978–90. http://dx.doi.org/10.1021/ja036506+.

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44

Liu, Shaoli, Jianbo Cheng, Qingzhong Li, and Wenzuo Li. "Gas-phase activation of methane with PtOH+." Computational and Theoretical Chemistry 1145 (December 2018): 54–59. http://dx.doi.org/10.1016/j.comptc.2018.11.004.

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45

MU, Xiaoyue, and Lu LI. "Photo-Induced Activation of Methane at Room Temperature." Acta Physico-Chimica Sinica 35, no. 9 (2019): 968–76. http://dx.doi.org/10.3866/pku.whxb201810007.

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46

Gonzales, Jason M., Jonas Oxgaard, Roy A. Periana, and William A. Goddard. "Methane Activation with Rhenium Catalysts. 1. Bidentate Oxygenated Ligands." Organometallics 26, no. 6 (March 2007): 1505–11. http://dx.doi.org/10.1021/om0606901.

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47

Tang, Yu, Yuting Li, and Franklin (Feng) Tao. "Activation and catalytic transformation of methane under mild conditions." Chemical Society Reviews 51, no. 1 (2022): 376–423. http://dx.doi.org/10.1039/d1cs00783a.

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Анотація:
In the last few decades, scientists have been motivated by promising production of chemicals from methane under mild conditions for low energy consumption and climate remediation; significant fundamental understanding on this topic has been achieved.
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48

Bhati, Meema, Jignesh Dhumal, and Kavita Joshi. "Lowering the C–H bond activation barrier of methane by means of SAC@Cu(111): periodic DFT investigations." New Journal of Chemistry 46, no. 1 (2022): 70–74. http://dx.doi.org/10.1039/d1nj04525c.

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Анотація:
Methane has long been in the world's spotlight as the simplest yet one of the most notorious hydrocarbons; here, we study the efficiency of single-atom catalysts (SACs) for methane activation using density functional theory (DFT).
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49

Liu, Zizhuang, Hechen Wu, Wei Li, and Xiaonan Wu. "The Reactive Sites of Methane Activation: A Comparison of IrC3+ with PtC3+." Molecules 26, no. 19 (October 4, 2021): 6028. http://dx.doi.org/10.3390/molecules26196028.

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Анотація:
The activation reactions of methane mediated by metal carbide ions MC3+ (M = Ir and Pt) were comparatively studied at room temperature using the techniques of mass spectrometry in conjunction with theoretical calculations. MC3+ (M = Ir and Pt) ions reacted with CH4 at room temperature forming MC2H2+/C2H2 and MC4H2+/H2 as the major products for both systems. Besides that, PtC3+ could abstract a hydrogen atom from CH4 to generate PtC3H+/CH3, while IrC3+ could not. Quantum chemical calculations showed that the MC3+ (M = Ir and Pt) ions have a linear M-C-C-C structure. The first C–H activation took place on the Ir atom for IrC3+. The terminal carbon atom was the reactive site for the first C–H bond activation of PtC3+, which was beneficial to generate PtC3H+/CH3. The orbitals of the different metal influence the selection of the reactive sites for methane activation, which results in the different reaction channels. This study investigates the molecular-level mechanisms of the reactive sites of methane activation.
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50

Hibino, Takashi, Satoshi Hamakawa, and Hiroyasu Iwahara. "Electrochemical Methane Activation to C2-Hydrocarbons Using Protonic Conductor." Chemistry Letters 21, no. 9 (September 1992): 1715–16. http://dx.doi.org/10.1246/cl.1992.1715.

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