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1. Selective Levulinic Acid Hydrogenation in Presence of Hybrid Dendrimer‐Based Catalysts. Part II: Bimetallic.

Author

Maximov, Anton L., Zolotukhina, Anna V., Mamedli, Adela A., Tairova, Sabina, and Karakanov, Edward A.

Subjects
*BIMETALLIC catalysts, *CATALYST selectivity, *HYBRID materials, *PHOTOELECTRON spectroscopy, *TRANSMISSION electron microscopy
Abstract

Various heterogeneous bimetallic Ru, Rh, Pd and/or Cu‐containing catalysts, based on dendrimer‐silica mesoporous hybrid supports, are successfully synthesized, using co‐complexation method, and characterized by transmission electron microscopy and X‐ray photoelectron spectroscopy. The catalysts obtained are examined in the aqueous hydrogenation of levulinic acid and its esters to γ‐valerolactone. The catalyst activity and selectivity on γ‐valerolactone are strongly dependent on the nature and ratio of metal used, and PdRu bimetallic catalysts are found to be the most effective. Quantitative or near to quantitative yields of γ‐valerolactone can be achieved for all PdRu catalysts and substrates tested within 2 hours, with maximum TOF value of 4500 h−1. Such high efficiency is provided by especial nanoparticle structure, consisted of Pd core and RuPd shell, and synergistic effect between Ru and Pd in alloy. [ABSTRACT FROM AUTHOR]

Published
2024
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2. The green chemistry paradigm in modern organic synthesis

Author

Zlotin, Sergei Grigorievich, primary, Egorova, Ksenia Sergeevna, additional, Ananikov, Valentine Pavlovich, additional, Akulov, Alexey Alexandrovich, additional, Varaksin, Mikhail Viktorovich, additional, Chupakhin, Oleg Nikolaevich, additional, Charushin, Valery Nikolaevich, additional, Bryliakov, Konstantin Petrovich, additional, Averin, Alexei Dmitrievich, additional, Beletskaya, Irina Petrovna, additional, Dolengovski, Egor L'vovich, additional, Budnikova, Yulia Hermanovna, additional, Sinyashin, Oleg Gerol'dovich, additional, Gafurov, Zufar Nafigullovich, additional, Kantyukov, Artem Olegovich, additional, Yakhvarov, Dmitry Grigorievich, additional, Aksenov, Alexander Viktorovich, additional, Elinson, Michail Nikolaevich, additional, Nenajdenko, Valentine Georgievich, additional, Chibiryaev, Andrey Mikhailovich, additional, Nesterov, Nikolay Sergeevich, additional, Kozlova, Ekaterina Aleksandrovna, additional, Martyanov, Oleg Nikolaevich, additional, Balova, Irina Anatol'evna, additional, Sorokoumov, Viktor Nikolaevich, additional, Guk, Dmitry Alexandrovich, additional, Beloglazkina, Elena Kimovna, additional, Lemenovskii, Dmitrii Anatol'evich, additional, Chukicheva, Irina Yurievna, additional, Frolova, Larisa Leonidovna, additional, Izmest'ev, Evgeniy Sergeevich, additional, Dvornikova, Irina Aleksandrovna, additional, Popov, Alexey Vladimirovich, additional, Kutchin, Aleksandr Vasilevich, additional, Borisova, Diana Maksimovna, additional, Kalinina, Aleksandra Aleksandrovna, additional, Muzafarov, Aziz Mansurovich, additional, Kuchurov, Ilya Vladimirovich, additional, Maximov, Anton Lvovich, additional, and Zolotukhina, Anna Vladimirovna, additional

Published
2023
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4. Synthesis and Investigation of Zeolite TiO2/Al-ZSM-12 Structure and Properties

Author

Tsaplin, Dmitry E., primary, Ostroumova, Vera A., additional, Kulikov, Leonid A., additional, Zolotukhina, Anna V., additional, Sadovnikov, Alexey A., additional, Kryuchkov, Michail D., additional, Egazaryants, Sergey V., additional, Maksimov, Anton L., additional, Wang, Kaige, additional, Luo, Zhongyang, additional, and Naranov, Evgeny R., additional

Published
2023
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8. Synthesis and Investigation of Zeolite TiO 2 /Al-ZSM-12 Structure and Properties.

Author

Tsaplin, Dmitry E., Ostroumova, Vera A., Kulikov, Leonid A., Zolotukhina, Anna V., Sadovnikov, Alexey A., Kryuchkov, Michail D., Egazaryants, Sergey V., Maksimov, Anton L., Wang, Kaige, Luo, Zhongyang, and Naranov, Evgeny R.

Subjects
TITANIUM dioxide, NUCLEAR magnetic resonance spectroscopy, RAMAN spectroscopy, OXIDIZING agents, CATALYTIC activity, ZEOLITES, GENTIAN violet
Abstract

The textural, structural, morphological, and acidic properties of TiO2/Al-ZSM-12 zeolite synthesized viathe hydrothermal method and using methyltriethylammonium chloride as a template were studied in this study. The structure, size, and shape of the crystallites, and the acidity of the synthesized materials were investigated in detail using the following methods: XRD, low-temperature nitrogen adsorption–desorption, XRF, FTIR, Raman spectroscopy, DRS UV–Vis, DRIFTS, PL, SEM, TEM, solid-state NMR spectroscopy on 27Al, 1H, 29Si, 1H-29Si and 23Na nuclei, NH3-TPD, TG, DSC, DTA, FTIR-Py, FTIR-2,6-dTBP, FTIR-CD3CN, and DRIFTS-acid. The presence of tetrahedral titanium in the TiO2/Al-ZSM-12 zeolite was confirmed by Raman spectroscopy, DRIFT, and 29Si NMR. It was revealed that the crystallites of the TiO2/Al-ZSM-12 zeolite, elongated along the b axis, had a higher acidity compared to the unsubstituted zeolite Al-ZSM-12. The oxidative catalytic activity of the TiO2/Al-ZSM-12 zeolite was studied in the photoinduced decomposition of the crystal violet dye and it was found that the reaction proceeds most efficiently in the presence of H2O2 as an oxidizing agent and TiO2/Al-ZSM-12 as a catalyst (PCA = 0.157%∙min−1). [ABSTRACT FROM AUTHOR]

Published
2023
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11. Functional supramolecular systems: design and applications

Author

Antipin, Igor S., primary, Alfimov, Mikhail V., additional, Arslanov, Vladimir V., additional, Burilov, Vladimir A., additional, Vatsadze, Sergey Z., additional, Voloshin, Yan Z., additional, Volcho, Konstantin P., additional, Gorbatchuk, Valery V., additional, Gorbunova, Yulia G., additional, Gromov, Sergey P., additional, Dudkin, Semyon V., additional, Zaitsev, Sergei Yu., additional, Zakharova, Lucia Ya., additional, Ziganshin, Marat A., additional, Zolotukhina, Anna V., additional, Kalinina, Maria A., additional, Karakhanov, Eduard A., additional, Kashapov, Ruslan R., additional, Koifman, Oskar I., additional, Konovalov, Alexander I., additional, Korenev, Vladimir S., additional, Maksimov, Anton L., additional, Mamardashvili, Nugzar Zh., additional, Mamardashvili, Galina M., additional, Martynov, Alexander G., additional, Mustafina, Asiya R., additional, Nugmanov, Ramil I., additional, Ovsyannikov, Alexander S., additional, Padnya, Pavel L., additional, Potapov, Andrei S., additional, Selektor, Sofiya L., additional, Sokolov, Maxim N., additional, Solovieva, Svetlana E., additional, Stoikov, Ivan I., additional, Stuzhin, Pavel A., additional, Suslov, Evgenii V., additional, Ushakov, Evgeny N., additional, Fedin, Vladimir P., additional, Fedorenko, Svetlana V., additional, Fedorova, Olga A., additional, Fedorov, Yury V., additional, Chvalun, Sergei N., additional, Tsivadze, Aslan Yu., additional, Shtykov, Sergei N., additional, Shurpik, Dmitriy N., additional, Shcherbina, Maxim A., additional, and Yakimova, Luidmila S., additional

Published
2021
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16. Mesoporous Metal Catalysts Templated on Clay Nanotubes

Author

Glotov, Aleksandr, primary, Stavitskaya, Anna, additional, Chudakov, Yaroslav, additional, Ivanov, Evgenii, additional, Huang, Wei, additional, Vinokurov, Vladimir, additional, Zolotukhina, Anna, additional, Maximov, Anton, additional, Karakhanov, Eduard, additional, and Lvov, Yuri, additional

Published
2019
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29. Selective Levulinic Acid Hydrogenation in the Presence of Hybrid Dendrimer‐Based Catalysts. Part I: Monometallic.

Author

Maximov, Anton L., Zolotukhina, Anna V., Mamedli, Adila A., Kulikov, Leonid A., and Karakhanov, Edward A.

Subjects
*POLYPROPYLENE, *DENDRIMERS, *MACROMOLECULES, *TRANSMISSION electron microscopy, *PHOTOELECTRON spectroscopy
Abstract

Abstract: Hybrid Ru‐containing catalysts, based on poly(propylene imine) (PPI) dendrimers, immobilized in silica pores, were synthesized and characterized by transmission electron microscopy and X‐ray photoelectron spectroscopy. The synthesized Ru catalysts proved their efficiency in the selective hydrogenation of levulinic acid and its esters at 80 °C, 30 bar of H2, and 50 % volume substrate concentration in water. Quantitative yields of γ‐valerolactone were obtained for both micro‐ and mesoporous Ru catalysts within 2 h with catalytic activity as high as 1610 h−1. The reaction rate and selectivity on γ‐valerolactone were found to depend on several factors such as carrier structure, temperature, presence of water, and substrate/Ru ratio. The novelty of these hybrid materials is the presence of both weak acid (SiO2) and organic base centers (dendrimer amino groups), enhancing the dispersion of Ru nanoparticles. The presence of amino groups in the catalyst stabilizes the Ru nanoparticles during the synthesis and promotes the adsorption of levulinic acid on the surface of Ru nanoparticles during the reaction. Synthesized hybrid Ru catalysts can be reused several times without significant loss of activity. [ABSTRACT FROM AUTHOR]

Published
2018
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34. Alkyne.

Author

Karakhanov, Edward A., Maximov, Anton L., Zolotukhina, Anna V., Yatmanova, Nadezhda, and Rosenberg, Edward

Subjects
ALKYNES, PROPENE, DENDRIMERS, SILICA, CATALYSTS
Abstract

A series of Pd-Ag mixed-metal nanocatalysts were prepared by reduction of Pd-Ag salts in the presence of poly(propylene imine) dendrimers, which were covalently bound to the surface of a silica polyamine composite, BP-1 (polyallylamine covalently bound to a silanized amorphous silica gel). Three different Pd-to-Ag ratios were evaluated (50:50, catalyst 1; 40:60, catalyst 2; 60:40, catalyst 3) with the goal of determining how the amount of Ag effects selectivity, rate and conversion in the selective , such as phenylacetylene and 1- or 4-octyne, to the corresponding alkenes. Conditions for the are reported where there is improved selectivity without a serious reduction in rate when compared with the analogous Pd-only catalysts. Catalyst 2 worked best for phenylacetylene and catalyst 3 worked best for the octynes. The catalysts could be reused seven times without loss of activity. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2015
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37. Nanocatalysts based on dendrimers

Author

Karakhanov, Edward A., primary, Maximov, Anton L., additional, Skorkin, Vitaliy A., additional, Zolotukhina, Anna V., additional, Smerdov, Alexey S., additional, and Tereshchenko, Andrey Yu., additional

Published
2009
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38. Manganese and Cobalt Doped Hierarchical Mesoporous Halloysite-Based Catalysts for Selective Oxidation of p-Xylene to Terephthalic Acid.

Author

Karakhanov, Eduard, Maximov, Anton, Zolotukhina, Anna, Vinokurov, Vladimir, Ivanov, Evgenii, and Glotov, Aleksandr

Subjects
TEREPHTHALIC acid, HALLOYSITE, P-Xylene, BIMETALLIC catalysts, OXIDATION, CATALYSTS
Abstract

Bimetallic MnCo catalyst, supported on the mesoporous hierarchical MCM-41/halloysite nanotube composite, was synthesized for the first time and proved its efficacy in the selective oxidation of p-xylene to terephthalic acid under conditions of the AMOCO process. Quantitative yields of terephthalic acid were achieved within 3 h at 200–250 °C, 20 atm. of O2 and at a substrate to the Mn + Co ratio of 4–4.5 times higher than for traditional homogeneous system. The influence of temperature, oxygen, pressure and KBr addition on the catalyst activity was investigated, and the mechanism for the oxidation of p-toluic acid to terephthalic acid, excluding undesirable 4-carboxybenzaldehyde, was proposed. [ABSTRACT FROM AUTHOR]

Published
2020
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