Conversion of ethanol and glycerol to olefins over the Re- and W-containing catalysts

Zharova, P. A.; Chistyakov, A. V.; Zavelev, D. E.; Kriventsov, V. V.; Yakimchuk, E. P.; Kryzhovets, O. S.; Petrakova, O. V.; Дробот, Д. В.; Цодиков, М. В.

doi:10.1007/s11172-015-0865-y

Cited by 6 publications

(4 citation statements)

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“…It was demonstrated [26] by 29 Al NMR spectros copy that Pt 4+ ions supported on the γ Al 2 O 3 surface are selectively chemisorbed by ("stick" to) pentacoor dinated Al 3+ ions [25].…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the mecha nism of hydrocarbon chain propagation is catalyst dependent. In the presence of zeolite based catalytic systems, chain propagation takes place via the so called hydrocarbon pool mechanism, which leads mainly to the formation of aromatic hydrocarbons [25,26]. In ethanol conversion over the WO 3 -Re 2 O 7 /Al 2 O 3 cata lytic system, the basic chain propagation step is aldol condensation [4,25].…”

Section: Discussionmentioning

confidence: 99%

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Mechanism of the reductive dehydration of ethanol into C3+ alkanes over the commercial alumina—platinum catalyst AP-64

et al. 2016

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The mechanism of the reductive dehydration of ethanol (RDE) into C 3+ alkanes over the com mercial alumina-platinum catalyst AP 64 has been investigated. The catalyst pre reduction time has an effect on the conversion of ethanol and on that of ethylene, a possible intermediate compound in the RDE reaction. Over the catalyst reduced for 12 h, ethanol turns into a C 3 -C 12 alkane fraction and ethylene turns into a C 3 -C 12 olefin fraction, whose yields are 39.0 and 31.4%, respectively. Energetic parameters of ethanol chemisorption and conversion on a Pt 6 Al 4 cluster have been determined by the density functional theory method using the PRIRODA 13 program. Ethanol dehydration into ethylene proceeds via the successive break ing of C-H and C-O bonds, and the rate determining step of the process depends on the atom (Pt or Al) to which the OH group of the alcohol is coordinated. Hydroxyl group transfer from the Pt atom to the nearest Al atom is energetically favorable here. It is hypothesized that the main role of the metal containing cluster is donation of chemisorbed ethylene to the nearest acid sites, on which the ethylene oligomerizes into a C 3 -C 10 hydrocarbon fraction.

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“…It was demonstrated [26] by 29 Al NMR spectros copy that Pt 4+ ions supported on the γ Al 2 O 3 surface are selectively chemisorbed by ("stick" to) pentacoor dinated Al 3+ ions [25].…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Mechanism of the reductive dehydration of ethanol into C3+ alkanes over the commercial alumina—platinum catalyst AP-64

et al. 2016

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“…By analyzing the variation in curves of the quantity of internal Ag atoms and surface Ni atoms, Baletto et al were able to quantitatively characterize the quality of the Ni–Ag core–shell structure formed during deposition. A great deal of study has been done on the surface segregation of various bimetallic nanoclusters by Wang and Eom et al , W has garnered considerable interest as a catalyst material that enhances production efficiency , and can be widely applied in the field of new energy (nuclear energy). , Re is another substance that has the catalytic potential, − and the combination product Re–W has outstanding catalytic qualities. − Their study is sufficient to demonstrate the excellent catalytic performance of the Re–W alloys. It is well-known that increasing the contact area can improve the catalytic efficiency and the preparation of catalysts into tiny particles is a good way to increase the contact area.…”

Section: Introductionmentioning

confidence: 99%

Atomistic Simulations of Diffusion and Structural Transformation of Re on W Nanoclusters: Implications for Re–W Catalysts

Xi,

Dai,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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Bimetallic nanoclusters have a wide range of uses, and Re−W has been shown to be a catalyst due to its good properties, so it is crucial to study Re−W nanoclusters at the microscopic scale in order to obtain better-performing Re−W nanoclusters. This research investigates the diffusion and structural modification of Re on the surfaces of W nanoclusters at high temperatures. The EAM potential function is employed in this work to explain the interaction between Re and W, and the LAMMPS (large-scale atom/polar massively parallel simulation) package is used for the simulation. We observed the diffusion phenomenon in our investigation by depositing Re atoms on the surface of the W nanoclusters. The findings demonstrate that there are differences in the exchange energy barriers between the Re and W atoms at various locations. At the intersection of the faces, the more (110) faces there are, the lower the exchange energy barrier between the Re and W atoms. During diffusion, the mechanisms of vacancy formation and migration were investigated. The results of the analysis demonstrate that the formation and migration of these vacancies are facilitated by the presence of Re atoms. Furthermore, we noticed that the lattice structure changed throughout the entire deposition process. This observation offers a theoretical direction for producing Re−W bimetallic nanoclusters with a little lattice distortion.

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“…Эти результаты позволили создать методы получения сплавов тугоплавких металлов (T пл. > 2500 °С) при рекордно низких температурах (< 600 °С), катализаторов, позволяющих получать из биомассы моторные топлива или присадки к ним [7][8][9].…”

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Dvi-manganese - Rhenium is the youngest stable element of the Periodic Table

Дробот

Буданова

2020

Fine Chem. Tech.

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Conversion of ethanol and glycerol to olefins over the Re- and W-containing catalysts

Cited by 6 publications

References 6 publications

Mechanism of the reductive dehydration of ethanol into C3+ alkanes over the commercial alumina—platinum catalyst AP-64

Mechanism of the reductive dehydration of ethanol into C3+ alkanes over the commercial alumina—platinum catalyst AP-64

Atomistic Simulations of Diffusion and Structural Transformation of Re on W Nanoclusters: Implications for Re–W Catalysts

Dvi-manganese - Rhenium is the youngest stable element of the Periodic Table

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