Cyclohexane dehydrogenation on a copper-platinum catalyst

Galimova, N. A.; Pskhu, Z. V.; Naumkin, A. V.; Volkov, I. O.; Yagodovskaya, T. V.; Platonov, E. A.; Yagodovskii, V. D.

doi:10.1134/s0036024410110166

Cited by 8 publications

(3 citation statements)

References 1 publication

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“…This is indicated by the appearance of weak diffraction peaks in the XRD spectra of the catalysts after plasmochemical treat ments; the strongest among them were observed after the treatment of catalyst I with oxygen plasma. By analogy with the results of an X ray photoelectron spectroscopy study of plasma effects on the activity of the Pt/SiO 2 catalyst [8,9], we can assume that active carbon appears in the active centers of the copper cat alyst after plasmochemical treatments. The formation of new centers, having another structure and compo sition, obviously changes the reaction mechanism, as indicated by a change in the reaction order after treat ments with Н 2 and Ar plasma.…”

Section: Effects Of Plasmochemical Treatments and Cerium Additions Onmentioning

confidence: 98%

Effects of plasmochemical treatments and cerium additions on the structural characteristics and activity of copper catalyst particles in isopropanol dehydrogenation

Platonov

Лобанов

Galimova

et al. 2012

Russ. J. Phys. Chem.

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The effect of the treatment of the 5 wt % Cu/SiO 2 (I) and (5 wt % Cu + 0.5 wt % Ce)/SiO 2 (II) catalysts with glow discharge plasma in O 2 , H 2 , and Ar on their structural characteristics was studied by X ray phase analysis; the influence of cerium additions and plasmochemical treatments on the catalyst activity in isopropanol dehydrogenation was also investigated. Under the plasmochemical treatment, the diameters of Cu particles in catalyst I nearly doubled and microstresses in the metal particles also changed. Catalyst II was X ray amorphous both before and after plasmochemical treatments. The activity of I after plasmochemical treatment increased because of the increase in the number of centers and changes in their composition. Growth of the activity of I compared with the activity of II was explained by the formation of new catalytic centers due to positive charging of the Ce +α adatom on the surface of the copper particle.

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Section: Effects Of Plasmochemical Treatments and Cerium Additions Onmentioning

confidence: 98%

Effects of plasmochemical treatments and cerium additions on the structural characteristics and activity of copper catalyst particles in isopropanol dehydrogenation

Platonov

Лобанов

Galimova

et al. 2012

Russ. J. Phys. Chem.

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“…However, the general method to improve the activity of single Pt catalysts in the dehydrogenation process of homogeneous LOHC is to prepare bimetallic catalysts by combining Pt with Rh, Ir, W, Re, Sn, Ni, Cu, Mo, Mn, etc. ,,− The main functions of these additives are classified from three aspects: the addition of new function and geometric and electronic effect. For example, in the screening study of cyclohexane dehydrogenation over Al 2 O 3 -supported Pt bimetallic catalyst, the addition of Rh, Ir, and Re enhanced the activity of bare Pt(111) .…”

Section: Introductionmentioning

confidence: 99%

Crystal Facet Structure Dependence and Promising Pd–Pt Catalytic Materials for Perhydroacenaphthene Dehydrogenation

Wang,

Liu

2023

ACS Appl. Mater. Interfaces

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Designing an effective Pd−Pt catalytic material with excellent catalytic performance for perhydroacenaphthene (PHAN) dehydrogenation is a great challenge. In this work, in order to explore the crystal facet structure over the bimetallic Pd−Pt catalyst on the dehydrogenation performance of PHAN, the surface compositions of two kinds of Pd (Pt) atoms with different coverage on Pd modulated Pt (PdPt) and Pt modulated Pd (PtPd) catalysts were designed and studied by means of density functional theory (DFT). Through the investigation of the reaction path of PHAN dehydrogenation on Pd ML Pt(111) and Pt ML Pd(111) surfaces, it was found that Pd ML Pt(111) was advantageous to PHAN dehydrogenation (E a = 2.317 eV). This was attributed to a lower energy barrier, more stable dehydrogenation products, and the fact that Pd doping brought Pt(111) close to the Fermi level. Apparently, Pd modulated Pt catalyst has a broad application prospect in the dehydrogenation of PHAN. In the process of optimizing the PdPt morphology, a method for selecting the minimum active unit of PdPt catalysts with different ratios was proposed, that is, the most stable active unit: rhombus structure was determined according to the surface formation energy. Moreover, we correlated the relationship among the number of H atoms removed, adsorption energy, surface charge, activation energy, reaction energy, and surface coverage, and obtained the important parameters to predict the performance of PdPt catalyst in PHAN dehydrogenation system: surface charge and d-band center. Finally, the essential correlativity among Pd−Pt surface characteristics, catalytic PHAN activity, and adsorption energy was constructed; that is, the relationship model among d-band center, H atom, and product C 12 H 8 adsorption energy was established. This work opens a new simultaneous path to improve the catalytic performance of Pd−Pt-based catalytic materials for PHAN dehydrogenation, which can be achieved by regulating the rhombic active units of Pt modulated by Pd.

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“…Investigations of the activity of platinum catalysts that underwent plasma chemical treatment and were promoted by copper additives [1] gave rise to an idea of estimating the effect of both factors on the kinetic parameters of the hydrogen desorption in order to determine the H-Pt bond energy.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of platinum with copper and by plasma-chemical treatment and the effect on H-Pt bond energy

Bratchikova

Galimova

Лобанов

et al. 2012

Prot Met Phys Chem Surf

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Kinetics of H 2 desorption from the surface of a platinum catalyst applied to silica gel, as well as from the surface of the same catalyst modified with a copper additive, is studied. Desorption of hydrogen was studied both before and after the treatment of the catalyst in the electric glow discharge of argon or oxygen or in the high frequency H 2 plasma. The H-Pt bond energy was found to increase upon the introduction of cop per additive and decrease upon the plasma chemical treatment of copper-platinum specimens. In the latter case, the size of metal particles increases and the microstrain in them decreases. The observed changes in HPt bond energy are explained by the change in the electronic state of the surface and the increase in the num ber of metal structure defects.

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Cyclohexane dehydrogenation on a copper-platinum catalyst

Cited by 8 publications

References 1 publication

Effects of plasmochemical treatments and cerium additions on the structural characteristics and activity of copper catalyst particles in isopropanol dehydrogenation

Effects of plasmochemical treatments and cerium additions on the structural characteristics and activity of copper catalyst particles in isopropanol dehydrogenation

Crystal Facet Structure Dependence and Promising Pd–Pt Catalytic Materials for Perhydroacenaphthene Dehydrogenation

Surface modification of platinum with copper and by plasma-chemical treatment and the effect on H-Pt bond energy

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