Relevant bibliographies by topics / X-rays. Molybdenum. Palladium

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Academic literature on the topic 'X-rays. Molybdenum. Palladium'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "X-rays. Molybdenum. Palladium"

1

Szymańska, Ewa, Łukasz Syrocki, Katarzyna Słabkowska, and Marek Polasik. "Diagnostics of the plasma parameters based on the K X-ray line positions for various 4d and 4f metals." Nukleonika 61, no. 4 (December 1, 2016): 437–41. http://dx.doi.org/10.1515/nuka-2016-0072.

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Abstract This paper shows the theoretical predictions of the outer-shell ionization effect on the positions of Kα1,2, Kβ1,3, and K β2 X-ray lines for some 4d-transition metals (molybdenum and palladium) and 4f rare-earth elements (dysprosium and ytterbium). The ionization energy shifts have been evaluated using the multiconfiguration Dirac-Fock method, containing Breit interaction and quantum electrodynamic (QED) corrections. The presented results are important for obtaining the information about some parameters of plasma generated by different sources, especially by pulsed power machine and short-pulse lasers.
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2

Kntapo, Fatimah M., Abubakar G. Salisu, and Rukaiyat M. Said. "X-Ray flourescence (XRF) elemental composition of Euphorbia hirta Linn (Asthma weed) as a medicinal plant." Asian Journal of Medical and Biological Research 4, no. 1 (June 7, 2018): 49–54. http://dx.doi.org/10.3329/ajmbr.v4i1.36821.

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Euphobia hirta (Eh) was subjected to elemental analysis using X-ray fluorescence (XRF), and the results revealed the following concentrations of the elements : sulphur (4.128 mg/kg), potassium (58.755 mg/ kg), calcium (34.102mg/kg), scandium (0.256mg/kg), titanium (0.348 mg/kg), iron (2.124 mg/mg), zinc (0.108 mg/kg), rubidium (0.040 mg/kg), strontium (0.089mg/kg), zireonium (0.026mg/kg), molybdenum (0.006 mg/kg) and thorium (0.120 mg/kg) respectively. All elements analysed above were within the permissible limit set by World Health Organization (WHO) and Food and Agricultural Organization (FAO).Vanadium, chromium, manganese, cobalt, nickel, copper, arsenic, selenium, palladium, silver, cadmium, tin, antimony, tellurium, caesium, barium, tungsten, gold, mercury and lead were not detected in the sample.Asian J. Med. Biol. Res. March 2018, 4(1): 49-54
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3

Yang, Yue, Xiaochen Liu, Yuanjie Xu, Xing Gao, Yihu Dai, and Yu Tang. "Palladium-Incorporated α-MoC Mesoporous Composites for Enhanced Direct Hydrodeoxygenation of Anisole." Catalysts 11, no. 3 (March 12, 2021): 370. http://dx.doi.org/10.3390/catal11030370.

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Hydrodeoxygenation (HDO) is one of the promising catalytic routes for converting biomass derived molecules to high value products. A key step of HDO is the cleavage of an aromatic C–O bond to accomplish the deoxygenation step, however, which is energetically unfavorable. Herein, we report a series of palladium (Pd)-incorporated α-phase of molybdenum carbide (α-MoC) mesoporous composites for enhanced HDO activity of a biomass model molecule, anisole. The catalysts, x%Pd/α-MoC (x% is the molar ratio of Pd/Mo), were investigated by X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed desorption (TPD), Brunauer–Emmett–Teller (BET), Raman, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques. Pd is highly dispersed on α-MoC when x% ≤ 1%, but aggregate to form nanoparticles when x% = 5%. The x%Pd/α-MoC catalysts (x% ≤ 1%) show enhanced HDO activity in terms of turnover frequency (TOF) and apparent activation energy barrier (Ea) compared with α-MoC and β-Mo2C catalysts. The TOF of 1%Pd/α-MoC catalyst at 160 °C is 0.115 h−1 and the Ea is 48.2 kJ/mol. Moreover, the direct cleavage of aromatic C–O bond is preferred on 1%Pd/α-MoC catalyst. The enhanced HDO activity is attributed to superior H2 dissociation ability by the highly dispersed Pd sites on carbide. This work brings new insights for rational design of the catalyst for selective C–O bond activation.
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4

Fokina, Z. A. "35Cl and 79Br NQR Spectra and the Secondary Bonding of Chalcogen Halide Complexes." Zeitschrift für Naturforschung A 55, no. 1-2 (February 1, 2000): 160–66. http://dx.doi.org/10.1515/zna-2000-1-228.

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The 35Cl and 79Br NQR spectra of chalcogen halide complexes of aluminium, gallium, titanium, zirconium, hafnium, niobium, tantalum, molybdenum, tungsten, rhenium, iron, ruthenium, osmium, iridium, rhodium, platinum, palladium and gold are discussed. Three structure types of these complexes have been distinguished by X-ray structure analysis: type I with AX2 ligand and [MXn„Am] coordination polyhedron; type II with AX3 ligand and [MXn+m] coordination polyhedron; type III, dimeric complexes with M-X-M bridge (where X = Cl, Br and A = S, Se, Te). The formation of secondary M-X-A or M-X-M bonds is characteristic of most structures. The spectra were interpreted by a Townes. Dailey approximation with allowance for the electronic configuration of the metal, mutual influence of ligands and structure features of complexes. Systematic investigation of a big series of chalcogen halide complexes-analogues allowed the following changes in 35CI and 79Br NQR frequencies on secondary bonding to be established for intraligand halogen atoms: A decrease in frequency for type I complexes and an increase in frequency for type II complexes; for halogen atoms in the coordination polyhedron: a decrease in frequency for p metals and transition metals with d>6, and an increase in frequency for metals with d< 6.
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5

Croizat, Pierre, Frank Müller, Hubert Mantz, Andreas Englisch, Richard Welter, Stefan Hüfner, and Pierre Braunstein. "Synthesis of functional heterometallic complexes and clusters containing molybdenum and palladium or platinum, their self-assembly on gold surfaces and X-ray photoelectron spectroscopic studies." Comptes Rendus Chimie 12, no. 10-11 (October 2009): 1228–47. http://dx.doi.org/10.1016/j.crci.2008.12.004.

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6

Stromnova, T. A., I. N. Busygina, S. B. Katser, A. S. Antsyshkina, M. A. Porai-Koshits, and I. I. Moiseev. "Synthesis and X-ray crystal and molecular structure of the palladium–molybdenum carbonyl cluster Na2{Pd4[CpMo(CO)3]4}·2THF (THF = tetrahydrofuran; Cp =η5-cyclopentadienyl)." J. Chem. Soc., Chem. Commun., no. 2 (1988): 114–15. http://dx.doi.org/10.1039/c39880000114.

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7

Macchioni, Alceo, Paul S. Pregosin, Philippus F. Engel, Stefan Mecking, Michel Pfeffer, Jean-Claude Daran, and Jacqueline Vaissermann. "Multinuclear NMR Studies and Reaction with tert-Butyl Isocyanide of Dinuclear Tungsten- or Molybdenum-Palladium .mu.-Alkylidene Complexes. X-ray Structure of [PdI[.mu.-C(p-tolyl)dmba][.mu.-CO]Mo(Cp)(CN-t-Bu)2]." Organometallics 14, no. 4 (April 1995): 1637–45. http://dx.doi.org/10.1021/om00004a018.

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8

Palmer, J., J. Yi, R. Wallace, and W. Anderson. "Conduction Mechanisms In Crystallized Silicon Films On Molybdenum Substrates." MRS Proceedings 321 (1993). http://dx.doi.org/10.1557/proc-321-695.

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ABSTRACTHydrogenated Amorphous silicon films deposited on molybdenum sheet metal substrates have been crystallized by thermal annealing at 850°C for 4 hours in a nitrogen atmosphere. X-ray diffraction and scanning electron microscopy results indicated that the average grain size in the crystallized films was approximately 200A. Palladium contacts were fabricated and the resulting Pd/Si/Mo structures were electrically characterized. Current-voltage-temperature measurements for phosphorus doped and undoped annealed samples resulted in a J “V characteristic consistent with space-charge-limited current. Using this data, Mobility as a function of temperature from 100K-300K was obtained. In phosphorus doped samples, the mobility appeared to be limited by energy barriers at the grain boundaries. In undoped samples, a σ “T’ exp (-b/T’) temperature dependence consistent with variable-range hopping conduction was observed.
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9

Fornazier Filho, Yonis, Ana Caroliny Carvalho da Cruz, Rolando Pedicini, José Ricardo Cezar Salgado, Priscilla Paiva Luz, and Josimar Ribeiro. "Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell." Materials for Renewable and Sustainable Energy 10, no. 1 (February 2, 2021). http://dx.doi.org/10.1007/s40243-020-00187-1.

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AbstractPhysical and electrochemical properties of Pd catalysts combined with Ru and Mo on carbon support were investigated. To this end, Pd, Pd1.3Ru1.0, Pd3.2Ru1.3Mo1.0 and Pd1.5Ru0.8Mo1.0 were synthesized on Carbon Vulcan XC72 support by the method of thermal decomposition of polymeric precursors and then physically and electrochemically characterized. The highest reaction yields are obtained for Pd3.2Ru1.3Mo1.0/C and Pd1.5Ru0.8Mo1.0/C and, as demonstrated by thermal analysis, they also show the smallest metal/carbon ratio compared the other catalysts. XRD (X-ray Diffraction) and Raman analyses show the presence of PdO and RuO2 for the Pd/C and the Pd1.3Ru1.0/C catalysts, respectively, a fact not observed for the Pd3.2Ru1.3 Mo1.0 /C and the Pd1.5Ru0.8Mo1.0/C catalysts. The catalytic activities were tested for the ethanol oxidation in alkaline medium. Cyclic voltammetry (CV) shows Pd1.3Ru1.0/C exhibiting the highest peak of current density, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. From, chronoamperometry (CA), it is possible to observe the lowest rate of poisoning for the Pd1.3Ru1.0/C, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. These results suggested that catalytic activity of the binary and the ternary catalysts are improved in comparison with Pd/C. The presence of RuO2 activated the bifunctional mechanism and improved the catalytic activity in the Pd1.3Ru1.0/C catalyst. The addition of Mo in the catalysts enhanced the catalytic activity by the intrinsic mechanism, suggesting a synergistic effect between metals. In summary, we suggest that it is possible to synthesize ternary PdRuMo catalysts supported on Carbon Vulcan XC72, resulting in materials with lower poisoning rates and lower costs than Pd/C. Graphic abstract
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