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Platinum group Wikipedia

The platinum-group metals (abbreviated as the PGMs; alternatively, the platinoids, platinides, platidises, platinum group, platinum metals, platinum family or platinum-group elements (PGEs)) are six noble, precious metallic elements clustered together in the periodic table.These elements are all transition metals in the d-block (groups 8, 9, and 10, periods 5 and 6).

Platinum Metals as Hydrogenation Catalysts Johnson

As has been mentioned previously, metals of the platinum group are highly active for the hydrogenation of olefinic double bonds (6, 7), more so than nickel, although fewer studies on reaction mechanisms have been carried out using platinum metals than using nickel.It is, however, likely that olefines are relatively less strongly adsorbed on platinum than on nickel, and it has been estimated

Formic Acid Electrooxidation on Platinum-Group Metals: Is

Oct 07, 2000 The possibility that adsorbed carbon monoxide may act as a reaction intermediate rather than merely a catalytic poison for formic acid electrooxidation on Pt-group metals in aqueous perchloric acid is explored by monitoring the time-dependent effects of reactant 13C/12C isotopic substitution on the adsorbate vibrational properties, as discerned from surface-enhanced Raman spectroscopy (SERS

Hydrogenation of adsorbed carbon monoxide on supported

Jan 01, 1980 Hydrogenation of adsorbed carbon monoxide on supported platinum group metals was studied by in situ ir spectroscopy and reactive temperature-programmed desorption (RTD) methods using hydrogen as a carrier gas. The main product of the hydrogenation was methane. The RTD gave spectra for methane formation which showed peaks between 423 and 650 K

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Platinum Group Metals (PGM) DuPont

Separation of Platinum Group Metals (PGM) from Liquid Media Technetium (particularly Tc 7+ ), ruthenium (particularly Ru 4+ ), rhodium (particularly Rh 4+ and Rh 3+ ), rhenium (particularly Re 7+ ), and iridium (particularly Ir 4+ and Ir 3+ ) can be ionically grouped with the Platinum Group Metals (PGM) because they form stable oxyanion complexes

Establishing reactivity descriptors for platinum group

We report a comprehensive analysis of the catalytic oxygen reduction reaction (ORR) reactivity of four of today's most active benchmark platinum group metal-free (PGM-free) iron/nitrogen doped carbon electrocatalysts (Fe–N–Cs). Our analysis reaches far beyond previous such attempts in linking kinetic perform Recent Open Access Articles

Hydrogenation of Carbon Monoxide Adsorbed on Supported

Hydrogenation of carbon monoxide adsorbed on supported platinum group metals was studied by the in-situ IR spectroscopy and the temperature programmed desorption (TPD) method using hydrogen as a carrier gas. The main product of hydrogenation was methane, and the TPD gave the spectra of methane formation which showed peaks between 150°C and 380

The Nature of Hydrogen Adsorption on Platinum in the

Jul 31, 2020 The thermodynamic state of H 2 adsorbed on Pt in the aqueous phase was determined by kinetic analysis of H 2 reacting with D 2 O to HDO, HD, and D 2, and by DFT‐based ab initio molecular dynamics simulations of H 2 adsorption on Pt(111), Pt(110), and Pt nanoparticles. Dissociative adsorption of H 2 on Pt is significantly weakened in the aqueous phase compared to adsorption at gas–solid

(PDF) To the theoretical analysis of the work function

platinum group metals adsorbed on (110) W Sergei Y. Davydov * A.F. loffe Physical Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

Formic Acid Electrooxidation on Platinum-Group Metals: Is

The possibility that adsorbed carbon monoxide may act as a reaction intermediate rather than merely a catalytic poison for formic acid electrooxidation on Pt-group metals in aqueous perchloric

Why does platinum adsorb hydrogen Physics Forums

Sep 17, 2013 Why does platinum adsorbs hydrogen, when platinum being one of the inert element? Is there any law which states about the adsorbent and the adsorbent gas? Why do some elements like platinum absorbs while some elements doesn't adsorb gases!? Is there a way to predict that this element or compound will absorb this kind of substances upto this extent.

Aqueous phase catalytic and electrocatalytic hydrogenation

Feb 01, 2020 1. Introduction. Catalytic and electrocatalytic reactions on Pt group metals in the aqueous phase are important for carbon neutral pathways to fuels and chemicals,,,.Understanding the reaction mechanisms involved in these transformations is important to improving catalytic reaction rates, either by controlling reaction conditions to maximize rates on a given catalyst, or selecting new

8.7: Reduction of Alkenes Hydrogenation Chemistry

Aug 11, 2020 Finely divided metals, such as platinum, palladium and nickel, are among the most widely used hydrogenation catalysts. Catalytic hydrogenation takes place in at least two stages, as depicted in the diagram. First, the alkene must be adsorbed on the surface of the catalyst along with some of the hydrogen.

The Role of Platinum in Proton Exchange Membrane Fuel

Proton exchange membrane fuel cells (PEMFCs) dominate the transportation fuel cell market and platinum (Pt) is the catalyst material used for both anode and cathode. This review sets out the fundamentals of activity, selectivity, stability and poisoning resistance which make Pt or its alloys the best available materials to use in this application. It is clear that Pt is the only element which

Evaluation of Polycrystalline Platinum and Rhodium

adsorbed [8, 10, 11]. In the absence of other adsorbed species, for example aqueous SO 2, it has been noted that adsorbed elemental sulfur can only be removed ox-idatively (according to reaction 4) from a platinum elec-trode through cycling the electrode to potentials greater than 1.2 V [9]. Pt−S ads þ4H 2O→SO 4 2 − þ8Hþ þ6e− E≥1

Platinum Film Growth by Chemical Vapor Deposition Based on

Dec 06, 2019 Platinum thin films were prepared by chemical vapor deposition based on the oxidative decomposition of However, in reductive decomposition, the functional group adsorbed on the surface was desorbed as growth temperature increased, resulting in a longer initial stage. (This result is contrary to adsorption in oxidative decomposition.)

Universal dependence of hydrogen oxidation and evolution

Understanding how pH affects the activity of hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) is key to developing active, stable, and affordable HOR/HER catalysts for hydroxide exchange membrane fuel cells and electrolyzers. A common linear correlation between hydrogen binding energy (HBE) and pH is observed for four supported platinum-group metal catalysts (Pt/C, Ir/C

New insight brings sustainable hydrogen one step closer

Oct 19, 2020 More information: Ian McCrum & Marc Koper, The role of adsorbed hydroxide in hydrogen evolution reaction kinetics on modified platinum, Nature Energy (19 October, 2020) DOI: 10.1038/s41560-020-00710-8

Platinum Group Metals (PGM) DuPont

Separation of Platinum Group Metals (PGM) from Liquid Media Technetium (particularly Tc 7+ ), ruthenium (particularly Ru 4+ ), rhodium (particularly Rh 4+ and Rh 3+ ), rhenium (particularly Re 7+ ), and iridium (particularly Ir 4+ and Ir 3+ ) can be ionically grouped with the Platinum Group Metals (PGM) because they form stable oxyanion complexes

Establishing reactivity descriptors for platinum group

We report a comprehensive analysis of the catalytic oxygen reduction reaction (ORR) reactivity of four of today's most active benchmark platinum group metal-free (PGM-free) iron/nitrogen doped carbon electrocatalysts (Fe–N–Cs). Our analysis reaches far beyond previous such attempts in linking kinetic perform Recent Open Access Articles

Investigation of the poisoning of platinum group catalysts

The state of mercury adsorbed on a platinum catalyst has been investigated by thermal desorption techniques. The activity of the catalyst for benzene hydrogenation has also been measured. The results show that a catalyst with mercury adsorbed in more than one state can still hydrogenate benzene. The suggested mecha

Platinum Metal Based Materials Electrical Contacts

The platinum group metals include the For electrical contacts platinum and palladium have practical significance as base alloy materials and ruthenium and iridium are used as alloying components. Pt and Pd have similar corrosion resistance as gold but because of their catalytical properties they tend to polymerize adsorbed organic vapors on

The Nature of Hydrogen Adsorption on Platinum in the

Jul 31, 2020 The thermodynamic state of H 2 adsorbed on Pt in the aqueous phase was determined by kinetic analysis of H 2 reacting with D 2 O to HDO, HD, and D 2, and by DFT‐based ab initio molecular dynamics simulations of H 2 adsorption on Pt(111), Pt(110), and Pt nanoparticles. Dissociative adsorption of H 2 on Pt is significantly weakened in the aqueous phase compared to adsorption at gas–solid

(PDF) To the theoretical analysis of the work function

platinum group metals adsorbed on (110) W Sergei Y. Davydov * A.F. loffe Physical Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

Evaluation of Polycrystalline Platinum and Rhodium

adsorbed [8, 10, 11]. In the absence of other adsorbed species, for example aqueous SO 2, it has been noted that adsorbed elemental sulfur can only be removed ox-idatively (according to reaction 4) from a platinum elec-trode through cycling the electrode to potentials greater than 1.2 V [9]. Pt−S ads þ4H 2O→SO 4 2 − þ8Hþ þ6e− E≥1

Why does platinum adsorb hydrogen Physics Forums

Sep 17, 2013 Why does platinum adsorbs hydrogen, when platinum being one of the inert element? Is there any law which states about the adsorbent and the adsorbent gas? Why do some elements like platinum absorbs while some elements doesn't adsorb gases!? Is there a way to predict that this element or compound will absorb this kind of substances upto this extent.

Locations of Deposits

Platinum Group Elements (PGEs) Platinum group elements are mined from mafic and ultramafic igneous rocks, in alluvial and placer deposits, hydrothermal veins, and contact mineralization deposits. They also occur in the mineral cooperite and in igneous rocks (Pohl, 2011). Here is a map of all PGE deposits in the world: (Goodfellow, 2006)

The Role of Platinum in Proton Exchange Membrane Fuel

Proton exchange membrane fuel cells (PEMFCs) dominate the transportation fuel cell market and platinum (Pt) is the catalyst material used for both anode and cathode. This review sets out the fundamentals of activity, selectivity, stability and poisoning resistance which make Pt or its alloys the best available materials to use in this application. It is clear that Pt is the only element which

29. PALLADIUM, PLATINUM, AND GOLD DISTRIBUTION IN

The mobility of platinum-group elements (PGE) in hydrothermal solutions has only recently received attention by geologists. This was mainly because of the beliefs (1) that PGEs are inert under most geological environments, (2) that PGE deposits can be explained by magmatic processes, and (3) the scarcity of proven hydrothermal PGE deposits.

Platinum Film Growth by Chemical Vapor Deposition Based on

Dec 06, 2019 Platinum thin films were prepared by chemical vapor deposition based on the oxidative decomposition of However, in reductive decomposition, the functional group adsorbed on the surface was desorbed as growth temperature increased, resulting in a longer initial stage. (This result is contrary to adsorption in oxidative decomposition.)

Recovery of platinum group metals from secondary materials

Sep 23, 2006 Thermodynamic predictions are reported for platinum and palladium in aqueous ammonia and iodide solutions, to define less aggressive conditions than used hitherto for leaching palladium and platinum from secondary materials. Cyclic voltammetry and amperometry of thin films of palladium, electrodeposited onto rotating vitreous carbon disc electrodes, indicated that partially oxidised adsorbed

To the theoretical analysis of the work function changes

To the theoretical analysis of the work function changes of platinum group metals adsorbed on (110) W Davydov, Sergei Y. Abstract. The simple theoretical model based on the Anderson-Newns Hamiltonian is proposed for the description of work function changes for different surface structures of adatoms. The direct exchange interaction of adjacent