Temat: platinum - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Activity of perovskite catalysts contain Pt or Pd in toluene oxidation
Autorzy:: Borzęcka, A.
Tematy:: VOCs oxidation
perovskite
platinum
palladium; Pokaż więcej
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Powiązania:: https://bibliotekanauki.pl/articles/115915.pdf Link otwiera się w nowym oknie
Opis:: Perovskite catalysts with active phase composed of LaMnO₃ or La_0.75Ag_0.25MnO₃ doped with noble metals — platinum or palladium — were tested for activity in oxidation of toluene. Their impregnation with solution of Pt or Pd compounds increased the catalytic activity. LaMnO₃ with Pt content displayed the highest activity. LaMnO₃ perovskite doped with both noble metals show higher activity than when noble metals were added to La_0.75Ag_0.25MnO₃ perovskite.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Click chelators for platinum‐based anticancer drugs
Autorzy:: Aitken, David J.
Maisonial, Aurélie
Lemoine, Pascale
Gautier, Arnaud
Viossat, Bernard
Traïkia, Mounir
Serafin, Patrycja
Debiton, Eric
Théry, Vincent
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Occurrence of platinum group metals in the environment and their use
Występowanie platynowców w środowisku i ich zastosowanie
Autorzy:: Trębacz, H.
Michno, P.
Tematy:: platinum group metals
platinum
palladium
rod
osmium
ruthenium
iridium
platynowce
platyna
pallad
osm
ruten
iryd; Pokaż więcej
Wydawca:: Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Powiązania:: https://bibliotekanauki.pl/articles/402100.pdf Link otwiera się w nowym oknie
Opis:: Monoliths that are part of the automotive catalysts include noble metals: platinum, palladium and rhodium, which acts as a catalyst. During the operation of these devices platinum group elements (PGE) are released into the environment. The characteristics of individual metals belonging to the platinum group are presented in this article. These metals can be found in road sediments as well as in water or food. Platinum resources are constantly shrinking, so one of the ideas is their exploitation from the solar system. This article also presents methods of platinum recovery. The publication provides an overview of the literature on platinum-related issues.
Monolity, które są częścią katalizatorów samochodowych, zawierają metale szlachetne: platynę, pallad i rod, które pełnią funkcję katalityczne. W trakcie eksploatacji tych urządzeń następuje emisja platynowców do środowiska. Przedstawiono charakterystykę poszczególnych platynowców. Metale te możemy odnaleźć w osadach drogowych, jak i w wodzie czy żywności. Zasoby platynowców stale się kurczą, dlatego jednym z pomysłów jest ich eksploatacja z Układu Słonecznego. Zaprezentowano również metody odzysku platynowców. W publikacji przedstawiono przegląd literatury dotyczącej zagadnień związanej z platynowcami.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Recovery of gold (III), palladium (II) and platinum (IV) ions from chloride solutions on the solvent impregnated resin (SIR) — Dowex Optipore L493
Autorzy:: Wójcik, G.
Hubicki, Z.
Górska, M.
Tematy:: gold
platinum
palladium
solvent impregnated resins; Pokaż więcej
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Powiązania:: https://bibliotekanauki.pl/articles/115536.pdf Link otwiera się w nowym oknie
Opis:: The method described in this paper using Dowex Optipore L493 for removal of gold (III), palladium (II), and platinum (IV) ions from hydrochloric solutions is found effective for separation of gold, palladium and platinum. There were carried out laboratory studies of selective removal of platinum (IV), gold (III) and palladium (II) microquantities from 0.1–6 M hydrochloric on the solvent impregnated highly cross-linked styrenic polymer, Dowex Optipore L493 using Cyanex 301. In these experiments the recovery factors % R of gold (III), palladium (II) and platinum (IV) depending on phases contact time were obtained. The gold, palladium and platinum concentrations were determined by the AAS method.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Influence of platinum ions on the germination and seedling root growth of different plant species
Autorzy:: Kołton, A.
Czaja, M.
Tematy:: platinum
root growth
tomato
oat
garden cress; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/184790.pdf Link otwiera się w nowym oknie
Opis:: For several decades an increase of platinum in the environment was recorded. This is connected with the release of platinum from automobile catalytic converters and pharmaceutical industries. In the conducted experiments the effect of various forms and concentrations of platinum on the germination and roots growth of different plants (oat, garden cress and tomato) was investigated. Two separate experiments were performed with lower (experiment 1st: 1, 5 and 10 mg/L) and higher (experiment 2nd: 10, 20 and 40 mg/L) [Pt(NH3)4](NO3)2 or PtCl4 dosages. There was no significant effect of dose and form of platinum on the germination of seeds (experiment 1st and 2nd). The effect of platinum containing substances dose on root growth of young seedlings was observed during experiment, dependent on the species of tested plants. The root length of oat plants was similar in all treatments in experiment 1st. The shortest tomato roots were observed in the case of a 10 mg/L of PtCl4, it was statistically shorter than the control plants (treated with water) as well. The roots of the tomato treated with [Pt(NH3)4](NO3)2 were the same length as observed for the control sample. The garden cress root growth was not affected by [Pt(NH3)4](NO3)2, but a solution containing Pt4+ stimulated the root growth. The roots of tomato and oat treated with [Pt(NH3)4](NO3)2 had similar length as the control plants in contrast to the far shorter roots treated with PtCl4 (experiment 2nd). Moreover, the treatment with [Pt(NH3)4](NO3)2 stimulated the growth of garden cress roots compared to the control, while only the lowest dose of PtCl4 stimulated the root growth.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: A review of investigations into the management of gangue in the flotation of platinum group minerals
Autorzy:: O’Connor, C.
Wiese, J.
Corin, K.
McFadzean, B.
Tematy:: Depressants
chromite
copper sulphate
platinum group minerals; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110708.pdf Link otwiera się w nowym oknie
Opis:: The Bushveld Complex of South Africa contains almost 90% of the world’s reserves of platinum group minerals (PGMs). In the flotation of PGMs, there are significant challenges arising from the need to treat ever-decreasing grades of the relevant ore deposits. The major challenge in the flotation of these ore bodies is the control and management of the gangue minerals, particularly silicates such as orthopyroxene, plagioclase feldspar, and pyroxene which are often rimmed with talc which makes them naturally floatable. It has been shown that various polysaccharide depressants such as CMC and guar have different properties in terms of depressing the gangue minerals. Since the PGMs are often associated with sulphides, copper sulphate is widely used as an activator in PGM flotation but can inadvertently activate the gangue minerals as well as reduce the recovery of PtTe2 which accounts for up to 40% of the Pt in the Platreef ore body. Depressants also reduce the mass of solids reporting to the froth and can thus destabilize the froth. This effect on the froth can be mitigated by using higher frother dosages or water of higher ionic strength. In summary due care needs to be taken to carry out site test work to develop an optimum ratio of collector, frother, activator and depressant to ensure that the highest grades and recoveries of the PGEs are obtained while reducing depressant dosage as much as possible. Chromite recoveries can be reduced through the application of gravity separation or reducing entrainment through reduced water recovery.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Sensitivity enhancement of a nanocomposite-based fiber optics sensor with platinum nanoparticles
Autorzy:: Vahed, Hamid
Ghazanfari, Elham
Tematy:: surface plasmon resonance
sensor
nanocomposite
platinum
sensitivity; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174148.pdf Link otwiera się w nowym oknie
Opis:: In this paper, sensitivity enhancement of a nanocomposite-based optical fiber sensor with platinum nanoparticles is investigated. This optical fiber sensor is based on the surface plasmon resonance in the nanocomposite layer coating the core of optical fiber. A comparison is carried out for sensitivity between an optical fiber sensor based surface plasmon resonance with platinum layer and the one with nanocomposite layer. The nanocomposite layer consists of platinum nanoparticles with varying volume fraction which is arrayed in a host dielectric material of InN or TiO₂. We show that the sensitivity of the sensor with a nanocomposite layer containing platinum nanoparticles is bigger than the sensitivity of the sensor with a platinum layer for all the values of refractive index of sample media. Also, the effect of the thickness of the nanocomposite layer and the volume fraction of platinum nanoparticles on the spectrum of the transmitted power has been investigated.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Anomalie platynowców w historii Ziemi
PGE anomalies in Earths history
Autorzy:: Wieczorek, Anna
Brachaniec, Tomasz
Tematy:: PGE
anomaly
geology
impact
platinum-group elements; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/1033071.pdf Link otwiera się w nowym oknie
Opis:: The platinum-group elements comprise a very small percentage of elements in the earth’s crust. The primary sources of them are meteorite impacts and volcanism. The study of PGEs anomaly in sediment profiles as a possible indicator of impact began in 1980, when was suggested a link between high levels of iridium and the mass extinction event in Late Cretaceous.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Kinetic Studies of Pt(IV) Chloride Complex Ions Reduction Reaction Using Potassium Formate
Autorzy:: Wojnicki, M.
Żabiński, P.
Csapó, Edit
Tematy:: platinum
recovery
recycling
activation energy
reaction mechanism; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351194.pdf Link otwiera się w nowym oknie
Opis:: In this paper, the kinetics of the platinum(IV) chloride complex ions reduction reaction was studied. It was shown that the mechanism exhibits autocatalytic character. The presence of metallic platinum in the system significantly increases the reaction rate. The influence of the initial concentration of precursor, reductant, ionic strength, initial concentration of the chloride ions as well as the temperature on the process rate was investigated. The activation energy was determined and is equal to 93.57 kJ/mol. Moreover, the obtained metallic phase was analyzed, and it was observed that it has a micrometric size.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Preliminary study of platinum accumulation in the fruitbodies of a model fungal species: king oyster mushroom (Pleurotus eryngii)
Autorzy:: Urban, P.
Bazała, M.
Asztemborska, M.
Manjón, J.
Kowalska, J.
Bystrzejewska-Piotrowska, G.
Pianka, D.
Stęborowski, R.
Kuthan, R. T.
Tematy:: bioaccumulation
bioremediation
fungi
heavy metals
mushrooms
mycoextraction
platinum; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147784.pdf Link otwiera się w nowym oknie
Opis:: A model species of saprophytic fungus, king oyster mushroom (Pleurotus eryngii), was cultivated on barley substrate supplied with [Pt(NH3)4](NO3)2, under well defined conditions. The samples of the collected fruiting bodies were digested and analyzed for total platinum content by means of ICP-MS. The results proved that platinum is not accumulated in the fruitbodies of Pleurotus eryngii for a wide range of Pt concentrations in the culture substrate (100 1000 ppb Pt in 50 ml of water solution added to ca. 450 g of hydrated barley seeds per container). Observable levels of Pt were only found in the fruitbodies obtained from the medium contaminated with 10000 ppb (10 ppm) platinum solution. This demonstrates significant difference in the effectiveness of platinum extraction in fungi and plants, which are capable to accumulate platinum even when supplied at lower concentration (<500 ppb). It also shows different physiological pathways of platinum and other elements which are easily accumulated in the fruitbodies of the same species.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "platinum" wg kryterium: Temat