Size-dependent CO and propylene oxidation activities of platinum nanoparticles on the monolithic Pt/TiO2–YOxdiesel oxidation catalyst under simulative diesel exhaust conditions

2015 ◽  
Vol 5 (4) ◽  
pp. 2358-2365 ◽  
Author(s):  
Zhengzheng Yang ◽  
Jun Li ◽  
Hailong Zhang ◽  
Yi Yang ◽  
Maochu Gong ◽  
...  
Keyword(s):  
Diesel Exhaust ◽  
Platinum Nanoparticles ◽  
Platinum Oxide ◽  
Active Species ◽  
Oxidation Catalyst ◽  
Propylene Oxidation ◽  
Size Dependent ◽  
Oxide Particles ◽  
Doc Reactivity

Small platinum oxide particles are beneficial for forming Pt0active species under diesel exhaust conditions, hence showing better DOC reactivity.

Size-Dependent Catalytic Cyclohexane Dehydrogenation with Platinum Nanoparticles on Nitrogen-Doped Carbon

2020 ◽  
Vol 34 (12) ◽  
pp. 16542-16551
Author(s):  
Jian Wang ◽  
He Liu ◽  
Shiguang Fan ◽  
Weining Li ◽  
Zhuo Li ◽  
...  
Keyword(s):  
Platinum Nanoparticles ◽  
Nitrogen Doped ◽  
Size Dependent ◽  
Cyclohexane Dehydrogenation ◽  
Nitrogen Doped Carbon

Catalytic deuterium exchange reactions with organics. XXIV. Electron spin resonance studies of adsorption on platinum oxide

1966 ◽  
Vol 19 (4) ◽  
pp. 529 ◽  
Author(s):  
IT Ernst ◽  
JL Garnett ◽  
WA Sollich-Baumgartner
Keyword(s):  
Transition Metal Oxides ◽  
Hydrogen Exchange ◽  
Platinum Oxide ◽  
Active Species ◽  
Paramagnetic Species ◽  
Charge Transfer Complexes ◽  
Severe Reaction ◽  
Exchange Reactions ◽  
Spin Resonance ◽  
Solid Liquid

The formation of paramagnetic species on catalyst surfaces at room temperature through the interaction of polynuclear aromatics in solid, liquid, or solute form with hydrated platinum oxide (PtO2,2H2O) is reported. The results are attributed to the formation of charge-transfer complexes, where the transferred electrons couple weakly, forming essentially a "diradicaloid" complex with a low-lying, thermally populated, triplet state. The effect of solvent, particle size, oxygen, water of crystallization, and temperature on the generation and stability of these e.s.r. active species has been investigated. The possible importance of these paramagnetic species in catalytic self-activation and hydrogen exchange reactions has been discussed. The following Group VIII transition metal oxides gave no e.s.r. spectra under relatively severe reaction conditions such as 1 hr at 120�: PdO; Ru02,2H20; RuO2; Rh2O3; IrO2,2H2O; ReO2; and NiO.

Allometry of pharmacokinetics and pharmacodynamics of the muscle relaxant metocurine in mammals

1995 ◽  
Vol 268 (1) ◽  
pp. R85-R91 ◽  
Author(s):  
G. A. Gronert ◽  
D. L. Fung ◽  
J. H. Jones ◽  
S. L. Shafer ◽  
S. V. Hildebrand ◽  
...  
Keyword(s):  
Muscle Relaxant ◽  
Bimodal Distribution ◽  
Active Species ◽  
Individual Species ◽  
Effect Compartment ◽  
Large Species ◽  
Pharmacokinetics And Pharmacodynamics ◽  
Size Dependent ◽  
Physiological Time ◽  
Allometric Analysis

We investigated the effects of body size on the pharmacokinetics and pharmacodynamics of the renally cleared muscle relaxant metocurine. We hypothesized that pharmacokinetics of the drug would change allometrically in proportion to physiological time [infinity Mb0.25, where Mb is body mass] and that pharmacodynamics would be independent of size because of the highly conserved structure of the acetylcholine receptor. Metocurine effects during general anesthesia were examined in 17 rats, 8 cats, 6 dogs, 5 pigs, 7 sheep, and 12 horses. Allometric analysis demonstrated size dependence for pharmacokinetics, which were affected by physiological time (Mb0.25). Pharmacodynamics were size independent, except for the value for effect compartment concentration associated with 50% twitch paralysis (IC50). Data from individual species had a bimodal distribution that was significant: pigs and sheep were more sensitive than other large species, and their IC50 appeared size independent. IC50 was size dependent in more active species (horse, dog, cat, rat). Although the mechanism is unknown, we speculate that this trend might relate to receptor density within the end plate. Thus pharmacokinetics changed in proportion to physiological time, and pharmacodynamics were in part size independent.

scholarly journals Size-dependent antioxidative activity of platinum nanoparticles

2013 ◽  
Vol 7 (S6) ◽  
Author(s):  
Hidekazu Nakanishi ◽  
Takeki Hamasaki ◽  
Tomoya Kinjo ◽  
Kiichiro Teruya ◽  
Shigeru Kabayama ◽  
...  
Keyword(s):  
Platinum Nanoparticles ◽  
Antioxidative Activity ◽  
Size Dependent

A Study of PGM-Free Oxidation Catalyst YMnO3 for Diesel Exhaust Aftertreatment

2012 ◽  
Author(s):  
Keita Ishizaki ◽  
Naoki Mitsuda ◽  
Naoki Ohya ◽  
Hiroshi Ohno ◽  
Takahiro Naka ◽  
...  
Keyword(s):  
Diesel Exhaust ◽  
Oxidation Catalyst ◽  
Exhaust Aftertreatment ◽  
Free Oxidation

scholarly journals Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal–Support Interaction between Platinum Nanoparticles and Nanosized Ceria

ACS Catalysis ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 6151-6155 ◽  
Author(s):  
Suresh Gatla ◽  
Daniel Aubert ◽  
Giovanni Agostini ◽  
Olivier Mathon ◽  
Sakura Pascarelli ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Platinum Nanoparticles ◽  
Room Temperature ◽  
Oxidation Catalyst ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support
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