Significant enhancement of catalytic properties in mononuclear yttrium complexes by nitrophenolate‐type ligands: Synthesis, structure, and catalysis for lactide polymerization

2019 ◽  
Vol 57 (19) ◽  
pp. 2038-2047
Author(s):  
Yu‐Chia Su ◽  
Ting‐Yu Chiu ◽  
Yun‐Ting Liu ◽  
Po‐Heng Lin ◽  
Bao‐Tsan Ko
Keyword(s):  
Catalytic Properties ◽  
Significant Enhancement ◽  
Yttrium Complexes ◽  
Lactide Polymerization

Phosphasalen Yttrium Complexes: Highly Active and Stereoselective Initiators for Lactide Polymerization

2012 ◽  
Vol 51 (4) ◽  
pp. 2157-2169 ◽  
Author(s):  
Thi-Phuong-Anh Cao ◽  
Antoine Buchard ◽  
Xavier F. Le Goff ◽  
Audrey Auffrant ◽  
Charlotte K. Williams
Keyword(s):  
Highly Active ◽  
Yttrium Complexes ◽  
Lactide Polymerization

A Series ofBis(phosphinic)diamido Yttrium Complexes As Initiators for Lactide Polymerization

2008 ◽  
Vol 47 (15) ◽  
pp. 6840-6849 ◽  
Author(s):  
Rachel H. Platel ◽  
Andrew J. P. White ◽  
Charlotte K. Williams
Keyword(s):  
Yttrium Complexes ◽  
Lactide Polymerization

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

Visual Spatial Attention in Migraine Sufferers in Postictal and Interictal Phases: An Event-Related Potential Study

2001 ◽  
Vol 15 (1) ◽  
pp. 22-34 ◽  
Author(s):  
D.H. de Koning ◽  
J.C. Woestenburg ◽  
M. Elton
Keyword(s):  
Cerebral Cortex ◽  
Visual Attention ◽  
Migraine Attack ◽  
Spatial Attention ◽  
Event Related Potential ◽  
Significant Enhancement ◽  
Pathophysiological Mechanism ◽  
Attention Task ◽  
Visual Spatial Attention ◽  
Visual Spatial

Migraineurs with and without aura (MWAs and MWOAs) as well as controls were measured twice with an interval of 7 days. The first session of recordings and tests for migraineurs was held about 7 hours after a migraine attack. We hypothesized that electrophysiological changes in the posterior cerebral cortex related to visual spatial attention are influenced by the level of arousal in migraineurs with aura, and that this varies over the course of time. ERPs related to the active visual attention task manifested significant differences between controls and both types of migraine sufferers for the N200, suggesting a common pathophysiological mechanism for migraineurs. Furthermore, migraineurs without aura (MWOAs) showed a significant enhancement for the N200 at the second session, indicating the relevance of time of measurement within migraine studies. Finally, migraineurs with aura (MWAs) showed significantly enhanced P240 and P300 components at central and parietal cortical sites compared to MWOAs and controls, which seemed to be maintained over both sessions and could be indicative of increased noradrenergic activity in MWAs.

Electron distribution change of small nickel particles encaged in X zeolite in presence of Ce3+ ions, related to their catalytic properties

1986 ◽  
Vol 83 ◽  
pp. 619-621 ◽  
Author(s):  
F. Vergand ◽  
B. Iraqi ◽  
C. Bonnelle ◽  
E. Ramaroson ◽  
M.F. Guilleux ◽  
...  
Keyword(s):  
Electron Distribution ◽  
Catalytic Properties ◽  
Distribution Change ◽  
Nickel Particles ◽  
X Zeolite
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