Synthesis and oxidation catalysis of a Ti-substituted phosphotungstate, and identification of the active oxygen species

2015 ◽  
Vol 5 (10) ◽  
pp. 4778-4789 ◽  
Author(s):  
Eri Takahashi ◽  
Keigo Kamata ◽  
Yuji Kikukawa ◽  
Sota Sato ◽  
Kosuke Suzuki ◽  
...  
Keyword(s):  
Active Oxygen Species ◽  
Catalytic Performance ◽  
Active Species ◽  
Active Oxygen ◽  
Oxidation Catalysis ◽  
Oxygen Species ◽  
Oxidation Reactions ◽  
Catalytically Active

A Ti-substituted phosphotungstate (I) showed high catalytic performance for several oxidation reactions. The truly catalytically active species was successfully isolated, and its anion structure was determined.

Mesoporous CoO-supported palladium nanocatalysts with high performance for o-xylene combustion

2018 ◽  
Vol 8 (3) ◽  
pp. 806-816 ◽  
Author(s):  
Shaohua Xie ◽  
Yuxi Liu ◽  
Jiguang Deng ◽  
Jun Yang ◽  
Xingtian Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Catalytic Combustion ◽  
Active Oxygen Species ◽  
Catalytic Performance ◽  
Active Oxygen ◽  
Oxygen Species ◽  
Highly Active ◽  
Palladium Nanocatalysts ◽  
Supported Palladium

The adsorbed o-xylene species can immediately react with active oxygen species at the highly active Pd–CoO interface between Pd NPs and meso-CoO, thus resulting in good catalytic performance of Pd/meso-CoO for o-xylene catalytic combustion.

Influence of Lattice Oxygen on the Catalytic Activity of Blue Titania Supported Pt Catalyst under CO oxidation

2021 ◽  
Author(s):  
Han Seul Choi ◽  
Jinsun Lee ◽  
Daeho Kim ◽  
Ashwani Kumar ◽  
Beomgyun Jeong ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Mechanism ◽  
Co Oxidation ◽  
Active Oxygen Species ◽  
Active Species ◽  
Active Oxygen ◽  
Pt Catalyst ◽  
Oxygen Species ◽  
Supported Tio2 ◽  
Supported Pt Catalyst

Despite enormous research into understanding the reaction mechanism for CO oxidation over transition metal supported TiO2, the active species for oxidation remains controversial. Herein, characteristics of active oxygen species of...

Promoting effects of MgO, (NH4)2SO4or MoO3modification in oxidative esterification of methacrolein over Au/Ce0.6Zr0.4O2-based catalysts

2016 ◽  
Vol 6 (14) ◽  
pp. 5453-5463 ◽  
Author(s):  
Yuchao Li ◽  
Lei Wang ◽  
Ruiyi Yan ◽  
Junxing Han ◽  
Suojiang Zhang
Keyword(s):  
Low Temperature ◽  
Significant Role ◽  
Active Oxygen Species ◽  
Catalytic Performance ◽  
Active Oxygen ◽  
Oxygen Species ◽  
Oxidative Esterification ◽  
Temperature Reduction ◽  
Low Temperature Reduction

The MgO, (NH4)2SO4or MoO3-modified Au/Ce0.6Zr0.4O2catalysts presented better catalytic performance in the oxidative esterification of MAL to MMA and the active oxygen species assigned to low-temperature reduction played a significant role.

Characterization and functional properties of new everbearing strawberry (Fragaria x ananasa Duch.) cultivar, ‘Summertiara’ berries

2014 ◽  
Vol 4 (1) ◽  
pp. 1 ◽  
Author(s):  
Takeshi Nagai ◽  
Misuzu Tamai ◽  
Masato Sato ◽  
Yasuhiro Tanoue ◽  
Norihisa Kai ◽  
...  
Keyword(s):  
Vitamin C ◽  
Sensory Evaluation ◽  
Functional Properties ◽  
Active Oxygen Species ◽  
Active Oxygen ◽  
Antihypertensive Activity ◽  
Oxygen Species ◽  
Total Anthocyanins ◽  
Strawberry Cultivar ◽  
The Stability

Background: In recent years, a new everbearing strawberry cultivar, ‘Summertiara’ was cultivated to supply the strawberries in pre-harvest season from July to October in Japan. For highly research and development of processing of this cultivar, ‘Summertiara’ berries, the objective of this study was to characterize these berries, with relation to chemical parameters, total phenols, total flavonoids, total vitamin C, and total anthocyanins, and was to investigate the solubility and the stability of anthocyanins from the berries. Moreover, the functional properties such as antioxidative activity, active oxygen species scavenging activity, and antihypertensive activity were also evaluated.Methods: Chemical analysis, colour measurement, and sensory evaluation of new everbearing strawberry cultivar, ‘Summertiara’ berries were performed. Next, the solubility of anthocyanins from the berries and stability of these against pH, temperature, and an incandescent lighting were investigated. Moreover, functional properties of the extracts prepared from berries were elucidated using 5 different methods.Results: The contents of water, proteins, lipids, carbohydrates, and ash were the same as those of other cultivar berries. The sugar-acid ratio in the berries was low; these were acidulous. By sensory evaluation, the main factors were vivid red colour, aroma, and acidity. The berries were rich in phenols, flavonoids, vitamin C, and anthocyanins. The anthocyanins of the berries became unstable by heat treatment and light exposures such as visible rays. On the other hand, the extracts prepared from the berries showed the functionalities such as antioxidant activity, active oxygen species scavenging activities, and antihypertensive activity.  Conclusions: The strawberry cultivar, ‘Summertiara’ berries were the most suitable for processing ingredient of strawberry-derived products with superior health promoting functionalities.Keywords: Summertiara, everbearing strawberry cultivar, characterization, sensory evaluation, color and storage, functional property

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