Active oxygen species on Mg–La mixed oxides: the effect of Mg and La oxide interactions

2017 ◽  
Vol 7 (4) ◽  
pp. 797-801 ◽  
Author(s):  
Xianyuan Wu ◽  
Zheng Fang ◽  
Hui Pan ◽  
Yifan Zheng ◽  
Dahao Jiang ◽  
...  
Keyword(s):  
Strong Interaction ◽  
Mixed Oxide ◽  
Oxygen Vacancies ◽  
Mixed Oxides ◽  
Active Oxygen Species ◽  
Active Oxygen ◽  
Oxygen Species ◽  
Mixed Oxide Catalysts ◽  
Oxidative Reactions ◽  
Adsorbed Oxygen Species

Mg–La mixed oxide catalysts with a strong interaction between Mg and La oxides had higher amounts of oxygen vacancies and surface adsorbed oxygen species, resulting in a better performance in H2 oxidation and CH4 oxidative reactions.

scholarly journals Oxygen-vacancy-promoted catalytic wet air oxidation of phenol from MnOx–CeO2

RSC Advances ◽  
2017 ◽  
Vol 7 (43) ◽  
pp. 27079-27088 ◽  
Author(s):  
Changjian Ma ◽  
Yaoyao Wen ◽  
Qingqing Yue ◽  
Anqi Li ◽  
Jile Fu ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Vacancies ◽  
Active Oxygen Species ◽  
Active Oxygen ◽  
Phenol Oxidation ◽  
Oxygen Species ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
Oxidation Of Phenol

The presence of oxygen vacancies can promote the formation of active oxygen species, which is essential for phenol oxidation.

Analysis of the Behaviour of Different Mixed Oxides in the Treatment of Cl-VOC Containing Gas Streams

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Beatriz de Rivas ◽  
Rubén López-Fonseca ◽  
Miguel A Gutierrez-Ortiz ◽  
Jose I Gutiérrez-Ortiz
Keyword(s):  
Mixed Oxides ◽  
Active Oxygen Species ◽  
Manganese Content ◽  
Chemical Properties ◽  
Active Oxygen ◽  
Oxygen Species ◽  
Product Selectivity ◽  
Gas Streams ◽  
Physico Chemical ◽  
Catalytic Behaviour

The present work deals with the catalytic behaviour of a series of ceria and manganese-based catalysts for the deep single combustion chlorinated compounds in air. Our attention is focused on both activity and product selectivity of Ce/Zr and Mn/Zr in the oxidation of 1,2-dichloroethane (1,000 ppm) and trichloroethylene (1,000 ppm). This study also makes an attempt to establish a correlation between physico-chemical properties and catalytic performance.Both series of mixed oxides exhibited a noticeable activity in the combustion of both compounds, Ce0.5Zr0.85O2, Ce0.5Zr0.5O2 and Mn0.4Zr0.6O2 being the samples with the most promising catalysts. A remarkable acidity and readily accessible active oxygen species played a key role in determining the catalytic behaviour. As for the product selectivity, CO2, CO, HCl and Cl2 were the main products. The yield of CO2 and Cl2 was favoured as cerium or manganese content was increased. However, selectivity to chlorine was noticeably limited by the addition of stream in favour of HCl.

Ce0.80M0.12Sn0.08O2−δ (M = Hf, Zr, Pr, and La) ternary oxide solid solutions with superior properties for CO oxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 30275-30285 ◽  
Author(s):  
Damma Devaiah ◽  
Takuya Tsuzuki ◽  
Thirupathi Boningari ◽  
Panagiotis G. Smirniotis ◽  
Benjaram M. Reddy
Keyword(s):  
Co Oxidation ◽  
Oxygen Vacancies ◽  
Active Oxygen Species ◽  
High Specific Surface Area ◽  
Active Oxygen ◽  
Ternary Oxide ◽  
Oxygen Species ◽  
Oxidation Activity ◽  
Superior Surface ◽  
Surface Active

Ce0.80Pr0.12Sn0.08O2−δ combination catalyst exhibited highest CO oxidation activity owing to its high specific surface area, better reducibility, superior surface active oxygen species, and oxygen vacancies among various samples investigated.

The synergistic effect in Co–Ce oxides for catalytic oxidation of diesel soot

2015 ◽  
Vol 5 (2) ◽  
pp. 1084-1092 ◽  
Author(s):  
Guchu Zou ◽  
Yao Xu ◽  
Shujie Wang ◽  
Mingxia Chen ◽  
Wenfeng Shangguan
Keyword(s):  
Synergistic Effect ◽  
Catalytic Oxidation ◽  
Oxygen Vacancies ◽  
Active Oxygen Species ◽  
Diesel Soot ◽  
Active Oxygen ◽  
Oxygen Species ◽  
Soot Combustion ◽  
Redox Ability

Oact: active oxygen species. C*[O]: carbon–oxygen intermediate. The synergistic effect in Co–Ce catalyst leads to more oxygen vacancies and enhanced redox ability, thus assisting soot combustion.

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

Identifying the Active Oxygen Species in SnO2 Based Gas Sensing Materials: An Operando IR Spectrsocopy Study

2015 ◽  
Vol 119 (21) ◽  
pp. 11792-11799 ◽  
Author(s):  
David Degler ◽  
Susanne Wicker ◽  
Udo Weimar ◽  
Nicolae Barsan
Keyword(s):  
Gas Sensing ◽  
Active Oxygen Species ◽  
Active Oxygen ◽  
Oxygen Species ◽  
Ir Spectrsocopy

Chromosome damage caused by enzymically generated active oxygen species

1983 ◽  
Vol 18 ◽  
pp. 47
Author(s):  
B.J. Phillips ◽  
T.E.B. James ◽  
D. Anderson
Keyword(s):  
Active Oxygen Species ◽  
Active Oxygen ◽  
Chromosome Damage ◽  
Oxygen Species
Sign in / Sign up

Export Citation Format

Share Document