scholarly journals Unexpected trends in the enhanced Ce3+ surface concentration in ceria–zirconia catalyst materials

2020 ◽  
Vol 8 (19) ◽  
pp. 9850-9858 ◽  
Author(s):  
Weizi Yuan ◽  
Qing Ma ◽  
Yangang Liang ◽  
Chengjun Sun ◽  
K. V. L. V. Narayanachari ◽  
...  
Keyword(s):  
Surface Concentration ◽  
Zirconia Catalyst ◽  
Zirconium Doping

Zirconium doping has a dramatically different influence on Ce reduction in the bulk than on the surface of ceria–zirconia.

Decomposition of hydrogen peroxide on nickel-silver two-component catalyst

1984 ◽  
Vol 49 (10) ◽  
pp. 2222-2230 ◽  
Author(s):  
Viliam Múčka ◽  
Rostislav Silber
Keyword(s):  
Hydrogen Peroxide ◽  
Chemical Properties ◽  
Silver Ions ◽  
Surface Concentration ◽  
Chloride Ions ◽  
Nickel Silver ◽  
Silver Catalysts ◽  
Physico Chemical ◽  
Low Degree ◽  
Defective Crystal

The catalytic and physico-chemical properties of low-temperature nickel-silver catalysts with nickel oxide concentrations up to 43.8% (m/m) are examined via decomposition of hydrogen peroxide in aqueous solution. The mixed catalysts prepared at 250°C are composed of partly decomposed silver carbonate or oxide and nickel carbonate or hydroxide decomposed to a low degree only and exhibiting a very defective crystal structure. The activity of these catalysts is determined by the surface concentration of silver ions, which is affected by the nickel component present. The latter also contributes to the thermal stability of the catalytic centres of the silver component, viz. the Ag+ ions. The concentration of these ions varies with the temperature of the catalyst treatment, the activity varies qualitatively in the same manner, and the system approaches the Ag-NiO composition. The catalytic centres are very susceptible to poisoning by chloride ions. A previous exposition of the catalyst to a gamma dose of 10 kGy from a 60Co source has no measurable effect on the physico-chemical properties of the system.

scholarly journals Application of a Diffusion Charger for the Measurement of Particle Surface Concentration in Different Environments

2007 ◽  
Vol 41 (6) ◽  
pp. 571-580 ◽  
Author(s):  
Leonidas Ntziachristos ◽  
Andrea Polidori ◽  
Harish Phuleria ◽  
Michael D. Geller ◽  
Constantinos Sioutas
Keyword(s):  
Particle Surface ◽  
Surface Concentration ◽  
Diffusion Charger

scholarly journals Luminal surface concentration of lipoprotein (LDL) and its effect on the wall uptake of cholesterol by canine carotid arteries

1995 ◽  
Vol 21 (1) ◽  
pp. 135-145 ◽  
Author(s):  
Xiaoyan Deng ◽  
Yves Marois ◽  
Thien How ◽  
Yahye Merhi ◽  
Martin King ◽  
...  
Keyword(s):  
Carotid Arteries ◽  
Surface Concentration ◽  
Luminal Surface

Liquid Phase Hydrodechlorination of Chlorobenzene over Bimetallic Supported Zirconia Catalyst

2011 ◽  
Vol 50 (22) ◽  
pp. 12439-12448 ◽  
Author(s):  
Sujata Mallick ◽  
Surjyakanta Rana ◽  
Kulamani Parida
Keyword(s):  
Liquid Phase ◽  
Zirconia Catalyst

High-valent Zirconium-doping modified Co3O4 weave-like nanoarray boosts oxygen evolution reaction

2021 ◽  
pp. 161172
Author(s):  
Guijin Yang ◽  
Botao Zhu ◽  
Yujun Fu ◽  
Jing Zhao ◽  
Yanna Lin ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Zirconium Doping ◽  
High Valent

A Study of Novel Composite Mesoporous Zirconia Catalyst Materials

2003 ◽  
Vol 36 (10) ◽  
pp. 1212-1215 ◽  
Author(s):  
Hang-Rong Chen ◽  
Jian-Lin Shi ◽  
Lei Li ◽  
Mei-Ling Ruan ◽  
Dong-Sheng Yan
Keyword(s):  
Zirconia Catalyst ◽  
Mesoporous Zirconia

scholarly journals Ru-M (M = Fe or Co) Catalysts with high Ru surface concentration for Fischer-Tropsch synthesis

Fuel ◽  
2021 ◽  
Vol 293 ◽  
pp. 120435
Author(s):  
Dalia Liuzzi ◽  
Francisco J. Pérez-Alonso ◽  
Sergio Rojas
Keyword(s):  
Surface Concentration ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Co Catalysts

scholarly journals Long-Term Exposure to Fine and Coarse Particulate Matter and COVID-19 Incidence and Mortality Rate in Chile during 2020

2021 ◽  
Vol 18 (14) ◽  
pp. 7409
Author(s):  
Macarena Valdés Salgado ◽  
Pamela Smith ◽  
Mariel Opazo ◽  
Nicolás Huneeus
Keyword(s):  
Mortality Rate ◽  
Incidence Rate ◽  
Air Pollutants ◽  
Negative Binomial ◽  
Transport Model ◽  
Surface Concentration ◽  
Mortality Rates ◽  
Incidence And Mortality ◽  
Pm2.5 And Pm10

Background: Several countries have documented the relationship between long-term exposure to air pollutants and epidemiological indicators of the COVID-19 pandemic, such as incidence and mortality. This study aims to explore the association between air pollutants, such as PM2.5 and PM10, and the incidence and mortality rates of COVID-19 during 2020. Methods: The incidence and mortality rates were estimated using the COVID-19 cases and deaths from the Chilean Ministry of Science, and the population size was obtained from the Chilean Institute of Statistics. A chemistry transport model was used to estimate the annual mean surface concentration of PM2.5 and PM10 in a period before the current pandemic. Negative binomial regressions were used to associate the epidemiological information with pollutant concentrations while considering demographic and social confounders. Results: For each microgram per cubic meter, the incidence rate increased by 1.3% regarding PM2.5 and 0.9% regarding PM10. There was no statistically significant relationship between the COVID-19 mortality rate and PM2.5 or PM10. Conclusions: The adjusted regression models showed that the COVID-19 incidence rate was significantly associated with chronic exposure to PM2.5 and PM10, even after adjusting for other variables.

Surface concentration and microscale distribution of hydrogen and the associated embrittlement in a near α titanium alloy

2021 ◽  
Vol 862 ◽  
pp. 158669
Author(s):  
Xiaoyong Liu ◽  
Jia Wang ◽  
Lingqing Gao ◽  
Ruiwu Li ◽  
Xianfu Luo ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Surface Concentration
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