scholarly journals Hydrogen Passivation of M–N–C (M = Fe, Co) Catalysts for Storage Stability and ORR Activity Improvements (Adv. Mater. 38/2021)

2021 ◽  
Vol 33 (38) ◽  
pp. 2170300
Author(s):  
Jieyuan Liu ◽  
Xin Wan ◽  
Shiyuan Liu ◽  
Xiaofang Liu ◽  
Lirong Zheng ◽  
...  
Keyword(s):  
Storage Stability ◽  
Hydrogen Passivation ◽  
Co Catalysts ◽  
Orr Activity

Hydrogen Passivation of M–N–C (M = Fe, Co) Catalysts for Storage Stability and ORR Activity Improvements

2021 ◽  
pp. 2103600
Author(s):  
Jieyuan Liu ◽  
Xin Wan ◽  
Shiyuan Liu ◽  
Xiaofang Liu ◽  
Lirong Zheng ◽  
...  
Keyword(s):  
Storage Stability ◽  
Hydrogen Passivation ◽  
Co Catalysts ◽  
Orr Activity

STUDY ON DEVELOPMENT OF PASTA PRODUCT WITH INCORPORATION OF OCIMUM SANCTUM (BASIL) TO ENHANCE THE SENSORY AND NUTRITIONAL QUALITY

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
PIYUSH MISHRA ◽  
DEVENDRA KUMAR BHATT
Keyword(s):  
Ambient Temperature ◽  
Shelf Life ◽  
Nutritional Quality ◽  
Leaf Extract ◽  
Storage Stability ◽  
Natural Antioxidants ◽  
Sensory Properties ◽  
Ocimum Sanctum ◽  
Leaf Powder

Pasta was prepared by incorporation of Ocimum sanctum (Basil) for better textural and sensory properties. The pasta was incorporated with the leaf extract of Ocimum sanctum at different concentrations of control, 5, 10, and 15.The natural antioxidants present in the O. sanctum leaf powder that was incorporated in the fruit leather showed extended shelf-life over three months when compared with control, without any added preservative at ambient temperature. Also the nutritional stability of the product was studied under two flexible packages of polypropylene and polyester out of that the products packed in polypropylene showed better storage stability .

Hydrogen passivation of defect levels in the annealed CdZnTe:In crystals

2020 ◽  
Vol 35 (22) ◽  
pp. 3041-3047
Author(s):  
Lingyan Xu ◽  
Yan Zhou ◽  
Xu Fu ◽  
Lu Liang ◽  
Wanqi Jie
Keyword(s):  
Hydrogen Passivation ◽  
Defect Levels

Abstract

Bimetallic Radical Redox-Relay Catalysis for the Isomerization of Epoxides to Allylic Alcohols

2019 ◽  
Author(s):  
Ke-Yin Ye ◽  
Terry McCallum ◽  
Song Lin
Keyword(s):  
Ring Opening ◽  
High Reactivity ◽  
Hydrogen Atom Transfer ◽  
Organic Radicals ◽  
Epoxide Ring ◽  
Allylic Alcohols ◽  
Epoxide Ring Opening ◽  
Bond Forming ◽  
Co Catalysts ◽  
The Rich

Organic radicals are generally short-lived intermediates with exceptionally high reactivity. Strategically, achieving synthetically useful transformations mediated by organic radicals requires both efficient initiation and selective termination events. Here, we report a new catalytic strategy, namely bimetallic radical redox-relay, in the regio- and stereoselective rearrangement of epoxides to allylic alcohols. This approach exploits the rich redox chemistry of Ti and Co complexes and merges reductive epoxide ring opening (initiation) with hydrogen atom transfer (termination). Critically, upon effecting key bond-forming and -breaking events, Ti and Co catalysts undergo proton-transfer/electron-transfer with one another to achieve turnover, thus constituting a truly synergistic dual catalytic system.<br>

Studies on the storage stability of white beet sugar depending on its quality

2018 ◽  
pp. 581-589
Author(s):  
Philipp Bruhns ◽  
Timo Koch ◽  
Lothar Kroh
Keyword(s):  
Storage Stability ◽  
Crystal Surface ◽  
Surface Film ◽  
Quality Criteria ◽  
Color Distribution ◽  
Color Formation ◽  
Beet Sugar ◽  
Council Directive ◽  
Thick Juice ◽  
White Sugar

Storage stability of white beet sugar is an important factor determining the sugar quality. Due to color formation during storage the sugar color can exceed the quality criteria of the European council directive 2001/111/EC for white sugar. It is not possible to predict the color formation tendency of a white sugar lot at the time of its production. Also the source and the mechanism of color formation during storage are unknown. Color formation in general can be caused by several factors, which can be divided into external influences such as humidity and temperature during storage and internal causes such as contents of ash, polyphenols, mono- and oligosaccharides, and amino compounds. In this work, the effect of the above mentioned factors and the nature of the formed colorants were analyzed. Studies on the color distribution in sugar crystals were carried out and the nonsucrose compounds in the surface film were determined. The syrup film on the crystal surface contains the same compounds and in similar contents as thick juice. A correlation between the changes in the amino acid and monosaccharide content and the color formation was established, which shows that the Maillard reaction is responsible for the color development during storage of sugar.

Effects of Greek Pomegranate Extracts in the Antioxidant Properties and Storage Stability of Kefir

2019 ◽  
Vol 15 (4) ◽  
pp. 437-441 ◽  
Author(s):  
Vasiliki Lagouri ◽  
Georgia Dimitreli ◽  
Aikatarini Kouvatsi
Keyword(s):  
Antioxidant Activity ◽  
Dairy Products ◽  
Storage Time ◽  
Storage Stability ◽  
Flow Behavior ◽  
Antioxidant Properties ◽  
Flow Behavior Index ◽  
Ph Values ◽  
Dpph Activity ◽  
Behavior Index

Background: Oxidation reactions are known to shorten the shelf life and cause damage to foods rich in fat, such as dairy products. One way to limit oxidation and increase the shelf life of fermented dairy products is to use natural antioxidants. The aim of this study was to examine the effect of adding pomegranate extracts in the antioxidant properties, rheological characteristics and the storage stability of the fermented product of kefir. Methods: The Pomegranate Juice (PGJ) and Peel Extracts (PGPE) (5%, 10% w/v) were added to kefir and the antioxidant properties were evaluated by using the methods of radical scavenging activity (DPPH) and Ferric Reducing Antioxidant Power Activity (FRAP). Spectrophotometric and instrumental methods were used to determine the Total Phenols (TPs), pH values, viscosity and flow behavioral index values of enriched with pomegranate kefir samples. The same properties were tested when kefir samples stored at 4°C for 7, 14, 21 and 28 days. Results: The addition of PGJ and PGPE results in an increase in the antioxidant activity (DPPH, FRAP) and total phenol content (TPs) of kefir samples. Increasing the concentration of the added PGJ and PGPE, results in an increase in the TP content and the DPPH activity of kefir. As far as the storage time is concerned, the results showed an increase in the amount of TP at 7th day and a reduction in the DPPH activity in the 14th day of storage. In contrary to the DPPH method, the increase in storage time has resulted in a reduction in antioxidant activity by the FRAP method. The addition of PGJ and PGPE in kefir results in a decrease in pH values while the pH of kefir samples increased during storage at 4°C for 28 days. The addition of PGJ and PGPE to kefir samples results to a decrease in viscosity and an increase in the flow behavior index. Increasing storage time results in increased flow behavior index of kefir samples. Conclusion: The addition of PGJ and PGPE increased the antioxidant activity and total phenols of the kefir product and preserved its properties during the total storage time of 28 days at 4°C.

Superior co-catalysis by bimetallic nanostructure for TiO2 photocatalysis

2020 ◽  
Vol 01 ◽  
Author(s):  
Bonamali Pal ◽  
Anila Monga ◽  
Aadil Bathla
Keyword(s):  
Visible Light ◽  
Catalytic Performance ◽  
Transition Metal Catalysts ◽  
Core Shell ◽  
Structural Morphology ◽  
Tio2 Photocatalysis ◽  
Co Catalysts ◽  
Bimetallic Nanocomposites ◽  
Bimetallic Nanostructure ◽  
Bimetallic Nanostructures

Background:: Bimetallic nanocomposites have currently gained significant importance for enhanced catalytic applications relative to monometallic analogues. The synergistic interactions modified electronic and optical properties in the bimetallic (M1@M2) structural morphology e.g., core-shell /alloy nanostructures resulted in a better co-catalytic performance for TiO2 photocatalysis. Objective:: Hence, this article discusses the preparation, characterization, and co-catalytic activity of different bimetallic nanostructures namely, Cu@Zn, Pd@Au, Au@Ag, and Ag@Cu, etc. Method:: These bimetallic co-catalysts deposited on TiO2 possess the ability to absorb visible light due to surface plasmonic absorption and are also expected to display the new properties due to synergy between two distinct metals. As a result, they reveal the highest level of activity than the monometal deposited TiO2. Result:: Their optical absorption, emission, charge carrier dynamics, and surface structural morphology are explained for the improved photocatalytic activity of M1@M2 loaded TiO2 for the hydrogenation of certain organic compounds e.g., quinoline, crotonaldehyde, and 1,3-dinitrobenzene, etc. under UV/ visible light irradiation. Conclusion:: It revealed that the use of bimetallic core@shell co-catalyst for hydrogenation of important industrial organics by M1@M2-TiO2 nanocomposite demonstrates beneficial reactivity in many instances relative to conventional transition metal catalysts.

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