scholarly journals Adsorption Synthesis of Iron Oxide-Supported Gold Catalyst under Self-Generated Alkaline Conditions for Efficient Elimination of Carbon Monoxide

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 357 ◽  
Author(s):  
Feng Pan ◽  
Weidong Zhang ◽  
Yuxiao Ye ◽  
Yixuan Huang ◽  
Yanzhe Xu ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Gold Catalyst ◽  
Alkaline Solutions ◽  
Support Materials ◽  
Gold Precursor ◽  
Alkaline Conditions ◽  
Supported Gold ◽  
Hydrolysis Of ◽  
Dispersed Gold ◽  
Efficient Elimination

Goethite- and hematite-supported highly dispersed gold catalysts for carbon monoxide oxidation were synthesized by gold precursor adsorption onto the support materials in self-generated alkaline solutions. The support materials were prepared by reacting iron nitrate with excess sodium hydroxide. The residual minor alkali incorporated into the support could provide suitable alkaline conditions at approximately pH 8 for the hydrolysis of tetrachloroaurate anions and the subsequent adsorption process. Gold species underwent autoreduction to achieve activation during the synthesis. An increase in pH or temperature to 80 °C decreased the gold loading of the catalysts. The optimal catalysts could achieve complete oxidation of carbon monoxide at −20 °C.

scholarly journals Electroless deposition of Fe-Ni alloys from acidic and alkaline solutions using hypophosphite as a reducing agent

2019 ◽  
Vol 84 (11) ◽  
pp. 1199-1208
Author(s):  
Stojan Djokic ◽  
Zeljka Antic ◽  
Nada Djokic ◽  
Thomas Thundat
Keyword(s):  
Electroless Deposition ◽  
Amorphous Structure ◽  
Reducing Agent ◽  
Experimental Results ◽  
Alkaline Solutions ◽  
Acidic Solutions ◽  
Ni Alloys ◽  
Alkaline Conditions ◽  
Temperature Deposition ◽  
Hydrolysis Of

The deposition of Fe?Ni alloys from acidic and alkaline solutions, using hypophosphite as a reducing agent, is studied in this work. The experimental results confirm the autocatalytic nature of this process. The composition of alloys is practically independent of the temperature deposition. Fe?Ni alloys produced from acidic solutions contained less than 1% Fe. The amount of Fe in Fe?Ni alloys produced from alkaline solutions was estimated to be about 15 %. The deposition of Fe?Ni alloys was significantly faster in the alkaline than in the acidic solutions, due to more pronounced hydrolysis of Fe(II) and Ni(II) ions under the alkaline conditions. The Fe?Ni alloys produced from both acidic and alkaline solutions contain phosphorus and as such have amorphous structure.

Preparation, Characterization and Catalytic Activity of Highly Dispersed Gold Catalyst

2014 ◽  
Vol 875-877 ◽  
pp. 304-307 ◽  
Author(s):  
Chun Xiu Liu ◽  
Mei Lin Jia ◽  
Yu Hong Bao ◽  
Jiang Wang ◽  
Sagala ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Gluconic Acid ◽  
Reduction Method ◽  
Gold Catalyst ◽  
Buffer Solution ◽  
Supported Gold Catalysts ◽  
Highly Dispersed ◽  
Supported Gold ◽  
Oxidation Of Glucose ◽  
Dispersed Gold

Highly dispersed supported gold catalysts have been prepared by solution reduction method using L-lysine as protection agents, and their catalytic activity was evaluated by the liquid phase catalytic oxidation reaction of glucose to gluconic acid. The results suggested that the Au/ZrO2 catalyst, exhibited high activity for the selective oxidation of glucose. At the reaction temperature of 323K, reaction time of 1h, with the NaCO3-NaHCO3 as buffer solution, the yield of gluconic acid was 100%.

Oxidation of Carbon Monoxide over a Fibrous Titania-Supported Gold Catalyst

2009 ◽  
Vol 30 (5) ◽  
pp. 421-425 ◽  
Author(s):  
Yinhua ZHU ◽  
Shanshan CHEN ◽  
Xiaohua LU ◽  
Zhuhong YANG ◽  
Xin FENG ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Gold Catalyst ◽  
Supported Gold ◽  
Oxidation Of Carbon Monoxide

scholarly journals A Study of Catechin Photostability Using Photolytic Processing

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 293
Author(s):  
Jeu-Ming P. Yuann ◽  
Shwu-Yuan Lee ◽  
Meei-Ju Yang ◽  
Shiuh-Tsuen Huang ◽  
Chien-Wei Cheng ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Alkaline Solutions ◽  
Light Illumination ◽  
Drug Resistant ◽  
Alkaline Ph ◽  
Radical Species ◽  
Alkaline Conditions ◽  
Photolytic Reaction

Catechin exhibits numerous physiological characteristics. In this study, we determined the photosensitivity of catechin to various lights under alkaline conditions, and the mechanisms by which catechin generates free radical species and polymerizes via a photoreaction. In addition to this, the application of catechin photolysis was investigated. A solution of catechin is transparent, but turns yellowish under blue light illumination (BLI) in neutral or weak alkaline solutions. When catechin is subjected to BLI, a dimeric catechin (proanthocyanidin) and a superoxide anion radical (O2•−) are generated in a photolytic reaction. When ascorbic acid or gallic acid is added to catechin and the mixture is subjected to BLI at alkaline pH, fewer catechin dimers and less O2•− are produced, because both acids inhibit the photosensitive oxidation of catechin. When AlCl3 is added to catechin and the mixture is subjected to BLI at pH 8, a photolytic reaction is suppressed by AlCl3, and AlCl3 acts as a catalyst for the disconnection of proanthocyanidin during photolysis. Under alkaline conditions, catechin generates O2•− via photosensitive oxidation, which suppresses the growth of Acinetobacter baumannii (A. baumannii) by at least 4 logs, and deactivates its multi-drug-resistant strain. This study shows that catechin photolysis is a process of oxidation, and that it can be safely applied as a tool for environmental applications.

Selective acid hydrolysis of 2,4,6-trimethylbenzyl esters and its application in peptide synthesis

1966 ◽  
Vol 19 (8) ◽  
pp. 1511 ◽  
Author(s):  
FHC Stewart
Keyword(s):  
Acid Hydrolysis ◽  
Peptide Synthesis ◽  
Trifluoroacetic Acid ◽  
Ester Group ◽  
Protecting Groups ◽  
Alkaline Conditions ◽  
Hydrolysis Of

Experiments with various N-acylamino acid 2,4,6-trimethylbenzyl esters have shown that the ester group is cleaved selectively by cold trifluoroacetic acid without affecting benzyloxycarbonyl, formyl, or phthaloyl amino-protecting groups present. The possible value of this selective behaviour in peptide syntheses where the use of alkaline conditions would be detrimental is illustrated by the synthesis of certain dipeptide derivatives.

A kinetic study of the hydrolysis of 2-germaacetate in neutral and alkaline solutions

1977 ◽  
Vol 16 (11) ◽  
pp. 2834-2837 ◽  
Author(s):  
Duck J. Yang ◽  
William L. Jolly
Keyword(s):  
Kinetic Study ◽  
Alkaline Solutions ◽  
Hydrolysis Of

Supported gold catalysts for the total oxidation of alkanes and carbon monoxide

2006 ◽  
Vol 312 ◽  
pp. 67-76 ◽  
Author(s):  
B SOLSONA ◽  
T GARCIA ◽  
C JONES ◽  
S TAYLOR ◽  
A CARLEY ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Gold Catalysts ◽  
Total Oxidation ◽  
Supported Gold Catalysts ◽  
Supported Gold
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