supported noble metals
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Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 487
Author(s):  
Alexandra Sandulescu ◽  
Crina Anastasescu ◽  
Florica Papa ◽  
Monica Raciulete ◽  
Anca Vasile ◽  
...  

The specific roles played by both support and noble metals in light absorption, charge separation, and the formation of ·OH and O2− (ROS) are analyzed for light-triggered oxidation of phenol (Ph) over pristine and over noble metal (Ag, Au, Pt) -loaded TiO2. Experiments show that the supported noble metals act as a light visible absorber, assist the separation of photo-charges and reduction of O2 to O2−. The O2− oxidizes mildly Ph to oxygenated products (hydroquinone, benzoquinone, and 1,2-dihydroxibenzene). In a parallel process, ·OH radicals, yielded by TiO2, mineralize Ph to CO2 by fast reaction sequences. Radical quenching and photo electrochemical measurements (surface photovoltage) confirm independently that the production of ·OH and O2− scale with oxidative conversion of Ph. The selectivity to CO2 and mild oxidation products is the result of the interplay between catalyst activity for ·OH and for O2− production.


Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 159
Author(s):  
András Erdőhelyi

The conversion of CO2 and CH4, the main components of the greenhouse gases, into synthesis gas are in the focus of academic and industrial research. In this review, the activity and stability of different supported noble metal catalysts were compared in the CO2 + CH4 reaction on. It was found that the efficiency of the catalysts depends not only on the metal and on the support but on the particle size, the metal support interface, the carbon deposition and the reactivity of carbon also influences the activity and stability of the catalysts. The possibility of the activation and dissociation of CO2 and CH4 on clean and on supported noble metals were discussed separately. CO2 could dissociate on metal surfaces, this reaction could proceed via the formation of carbonate on the support, or on the metal–support interface but in the reaction the hydrogen assisted dissociation of CO2 was also suggested. The decrease in the activity of the catalysts was generally attributed to carbon deposition, which can be formed from CH4 while others suggest that the source of the surface carbon is CO2. Carbon can occur in different forms on the surface, which can be transformed into each other depending on the temperature and the time elapsed since their formation. Basically, two reaction mechanisms was proposed, according to the mono-functional mechanism the activation of both CO2 and CH4 occurs on the metal sites, but in the bi-functional mechanism the CO2 is activated on the support or on the metal–support interface and the CH4 on the metal.


2020 ◽  
Vol 61 (51) ◽  
pp. 152630
Author(s):  
Amely Täufer ◽  
Dirk Michalik ◽  
Vu Dinh Tien ◽  
Tran Khac Vu ◽  
Markus Vogt ◽  
...  

2020 ◽  
Vol 38 (8) ◽  
pp. 819-839 ◽  
Author(s):  
Zhiquan Hou ◽  
Wenbo Pei ◽  
Xing Zhang ◽  
Kunfeng Zhang ◽  
Yuxi Liu ◽  
...  

2019 ◽  
Vol 319 ◽  
pp. 155-163 ◽  
Author(s):  
Jie Zhang ◽  
Chuang Li ◽  
Xiao Chen ◽  
Weixiang Guan ◽  
Changhai Liang

2018 ◽  
Vol 22 (12) ◽  
pp. 1628-1635 ◽  
Author(s):  
Jose Contreras-Mora ◽  
Ritubarna Banerjee ◽  
Brandon Bolton ◽  
John Valentin ◽  
John R. Monnier ◽  
...  

2018 ◽  
Vol 16 (7) ◽  
pp. 1172-1177 ◽  
Author(s):  
Guoju Yang ◽  
Thomas J. Bauer ◽  
Gary L. Haller ◽  
Eszter Baráth

A hydride transfer reaction with tertiary amines was observed in the presence of noble metals on a carbon support.


2016 ◽  
Vol 41 (31) ◽  
pp. 13485-13492 ◽  
Author(s):  
Gyula Halasi ◽  
Anita Tóth ◽  
Tamás Bánsági ◽  
Frigyes Solymosi

2015 ◽  
Vol 499 ◽  
pp. 89-100 ◽  
Author(s):  
Elżbieta Skrzyńska ◽  
Soraya Zaid ◽  
Jean-Sébastien Girardon ◽  
Mickaël Capron ◽  
Franck Dumeignil

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