scholarly journals Hydrogen Production by Photoreforming of Renewable Substrates

2012 ◽  
Vol 2012 ◽  
pp. 1-21 ◽  
Author(s):  
Ilenia Rossetti
Keyword(s):  
Hydrogen Production ◽  
Reaction Mechanisms ◽  
Redox Reactions ◽  
Organic Molecules ◽  
Solar Light ◽  
Organic Substrates ◽  
Materials Development ◽  
Key Features

This paper focuses on the application of photocatalysis to hydrogen production from organic substrates. This process, usually called photoreforming, makes use of semiconductors to promote redox reactions, namely, the oxidation of organic molecules and the reduction of H+ to H2. This may be an interesting and fully sustainable way to produce this interesting fuel, provided that materials efficiency becomes sufficient and solar light can be effectively harvested. After a first introduction to the key features of the photoreforming process, the attention will be directed to the needs for materials development correlated to the existing knowledge on reaction mechanisms. Examples are then given on the photoreforming of alcohols, the most studied topic, especially in the case of methanol and carbohydrates. Finally, some examples of more complex but more interesting substrates, such as waste solutions, are proposed.

scholarly journals Organo-Redox-Catalysis for the difunctionalization of alkenes and oxidative Ritter reactions by C-H functionalization

2021 ◽  
Author(s):  
Martin Klussmann ◽  
Sensheng Liu
Keyword(s):  
Transition Metals ◽  
Redox Reactions ◽  
Organic Substrates ◽  
Redox Catalysis ◽  
Redox Catalysts ◽  
Oxidative Difunctionalization

Transition metals are the dominant catalysts for redox-reactions between peroxides and organic substrates. Here, we show that triarylamines can act as organic redox-catalysts, enabling oxidative difunctionalization reactions of alkenes and...

The chemistry of stabilized clusters

1982 ◽  
Vol 308 (1501) ◽  
pp. 27-34 ◽  
Keyword(s):  
Electron Donor ◽  
Organic Molecules ◽  
Metal Cluster ◽  
Organic Substrates ◽  
Insertion Reactions ◽  
Donor Ligand ◽  
Small Organic Molecules ◽  
Wide Range ◽  
Metal Metal ◽  
High Yields

Studies of the chemistry of metal cluster complexes and, in particular, their reactions with small organic molecules, have been confined to relatively few systems. Among the reasons for this are: (i) not many clusters are easily synthesized in high yields; (ii) their reactions often give a multitude of products that are difficult to separate and characterize; (iii) the conditions required to bring about reactions often lead to fragmentation of the cluster into lower nuclearity (often mononuclear) species. One cluster whose chemistry has been extensively studied is [Os 3 H 2 (CO) 10 ]. This can be synthesized in high yields from [Os 3 (CO) 12 ] + H 2 (Knox et al. 1975) and reacts readily under mild conditions with a wide range of electron-donor molecules by virtue of its coordinative unsaturation (Shapley et al. 1975; Deeming & Hasso 1976; Adams & Golembeski 1979). Formally, one may consider that a metal—metal double bond is present, which is reduced to a single bond on coordination of an additional two-electron donor ligand such as an organophosphine. The presence of metal—hydrogen bonds in this cluster and the cluster’s ability to coordinate organic substrates enable it to undergo a wide variety of insertion reactions, leading to products that may be regarded as intermediates in the reduction of organic molecules by clusters (Deeming & Hasso 1975; Keister & Shapley 1975).

Redox reactions between chromium(VI) and hydroquinone: Alternative pathways for polymerization of organic molecules

2020 ◽  
Vol 261 ◽  
pp. 114024
Author(s):  
Yu-Min Tzou ◽  
Kai-Yue Chen ◽  
Ching-Yun Cheng ◽  
Way-Zen Lee ◽  
Heng Yi Teah ◽  
...  
Keyword(s):  
Redox Reactions ◽  
Organic Molecules ◽  
Alternative Pathways ◽  
Chromium Vi

Ecofriendly hydrogen production from abundant hydrogen sulfide using solar light-driven hierarchical nanostructured ZnIn2S4 photocatalyst

2011 ◽  
Vol 13 (9) ◽  
pp. 2500 ◽  
Author(s):  
Nilima S. Chaudhari ◽  
Ashwini P. Bhirud ◽  
Ravindra S. Sonawane ◽  
Latesh K. Nikam ◽  
Sambhaji S. Warule ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Hydrogen Production ◽  
Solar Light

Hydrogen Production from Aqueous Solutions of Glycerol on TiO2/Ru-MCM-41 Photocatalysts Using Solar Light

2017 ◽  
Vol 60 (15-16) ◽  
pp. 1196-1209 ◽  
Author(s):  
Fabielle C. Marques ◽  
Maria Cristina Canela ◽  
Alexandre M. Stumbo
Keyword(s):  
Hydrogen Production ◽  
Aqueous Solutions ◽  
Solar Light ◽  
Mcm 41
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