Visible‐Light Direct Conversion of Ethanol to 1,1‐Diethoxyethane and Hydrogen over a Non‐Precious Metal Photocatalyst

2018 ◽  
Vol 25 (1) ◽  
pp. 189-194 ◽  
Author(s):  
Yuguang Chao ◽  
Wenqin Zhang ◽  
Xuemei Wu ◽  
Nana Gong ◽  
Zhihong Bi ◽  
...  
Keyword(s):  
Visible Light ◽  
Precious Metal ◽  
Direct Conversion

Visible light-induced direct conversion of aldehydes into nitriles in aqueous medium using Co@g-C3N4 as photocatalyst

2019 ◽  
Vol 119 ◽  
pp. 76-81 ◽  
Author(s):  
Fooleswar Verma ◽  
Prashant Shukla ◽  
Smita R. Bhardiya ◽  
Manorama Singh ◽  
Ankita Rai ◽  
...  
Keyword(s):  
Visible Light ◽  
Aqueous Medium ◽  
Direct Conversion

scholarly journals Light-Driven Depolymerization of Native Lignin Enabled by Proton- Coupled Electron Transfer

2019 ◽  
Author(s):  
Suong Nguyen ◽  
Phillip Murray ◽  
Robert Knowles
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Bond Cleavage ◽  
Direct Conversion ◽  
Alkoxy Radical ◽  
Radical Intermediate ◽  
Polymer Backbone ◽  
Good Efficiency ◽  
Chemical Reagents ◽  
Proton Coupled Electron Transfer

<div><p>Here we report a catalytic, light-driven method for the redox-neutral depolymerization of native lignin biomass at ambient temperature. This transformation proceeds via a proton-coupled electron-transfer (PCET) activation of an alcohol O–H bond to generate a key alkoxy radical intermediate, which then drives the <i>β</i>-scission of a vicinal C–C bond. Notably, this depolymerization is driven solely by visible light irradiation, requiring no stoichiometric chemical reagents and producing no stoichiometric waste. This method exhibits good efficiency and excellent selectivity for the activation and fragmentation of <i>β</i>-O-4 linkages in the polymer backbone, even in the presence of numerous other PCET-active functional groups. DFT analysis suggests that the key C–C bond cleavage reactions produce non-equilibrium product distributions, driven by excited-state redox events. These results provide further evidence that visible-light photocatalysis can serve as a viable method for the direct conversion of lignin biomass into valuable arene feedstocks.</p></div>

scholarly journals ZnSe quantum dots modified with a Ni(cyclam) catalyst for efficient visible-light driven CO2 reduction in water

2018 ◽  
Vol 9 (9) ◽  
pp. 2501-2509 ◽  
Author(s):  
Moritz F. Kuehnel ◽  
Constantin D. Sahm ◽  
Gaia Neri ◽  
Jonathan R. Lee ◽  
Katherine L. Orchard ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Phosphonic Acid ◽  
Precious Metal ◽  
Co2 Reduction ◽  
Metal Free ◽  
Efficient Reduction ◽  
Ligand Free ◽  
Visible Light Driven

A robust precious metal-free photocatalyst system comprised of ligand-free ZnSe quantum dots and a phosphonic acid-functionalised Ni(cyclam) catalyst achieves efficient reduction of aqueous CO2 to CO.

Visible Light Photocatalyzed Direct Conversion of Aryl-/Heteroarylamines to Selenides at Room Temperature

2014 ◽  
Vol 16 (6) ◽  
pp. 1814-1817 ◽  
Author(s):  
Debasish Kundu ◽  
Sabir Ahammed ◽  
Brindaban C. Ranu
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Direct Conversion

scholarly journals [FeFe] Hydrogenase based Prototype Photosensitizer-Catalyst Dyad for Hydrogen Generation under Visible Light

2021 ◽  
Author(s):  
Philipp Buday ◽  
Chizuru Kasahara ◽  
Elisabeth Hofmeister ◽  
Daniel Kowalczyk ◽  
Michael K. Farh ◽  
...  
Keyword(s):  
Visible Light ◽  
Precious Metal ◽  
Hydrogen Generation ◽  
Theoretical Calculations ◽  
Electrochemical Techniques ◽  
Time Resolved ◽  
Metal Free ◽  
Pi Conjugated ◽  
Visible Light Driven ◽  
Light Absorbers

Inspired by the active center of the natural [FeFe] hydrogenases, we designed a compact and precious metal-free photosensitizer-catalyst dyad (PS-CAT) for photocatalytic hydrogen evolution under visible light irradiation. PS-CAT represents a prototype dyad comprising pi-conjugated oligothiophenes as light absorbers. PS-CAT and its interaction with the sacrificial donor 1,3-dimethyl-2-phenylbenzimidazoline were studied by steady-state and time-resolved spectroscopy coupled with electrochemical techniques and visible light-driven photocatalytic investigations. Operando EPR spectroscopy revealed the formation of an active [Fe(I)Fe(0)] species – in accordance with theoretical calculations – presumably driving photocatalysis effectively (TON ≈ 210).

Highly efficient visible-light-driven catalytic hydrogen evolution from ammonia borane using non-precious metal nanoparticles supported by graphitic carbon nitride

2017 ◽  
Vol 5 (5) ◽  
pp. 2288-2296 ◽  
Author(s):  
Hao Zhang ◽  
Xiaojun Gu ◽  
Penglong Liu ◽  
Jin Song ◽  
Jia Cheng ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Nanoparticles ◽  
Hydrogen Evolution ◽  
Electron Density ◽  
Precious Metal ◽  
Carbon Nitride ◽  
Room Temperature ◽  
Visible Light Driven ◽  
Catalytic Hydrogen ◽  
Catalytic Hydrogen Evolution

Through enriching the electron density of metal nanoparticles, the non-precious catalysts exhibited ultra-high visible-light-driven activities in room-temperature hydrogen evolution from NH3BH3.

scholarly journals Light-Driven Depolymerization of Native Lignin Enabled by Proton- Coupled Electron Transfer

2019 ◽  
Author(s):  
Suong Nguyen ◽  
Phillip Murray ◽  
Robert Knowles
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Bond Cleavage ◽  
Direct Conversion ◽  
Alkoxy Radical ◽  
Radical Intermediate ◽  
Polymer Backbone ◽  
Good Efficiency ◽  
Chemical Reagents ◽  
Proton Coupled Electron Transfer

<div><p>Here we report a catalytic, light-driven method for the redox-neutral depolymerization of native lignin biomass at ambient temperature. This transformation proceeds via a proton-coupled electron-transfer (PCET) activation of an alcohol O–H bond to generate a key alkoxy radical intermediate, which then drives the <i>β</i>-scission of a vicinal C–C bond. Notably, this depolymerization is driven solely by visible light irradiation, requiring no stoichiometric chemical reagents and producing no stoichiometric waste. This method exhibits good efficiency and excellent selectivity for the activation and fragmentation of <i>β</i>-O-4 linkages in the polymer backbone, even in the presence of numerous other PCET-active functional groups. DFT analysis suggests that the key C–C bond cleavage reactions produce non-equilibrium product distributions, driven by excited-state redox events. These results provide further evidence that visible-light photocatalysis can serve as a viable method for the direct conversion of lignin biomass into valuable arene feedstocks.</p></div>

Cobalt phosphide as a highly active non-precious metal cocatalyst for photocatalytic hydrogen production under visible light irradiation

2015 ◽  
Vol 3 (11) ◽  
pp. 6096-6101 ◽  
Author(s):  
Shuang Cao ◽  
Yong Chen ◽  
Chun-Chao Hou ◽  
Xiao-Jun Lv ◽  
Wen-Fu Fu
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Precious Metal ◽  
Mandelic Acid ◽  
Light Irradiation ◽  
Acidic Media ◽  
Cobalt Phosphide ◽  
Highly Active

Co2P nanoparticles were applied to photocatalytic hydrogen evolution in aqueous acidic media, and simultaneously, dl-mandelic acid was transformed into benzoylformic acid.

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