scholarly journals Selective hydrogenation of nitroarenes using an electrogenerated polyoxometalate redox mediator

2018 ◽  
Vol 54 (9) ◽  
pp. 1093-1096 ◽  
Author(s):  
Lewis MacDonald ◽  
Benjamin Rausch ◽  
Mark D. Symes ◽  
Leroy Cronin
Keyword(s):  
Selective Hydrogenation ◽  
Redox Mediator ◽  
Reduced Form ◽  
Silicotungstic Acid ◽  
Co Catalyst

The 2-electron reduced form of the polyoxometalate silicotungstic acid (H4[SiW12O4]) is shown to be an effective and selective hydrogenation agent for a range of nitroarenes without the need for any co-catalyst.

scholarly journals Efficient Electrochemical Reduction of CO2 to Formate in Methanol Solutions by Mn Functionalized Electrodes in the Presence of Amines

2021 ◽  
Author(s):  
Francesca Marocco Studardi ◽  
Arianna Tiozzo ◽  
Laura Rotundo ◽  
Roberto Gobetto ◽  
Carlo Nervi ◽  
...  
Keyword(s):  
Liquid Fuel ◽  
Reduced Form ◽  
Carbon Cloth ◽  
Co Catalyst ◽  
Methanol Solutions ◽  
Covalently Bonded ◽  
Electrochemical Mechanism ◽  
Reduction Of Co2 ◽  
Organometallic Catalyst ◽  
Shed Light

Carbon cloth electrode modified by covalently attaching a manganese organometallic catalyst is used as cathode for the electrochemical recuction of CO2 in methanol solutions. Six different amines are employed as co-catalyst in millimolar concentrations, which coupled to the increased solubility of CO2 in methanol enhance the formate production, switch the selectivity toward formate anion, and in the case of pentamethyldiethylentriamine (PMDETA) resulted in an impressive TONHCOO– of 2.8×104. We demonstrate that the protonated PMDETA is formed in methanol solution by simply bubbling CO2, which is the responsible for a barrierless transformation of CO2 to formate via the reduced form of the Mn catalyst covalently bonded to the electrode surface. These findings pave the way for more efficient transformation of CO2 into liquid fuel and shed light on the electrochemical mechanism

scholarly journals Selective Hydrogenation of Sucrose into Sugar Alcohols over Supported Raney Nickel-Based Catalysts

2019 ◽  
Vol 19 (1) ◽  
pp. 183 ◽  
Author(s):  
Rodiansono Rodiansono ◽  
Maria Dewi Astuti ◽  
Dwi Rasy Mujiyanti ◽  
Uripto Trisno Santoso
Keyword(s):  
Selective Hydrogenation ◽  
High Performance ◽  
High Dispersion ◽  
Sugar Alcohols ◽  
Ni Catalysts ◽  
Co Catalyst ◽  
Amberlyst 15 ◽  
Raney Ni ◽  
Crystallite Sizes ◽  
Supporting Materials

Selective hydrogenation of sugars (e.g. sucrose, cellobiose, glucose, fructose, xylose, arabinose) into sugar alcohols (sorbitol, mannitol, xylitol, arabitol) can be achieved by means of supported Raney Ni-based catalysts. Various supporting materials such as the layered structure of clay (e.g. bentonite, taeniolite, smectite), metal oxides (e.g. Nb2O5, ZrO2, Al2O3), and conventional supports (e.g. carbon, silica, zeolite (JRC-SZ1)) were employed to obtain high performance of supported Raney Ni-based catalysts. The conventional Raney Ni, Raney Ni/AlOH, and Ni-NP with relatively high dispersion exhibited superior catalytic activity compared with the various supported Raney Ni catalysts with the conversion of 100% and hexitols selectivity almost ~99%. The H2 treatment of Raney Ni/SMT at a temperature of 473–773 K caused the increase in Ni(111) crystallite sizes as the conversion of sucrose with compromised decreased of hexitols product. The presence of acidic co-catalyst such as SnO, amberlyst-15, JRC-SZ1, JRC-Z5-9OH1 on Raney Ni/AlOH catalyst significantly enhanced the formation of glycerol product even though the conversion of sucrose compromised decreased owing to the partial leaching of Ni metal into the reaction mixture.

Air atmospheric photocatalytic oxidation by ultrathin C,N-TiO2 nanosheets

2021 ◽  
Vol 23 (3) ◽  
pp. 1165-1170
Author(s):  
Xiuyan Cheng ◽  
Jianling Zhang ◽  
Lifei Liu ◽  
Lirong Zheng ◽  
Fanyu Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Photocatalytic Oxidation ◽  
Redox Mediator ◽  
Co Catalyst ◽  
Mild Conditions ◽  
Tio2 Nanosheets

Here we propose the high-performance photocatalytic oxidation of thioanisole under mild conditions (air and 25 °C under sacrificial reagent-, co-catalyst- and redox mediator-free conditions) using ultrathin C,N-TiO2 nanosheets.

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