scholarly journals Highly efficient ethylene production via electrocatalytic hydrogenation of acetylene under mild conditions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Suheng Wang ◽  
Kelechi Uwakwe ◽  
Liang Yu ◽  
Jinyu Ye ◽  
Yuezhou Zhu ◽  
...  
Keyword(s):  
Ethylene Production ◽  
High Efficiency ◽  
Ambient Pressure ◽  
Industrial Process ◽  
Electrocatalytic Hydrogenation ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Cu Catalyst

AbstractRenewable energy-based electrocatalytic hydrogenation of acetylene to ethylene (E-HAE) under mild conditions is an attractive substitution to the conventional energy-intensive industrial process, but is challenging due to its low Faradaic efficiency caused by competitive hydrogen evolution reaction. Herein, we report a highly efficient and selective E-HAE process at room temperature and ambient pressure over the Cu catalyst. A high Faradaic efficiency of 83.2% for ethylene with a current density of 29 mA cm−2 is reached at −0.6 V vs. the reversible hydrogen electrode. In-situ spectroscopic characterizations combined with first-principles calculations reveal that electron transfer from the Cu surface to adsorbed acetylene induces preferential adsorption and hydrogenation of the acetylene over hydrogen formation, thus enabling a highly selective E-HAE process through the electron-coupled proton transfer mechanism. This work presents a feasible route for high-efficiency ethylene production from E-HAE.

Unprecedentedly high efficiency for photocatalytic conversion of methane to methanol over Au–Pd/TiO2 – what is the role of each component in the system?

2021 ◽  
Author(s):  
Xiaojiao Cai ◽  
Siyuan Fang ◽  
Yun Hang Hu
Keyword(s):  
Methane Conversion ◽  
High Efficiency ◽  
Mild Conditions ◽  
Highly Efficient ◽  
System P ◽  
Conversion Of Methane

Direct and highly efficient methane conversion to methanol under mild conditions is achieved via photocatalysis over Au–Pd/TiO2.

scholarly journals A Pd/MnO2 Electrocatalyst for Nitrogen Reduction to Ammonia under Ambient Conditions

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 802
Author(s):  
Chang Sun ◽  
Yingxin Mu ◽  
Yuxin Wang
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Pd Nanoparticles ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Transmission Electron ◽  
Alternative Approach ◽  
Supported Pd

Electrochemical ammonia synthesis, which is an alternative approach to the Haber–Bosch process, has attracted the attention of researchers because of its advantages including mild working conditions, environmental protection, and simple process. However, the biggest problem in this field is the lack of high-performance catalysts. Here, we report high-efficiency electroreduction of N2 to NH3 on γ-MnO2-supported Pd nanoparticles (Pd/γ-MnO2) under ambient conditions, which exhibits excellent catalytic activity with an NH3 yield rate of 19.72 μg·mg−1Pd h−1 and a Faradaic efficiency of 8.4% at −0.05 V vs. the reversible hydrogen electrode (RHE). X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterization shows that Pd nanoparticles are homogeneously dispersed on the γ-MnO2. Pd/γ-MnO2 outperforms other catalysts including Pd/C and γ-MnO2 because of its synergistic catalytic effect between Pd and Mn.

Electrocatalytic hydrogenation of benzoic acids in a proton-exchange membrane reactor

2021 ◽  
Author(s):  
Atsushi Fukazawa ◽  
Yugo Shimizu ◽  
Naoki Shida ◽  
Mahito Atobe
Keyword(s):  
Membrane Reactor ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Benzoic Acids ◽  
Electrocatalytic Hydrogenation ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Exchange Membrane

The highly efficient chemoselective electrocatalytic hydrogenation of benzoic acids (BAs) to cyclohexanecarboxylic acids (CCAs) was carried out in a proton-exchange membrane reactor under mild conditions without hydrogenation of the carboxyl...

Highly efficient hydrogen evolution from seawater by a low-cost and stable CoMoP@C electrocatalyst superior to Pt/C

2017 ◽  
Vol 10 (3) ◽  
pp. 788-798 ◽  
Author(s):  
Yuan-Yuan Ma ◽  
Cai-Xia Wu ◽  
Xiao-Jia Feng ◽  
Hua-Qiao Tan ◽  
Li-Kai Yan ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
High Efficiency ◽  
Low Cost ◽  
Faradaic Efficiency ◽  
Highly Efficient

A low-cost CoMoP@C electrocatalyst exhibits high efficiency and stable HER performance superior to commercial 20% Pt/C, and can directly work in seawater for the HER with a Faradaic efficiency of 92.5%.

Dendritic Cu: a high-efficiency electrocatalyst for N2 fixation to NH3 under ambient conditions

2019 ◽  
Vol 55 (96) ◽  
pp. 14474-14477 ◽  
Author(s):  
Chengbo Li ◽  
Shiyong Mou ◽  
Xiaojuan Zhu ◽  
Fengyi Wang ◽  
Yuting Wang ◽  
...  
Keyword(s):  
N2 Fixation ◽  
High Efficiency ◽  
Reversible Hydrogen Electrode ◽  
Ambient Conditions ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Yield Rate

Dendritic Cu behaves as an efficient electrocatalyst for ambient N2-to-NH3 fixation with a high Faradaic efficiency of 15.12% and a large NH3 yield rate of 25.63 μg h−1 mgcat.−1 at −0.40 V versus reversible hydrogen electrode in 0.1 M HCl.

scholarly journals Selective hydroxylation of aryl iodides to produce phenols under mild conditions using a supported copper catalyst

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25348-25353
Author(s):  
Leiduan Hao ◽  
Anika Auni ◽  
Guodong Ding ◽  
Xiaoyu Li ◽  
Haiping Xu ◽  
...  
Keyword(s):  
Copper Catalyst ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Aryl Iodides ◽  
Cu Catalyst ◽  
Supported Copper Catalyst ◽  
Selective Hydroxylation

Atomically dispersed Cu catalyst was designed for highly efficient hydroxylation of aryl iodides under mild conditions.

scholarly journals Improved electrochemical conversion of CO2 to multicarbon products by using molecular doping

2021 ◽  
Author(s):  
Huali WU ◽  
Ji Li ◽  
Kun Qi ◽  
Yang Zhang ◽  
Eddy Petit ◽  
...  
Keyword(s):  
High Efficiency ◽  
Reaction Pathway ◽  
Reaction Rates ◽  
Reduction Reaction ◽  
Reaction Products ◽  
Faradaic Efficiency ◽  
Cu Catalyst ◽  
Cell Energy ◽  
Current Densities ◽  
Novel Strategy

Abstract The conversion of CO2 into desirable multicarbon products such as ethylene and ethanol via the carbon dioxide reduction reaction (CO2RR) hold promise to achieve a circular carbon economy. The develop of such a technology is currently hampered by the lack of catalysts, which can drive the reaction at industrially relevant current densities with high efficiency and selectivity. Here, we report a novel strategy for increasing the conversion of CO2 into hydrocarbon molecules with two or more carbon atoms (C2+) by modifying the surface of bimetallic silver-copper (Ag-Cu) catalyst with aromatic heterocycles such as thiadiazole and triazole derivatives. By combining operando Raman and X-ray absorption spectroscopy with electrocatalytic measurements and analysis of the reaction products, we identified that the electron withdrawing nature of functional groups orients the reaction pathway towards the production of C2+ species such as ethanol and ethylene and enhances the reaction rates on the surface of the catalyst. As a result, we achieve a maximum Faradaic efficiency for the formation of C2+ of ≈ 80% and full-cell energy efficiency of 20.3% with a specific current density of 261.4 mA cm-2 for C2+ using functionalized Ag-Cu electrodes, compared to only 33.8% and 70.6 mA cm-2 for the pristine Ag-Cu electrodes. We anticipate that our strategy can further be extended in order to improve the selectivity of the reaction towards the production of specific multicarbon molecules.

scholarly journals Electrocatalytic hydrogenation of guaiacol in diverse electrolytes using a slurry reactor

2019 ◽  
Author(s):  
Yanuar Philip Wijaya
Keyword(s):  
Reduction Process ◽  
Slurry Reactor ◽  
Catalyst Loading ◽  
Electrocatalytic Reduction ◽  
Electrocatalytic Hydrogenation ◽  
Perchloric Acid Solution ◽  
Faradaic Efficiency ◽  
Mild Conditions ◽  
Constant Potential ◽  
Low Catalyst Loading

Electrocatalytic hydrogenation-hydrogenolysis (ECH) of guaiacol was performed in an H-cell type of slurry reactor configuration with Pt/C catalyst. Different pairs of electrolytes, in catholyte-anolyte combinations, were investigated by constant potential chronocoulometry, showing that the acidic anolyte is preferable for an effective ECH. The advantages of this slurry reactor are mainly attributed to the enhanced Faradaic efficiency and recoverability of the catalyst. High guaiacol conversion (>90%) can be achieved at mild conditions (307 K, 1 atm) in perchloric acid solution (0.5 M), resulting in 54% cyclohexanol selectivity at moderate Faradaic efficiency (53%) and low catalyst loading. This work opens up the possibility of renewable synthesis of valuable chemicals from biomass-derived substrates via electrocatalytic reduction process at mild conditions.

Highly efficient synthesis of cyclic carbonates from epoxides catalyzed by salen aluminum complexes with built-in “CO2 capture” capability under mild conditions

2014 ◽  
Vol 16 (3) ◽  
pp. 1496-1506 ◽  
Author(s):  
Rongchang Luo ◽  
Xiantai Zhou ◽  
Shaoyun Chen ◽  
Yang Li ◽  
Lei Zhou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Co2 Capture ◽  
High Efficiency ◽  
Single Component ◽  
Cyclic Carbonates ◽  
Efficient Synthesis ◽  
Imidazolium Ionic Liquid ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Salen Aluminum

A polyether-based imidazolium ionic liquid functionalized salen Al complex displays high efficiency and reusability as a homogeneous, single-component and multi-functional catalyst for the cycloaddition of CO2 to epoxides under mild conditions.

scholarly journals Interfacial engineering of cobalt sulfide/graphene hybrids for highly efficient ammonia electrosynthesis

2019 ◽  
Vol 116 (14) ◽  
pp. 6635-6640 ◽  
Author(s):  
Pengzuo Chen ◽  
Nan Zhang ◽  
Sibo Wang ◽  
Tianpei Zhou ◽  
Yun Tong ◽  
...  
Keyword(s):  
Metal Sulfide ◽  
Reduction Reaction ◽  
Cobalt Sulfide ◽  
Ambient Conditions ◽  
Transport Channel ◽  
Hydrogen Electrode ◽  
Faradaic Efficiency ◽  
Strongly Coupled ◽  
Interfacial Engineering ◽  
Highly Efficient

Electrocatalytic N2reduction reaction (NRR) into ammonia (NH3), especially if driven by renewable energy, represents a potentially clean and sustainable strategy for replacing traditional Haber–Bosch process and dealing with climate change effect. However, electrocatalytic NRR process under ambient conditions often suffers from low Faradaic efficiency and high overpotential. Developing newly regulative methods for highly efficient NRR electrocatalysts is of great significance for NH3synthesis. Here, we propose an interfacial engineering strategy for designing a class of strongly coupled hybrid materials as highly active electrocatalysts for catalytic N2fixation. X-ray absorption near-edge spectroscopy (XANES) spectra confirm the successful construction of strong bridging bonds (Co–N/S–C) at the interface between CoSxnanoparticles and NS-G (nitrogen- and sulfur-doped reduced graphene). These bridging bonds can accelerate the reaction kinetics by acting as an electron transport channel, enabling electrocatalytic NRR at a low overpotential. As expected, CoS2/NS-G hybrids show superior NRR activity with a high NH3Faradaic efficiency of 25.9% at −0.05 V versus reversible hydrogen electrode (RHE). Moreover, this strategy is general and can be extended to a series of other strongly coupled metal sulfide hybrids. This work provides an approach to design advanced materials for ammonia production.

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