copper catalysts
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Fuel ◽  
2022 ◽  
Vol 314 ◽  
pp. 123061
Author(s):  
Shiwei Ge ◽  
Xiaoqing Liu ◽  
Jun Liu ◽  
Hao Liu ◽  
Haiyan Liu ◽  
...  

Processes ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 145
Author(s):  
Yiwei Luo ◽  
Yonglong Li ◽  
Conghui Wang ◽  
Jing Wang ◽  
Wenming Liu ◽  
...  

Copper catalysts have been extensively studied for CO oxidation at low temperatures. Previous findings on the stability of such catalysts, on the other hand, revealed that they deactivated badly under extreme circumstances. Therefore, in this work, a series of KCC−1-supported copper oxide catalysts were successfully prepared by impregnation method, of which 5% CuO/KCC−1 exhibited the best activity: CO could be completely converted at 120 °C. The 5% CuO/KCC−1 catalyst exhibited better thermal stability, which is mainly attributed to the large specific surface area of KCC−1 that facilitates the high dispersion of CuO species, and because the dendritic layered walls can lengthen the movement distances from particle-to-particle, thus helping to slow down the tendency of active components to sinter. In addition, the 5% CuO/KCC−1 has abundant mesoporous and surface active oxygen species, which are beneficial to the mass transfer and promote the adsorption of CO and the decomposition of Cu+–CO species, thus improving the CO oxidation performance of the catalyst.


2022 ◽  
Author(s):  
Charles Creissen ◽  
José Guillermo Rivera de la Cruz ◽  
Dilan Karapinar ◽  
Dario Taverna ◽  
Moritz Schreiber ◽  
...  

Electrochemical CO2 reduction presents a sustainable route to the production of chemicals and fuels. Achieving a narrow product distribution with copper catalysts is challenging and conventional material modifications offer limited control over selectivity. Here, we show that the mild cathodic potentials required to reach high currents in an alkaline gas-fed flow cell permits retention of a surface-bound thiol (4-mercaptopyridine), enabling molecule-directed selective formate generation at high reaction rates. Combined experimental and computational results showed that formate production is favoured due to the inhibition of a CO producing pathway caused by destabilising interactions with the anchored molecule. The immobilisation of molecules to inhibit specific carbon-based products therefore offers a novel approach to rationally tune the selectivity of heterogeneous catalysts.


Author(s):  
Lucas Garcia Verga ◽  
Paulo C. D. Mendes ◽  
Vivianne K. Ocampo-Restrepo ◽  
Juarez L. F. Da Silva

The electrochemical reduction of CO2 is a promising technology to reach a carbon-neutral economy. However, among other challenges, the design of active and selective catalysts still bottlenecks such advances. Herein,...


Catalysts ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 45
Author(s):  
Ivy L. Librando ◽  
Abdallah G. Mahmoud ◽  
Sónia A. C. Carabineiro ◽  
M. Fátima C. Guedes da Silva ◽  
Francisco J. Maldonado-Hódar ◽  
...  

A supported gold nanoparticle-catalyzed strategy has been utilized to promote a click chemistry reaction for the synthesis of 1,2,3-triazoles via the azide-alkyne cycloaddition (AAC) reaction. While the advent of effective non-copper catalysts (i.e., Ru, Ag, Ir) has demonstrated the catalysis of the AAC reaction, additional robust catalytic systems complementary to the copper catalyzed AAC remain in high demand. Herein, Au nanoparticles supported on Al2O3, Fe2O3, TiO2 and ZnO, along with gold reference catalysts (gold on carbon and gold on titania supplied by the World Gold Council) were used as catalysts for the AAC reaction. The supported Au nanoparticles with metal loadings of 0.7–1.6% (w/w relative to support) were able to selectively obtain 1,4-disubstituted-1,2,3-triazoles in moderate yields up to 79% after 15 min, under microwave irradiation at 150 °C using a 0.5–1.0 mol% catalyst loading through a one-pot three-component (terminal alkyne, organohalide and sodium azide) procedure according to the “click” rules. Among the supported Au catalysts, Au/TiO2 gave the best results.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Philipp Grosse ◽  
Aram Yoon ◽  
Clara Rettenmaier ◽  
Antonia Herzog ◽  
See Wee Chee ◽  
...  

Author(s):  
Weibo Hu ◽  
Jiejie Li ◽  
Lushan Ma ◽  
Wanyu Su ◽  
Yanping Zhu ◽  
...  

2021 ◽  
Author(s):  
Junnan Li ◽  
Nikolay Kornienko

<p>Electrosynthetic techniques are gaining prominence across the fields of chemistry, engineering and energy science. However, most works within the direction of synthetic heterogeneous electrocatalysis focus on water electrolysis and CO<sub>2</sub> reduction. In this work, we moved to expand the scope of this technology by developing a synthetic scheme which couples CO<sub>2</sub> and NH<sub>3</sub> at a gas-liquid-solid triple-phase boundary to produce species with C-N bonds. Specifically, by bringing in CO<sub>2</sub> from the gas phase and NH<sub>3</sub> from the liquid phase together over solid copper catalysts, we have succeeded in forming formamide and acetamide products for the first time. In a subsequent complementary step, we have combined electrochemical analysis and a newly developed <i>operando </i>spectroelectrochemical method, capable of probing the aforementioned triple phase boundary, to extract an initial level of mechanistic analysis regarding the reaction pathways of these reactions and the current system’s limitations. We believe that the development and understanding of this set of reaction pathways will play an exceptionally significant role in expanding the community’s understanding of on-surface electrosynthetic reactions as well as push this set of inherently sustainable technologies towards widespread applicability. </p>


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