scholarly journals Copper on carbon materials: stabilization by nitrogen doping

2017 ◽  
Vol 5 (21) ◽  
pp. 10574-10583 ◽  
Author(s):  
Dmitri A. Bulushev ◽  
Andrey L. Chuvilin ◽  
Vladimir I. Sobolev ◽  
Svetlana G. Stolyarova ◽  
Yury V. Shubin ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Nitrogen Doping ◽  
Carbon Materials ◽  
Carbon Support ◽  
High Catalytic Activity ◽  
N Doping

N-doping of carbon support prevents sintering of Cu and provides its high catalytic activity in H2 formation from formic acid.

High Efficiency Nitrogen Doping and Single Atom Cobalt Anchoring via Supermolecules for Oxygen Reduction Electrocatalysis

2021 ◽  
Author(s):  
Libo Deng ◽  
Xiujuan Li ◽  
Yuanyuan Chen ◽  
Weijie Liao ◽  
Lei Qiu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Nitrogen Doping ◽  
High Efficiency ◽  
Carbon Support ◽  
Utilization Efficiency ◽  
Single Atom ◽  
High Catalytic Activity

Single atom catalysts (SACs) stabilized by nitrogen in a carbon support and having maximized atom utilization efficiency and an unsaturated environment exhibit high catalytic activity and selectivity. Incorporating nitrogen into...

A Ag–Pd alloy supported on an amine-functionalized UiO-66 as an efficient synergetic catalyst for the dehydrogenation of formic acid at room temperature

2016 ◽  
Vol 6 (3) ◽  
pp. 869-874 ◽  
Author(s):  
Shu-Tao Gao ◽  
Weihua Liu ◽  
Cheng Feng ◽  
Ning-Zhao Shang ◽  
Chun Wang
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Room Temperature ◽  
High Catalytic Activity ◽  
Amine Functionalized ◽  
Pd Alloy

Ag–Pd alloys deposited on an amine-functionalized UiO-66(NH2–UiO-66) have been successfully prepared via a pre-coordination method and used as a AgPd@NH2–UiO-66 catalyst with 100% H2 selectivity and a high catalytic activity.

Enhancement of Pt-Based Catalysts via N-Doped Carbon Supports

2008 ◽  
Author(s):  
Ryan O’Hayre ◽  
Yingke Zhou ◽  
Robert Pasquarelli ◽  
Joe Berry ◽  
David Ginley
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Methanol Oxidation ◽  
Nitrogen Doping ◽  
Ion Beam ◽  
Catalyst Activity ◽  
Pt Catalyst ◽  
Activity Measurement ◽  
Pt Nanoparticle ◽  
N Doping

This study experimentally examines the enhancement of carbon supported Pt-based catalysts systems via nitrogen doping. It has been reported that nitrogen-containing carbons promote significant enhancement in Pt/C catalyst activity and durability with respect to the methanol oxidation and oxygen reduction reactions. In order to systematically investigate the effect of N-doping, in this work we have developed geometrically well-defined model catalytic systems consisting of tunable assemblies of Pt catalyst nanoparticles deposited onto both N-doped and undoped highly-oriented pyrolytic graphite (HOPG) substrates. N-doping was achieved via ion beam implantation, and Pt was electrodeposited from solutions of H2PtCl6 in aqueous HClO4. Morphology from scanning electron microscopy (SEM) and catalytic activity measurement from aqueous electrochemical analysis were utilized to examine the N-doping effects. The results strongly support the theory that doping nitrogen into a graphite support significantly affects both the morphology and behavior of the overlying Pt nanoparticles. In particular, nitrogen-doping was observed to cause a significant decrease in the average Pt nanoparticle size, an increase in the Pt nanoparticle dispersion, and a significant increase in catalytic activity for both methanol oxidation and oxygen reduction.

High catalytic activity of a bimetallic AgPd alloy supported on UiO-66 derived porous carbon for transfer hydrogenation of nitroarenes using formic acid-formate as the hydrogen source

2017 ◽  
Vol 41 (18) ◽  
pp. 9857-9865 ◽  
Author(s):  
Saisai Cheng ◽  
Ningzhao Shang ◽  
Xin Zhou ◽  
Cheng Feng ◽  
Shutao Gao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Porous Carbon ◽  
Room Temperature ◽  
Transfer Hydrogenation ◽  
High Catalytic Activity

The Ag1Pd9@NPC-UiO-66 catalyst was fabricated and exhibited extraordinary catalytic activity toward the hydrogenation of nitroarenes to anilines at room temperature.

Reactivity of boron- and nitrogen-doped carbon nanotubes functionalized by (Pt, Eu) atoms toward O2 and CO: A density functional study

2016 ◽  
Vol 27 (07) ◽  
pp. 1650075 ◽  
Author(s):  
S. Abdel Aal
Keyword(s):  
Catalytic Activity ◽  
Charge Transfer ◽  
Density Functional ◽  
Co Adsorption ◽  
Energy Charge ◽  
Reduction Reaction ◽  
Functional Study ◽  
High Catalytic Activity ◽  
N Doping ◽  
Different Response

The adsorption behavior and electronic properties of CO and O2 molecules at the supported Pt and Eu atoms on (5,5) armchair SWCNT have been systematically investigated within density functional theory (DFT). Fundamental aspects such as adsorption energy, natural bond orbital (NBO), charge transfer, frontier orbitals and the projected density of states (PDOS) are elucidated to analyze the adsorption properties of CO and O2 molecules. The results reveal that B- and N-doping CNTs can enhance the binding strength and catalytic activity of Pt (Eu) anchored on the doped-CNT, where boron-doping is more effective. The electronic structures of supported metal are strongly influenced by the presence of gases. After adsorption of CO and O2, the changes in binding energy, charge transfer and conductance may lead to the different response in the metal-doped CNT-based sensors. It is expected that these results could provide helpful information for the design and fabrication of the CO and O2 sensing devices. The high catalytic activity of Pt supported at doped-CNT toward the interaction with CO and O2 may be attributed to the electronic resonance particularly among Pt-5d, CO-2[Formula: see text]* and O2-2[Formula: see text]* antibonding orbitals. In contrast to the supported Eu at doped-CNT, the Eu atom becomes more positively charged, which leads to weaken the CO adsorption and promote the O2 adsorption, consequently enhancing the activity for CO oxidation and alleviating the CO poisoning of the europium catalysts. A notable orbital hybridization and electrostatic interaction between these two species in adsorption process being an evidence of strong interaction. The electronic structure of O2 adsorbed on Eu-doped CNT resembles that of O[Formula: see text], therefore the transferred charge weakens the O–O bonds and facilitates the dissociation process, which is the precondition for the oxygen reduction reaction (ORR).

AgPd@Pd/TiO2 nanocatalyst synthesis by microwave heating in aqueous solution for efficient hydrogen production from formic acid

2015 ◽  
Vol 3 (20) ◽  
pp. 10666-10670 ◽  
Author(s):  
Masashi Hattori ◽  
Daisuke Shimamoto ◽  
Hiroki Ago ◽  
Masaharu Tsuji
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Hydrogen Production ◽  
Formic Acid ◽  
Microwave Heating ◽  
High Catalytic Activity

AgPd@Pd nanocatalysts loaded on TiO2 were fabricated in aqueous solution using MW heating to suppress alloying for high catalytic activity.

scholarly journals An Efficient Hydration and Tandem Transfer Hydrogenation of Alkynes for the Synthesis of Alcohol in Water

Synthesis ◽  
2020 ◽  
Vol 52 (22) ◽  
pp. 3439-3445
Author(s):  
Lu Ouyang ◽  
Renshi Luo ◽  
Nianhua Luo ◽  
Yuhong Zhong ◽  
Ji-Tian Liu
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Efficient Method ◽  
Transfer Hydrogenation ◽  
High Catalytic Activity ◽  
Turnover Frequency ◽  
One Pot ◽  
Mild Conditions ◽  
Tandem Process ◽  
Metal Ligand

A practical and efficient method for the synthesis of alcohols in one pot from readily available alkynes via a tandem process by formic acid promoted hydration and metal-ligand bifunctional iridium-catalyzed­ transfer hydrogenation under mild conditions has been described. This transformation is simple, efficient, and can be performed with a variety of alkynes in good yields and with excellent stereoselectivities. Experimental results showed high catalytic activity, and turnover frequency (TOF) up to 25000. Importantly, this transformation can be conducted in water, and is thus green and environmentally friendly.

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