scholarly journals Anchoring Cu1 species over nanodiamond-graphene for semi-hydrogenation of acetylene

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Fei Huang ◽  
Yuchen Deng ◽  
Yunlei Chen ◽  
Xiangbin Cai ◽  
Mi Peng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Selective Hydrogenation ◽  
High Selectivity ◽  
Catalytic Performance ◽  
Transition Metal Catalysts ◽  
Effective Activation ◽  
Earth Abundant ◽  
Unique Structural Feature ◽  
Cu Catalyst ◽  
Excellent Catalytic Performance

Abstract The design of cheap, non-toxic, and earth-abundant transition metal catalysts for selective hydrogenation of alkynes remains a challenge in both industry and academia. Here, we report a new atomically dispersed copper (Cu) catalyst supported on a defective nanodiamond-graphene (ND@G), which exhibits excellent catalytic performance for the selective conversion of acetylene to ethylene, i.e., with high conversion (95%), high selectivity (98%), and good stability (for more than 60 h). The unique structural feature of the Cu atoms anchored over graphene through Cu-C bonds ensures the effective activation of acetylene and easy desorption of ethylene, which is the key for the outstanding activity and selectivity of the catalyst.

Multimetal-MOF-derived transition metal alloy NPs embedded in an N-doped carbon matrix: highly active catalysts for hydrogenation reactions

2016 ◽  
Vol 4 (26) ◽  
pp. 10254-10262 ◽  
Author(s):  
Jilan Long ◽  
Kui Shen ◽  
Liang Chen ◽  
Yingwei Li
Keyword(s):  
Transition Metal ◽  
Carbon Matrix ◽  
Catalytic Performance ◽  
Metal Alloy ◽  
Transfer Hydrogenation ◽  
Transition Metal Alloy ◽  
Highly Active ◽  
Hydrogenation Reactions ◽  
Excellent Catalytic Performance ◽  
Hydrogenation Of Nitriles

We report a MOF-templated route to synthesize transition metal alloy NPs embedded in an N-doped carbon matrix. The alloy-based catalysts exhibited excellent catalytic performance and widespread substrate applicability for the transfer hydrogenation of nitriles.

Copper nanoparticles socketed in situ into copper phyllosilicate nanotubes with enhanced performance for chemoselective hydrogenation of esters

2017 ◽  
Vol 53 (51) ◽  
pp. 6933-6936 ◽  
Author(s):  
Xiaoxiao Gong ◽  
Meiling Wang ◽  
Huihuang Fang ◽  
Xiaoqi Qian ◽  
Linmin Ye ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Selective Hydrogenation ◽  
Elevated Temperatures ◽  
Catalytic Performance ◽  
Reducing Atmosphere ◽  
Chemoselective Hydrogenation ◽  
Excellent Catalytic Performance

Copper nanoparticles exsoluted in situ under a reducing atmosphere at elevated temperatures are socketed into the parent copper phyllosilicate nanotubes and exhibit excellent catalytic performance and superior stability for the selective hydrogenation of various esters to alcohols.

scholarly journals Highly Active Pandanus Nanocellulose-Supported Poly(amidoxime) Copper (II) Complex for Ullmann Cross-Coupling Reaction

2020 ◽  
Vol 2 (1) ◽  
pp. 14
Author(s):  
Choong Jian Fui ◽  
Tang Xin Ting ◽  
Mohd Sani Sarjadi ◽  
Md Lutfor Rahman
Keyword(s):  
Transition Metal ◽  
Coupling Reaction ◽  
Transition Metal Catalysts ◽  
High Catalytic Activity ◽  
Radical Initiation ◽  
Organometallic Reagents ◽  
Highly Active ◽  
Earth Abundant ◽  
Free Radical Initiation ◽  
Benzyl Halides

The transition metal-catalyzed chemical transformation of organic electrophiles, and organometallic reagents have turned up as an exceedingly robust synthetic tool. The evolution of transition metal catalysts has attained a stage of civilization that authorizes for an extensive scope of chemical bonds formation partners to be combined efficiently. The applications of Cu-based nanoparticles have received great attention owing to the earth-abundant, low toxicity and inexpensive. Due to these characteristics, copper nanoparticles have generated a great deal of interest especially in the field of catalysis. In this study, poly(acrylonitrile) was synthesized by undergoes free-radical initiation process and followed by Beckmann rearrangement with hydroxylamine solution converted into the poly(amidoxime) ligand and anchored the copper onto poly(amidoxime). Cu(II)@PAM was characterized using different techniques such as FTIR, FESEM, EDX, TEM, TGA, DSC, ICP-OES, and XPS analyses. The Cu(II)@PAM showed high stability and high catalytic activity in a wide variety of electrophilic substituted phenols with substituted aryl/benzyl halides. 0.15 mol%, ±3 mg of Cu(II)@PAM could efficiently promote Ullmann reaction to give the corresponding coupling product up to 99 % yields. The complex was easy separated and recovered from the reaction mixture by simple filtration.

Electrocatalytic reduction of CO2 by two-dimensional transition metal porphyrin sheets

2019 ◽  
Vol 7 (19) ◽  
pp. 11944-11952 ◽  
Author(s):  
Jin-Hang Liu ◽  
Li-Ming Yang ◽  
Eric Ganz
Keyword(s):  
Transition Metal ◽  
Catalytic Performance ◽  
Two Dimensional ◽  
Electrocatalytic Reduction ◽  
Metal Porphyrin ◽  
Reduction Of Co2 ◽  
Excellent Catalytic Performance ◽  
Cu And Zn ◽  
Electrocatalytic Reduction Of Co2 ◽  
Monolayer Catalysts

The first transition metal series TM–PP monolayer catalysts exhibit excellent catalytic performance during the process of electroreduction of CO2. The products have 2e− CO (Sc, Mn and Ni), HCOOH (Cr, Fe, Co, Cu and Zn), 8e− CH4 (Ti and V), and the overpotential of the reaction can be as low as 0.127 V.

Transition metal M (M = Co, Ni, and Fe) and boron co-modulation in Rh-based aerogels for highly efficient and pH-universal hydrogen evolution electrocatalysis

2020 ◽  
Vol 8 (11) ◽  
pp. 5595-5600 ◽  
Author(s):  
Kai Deng ◽  
Tianlun Ren ◽  
You Xu ◽  
Songliang Liu ◽  
Zechuan Dai ◽  
...  
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Catalytic Performance ◽  
Reduction Strategy ◽  
Highly Efficient ◽  
Co Reduction ◽  
Excellent Catalytic Performance

RhCoB aerogels were successfully synthesized via a facile chemical co-reduction strategy and exhibited excellent catalytic performance toward the hydrogen evolution reaction.

Effect of Steam Treatment on Catalytic Performance of La2O3-HZSM-5 for Methylation of Toluene with Methanol

2012 ◽  
Vol 629 ◽  
pp. 381-385 ◽  
Author(s):  
Jun Hui Li ◽  
Zhong Hua Hu ◽  
Ya Nan Wang ◽  
Hao Xiang ◽  
Zhi Rong Zhu
Keyword(s):  
High Selectivity ◽  
Fixed Bed ◽  
Shape Selectivity ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Fixed Bed Reactor ◽  
Steam Treatment ◽  
By Products ◽  
Poor Stability ◽  
Excellent Catalytic Performance

Methylation of toluene with methanol to synthesize p-Xylene was performed in a fixed-bed reactor. HZSM-5 zeolite as a catalyst was prepared by modification with La2O3. In addition, effect of steam treatment for La2O3-modified HZSM-5 on its catalytic performance was investigated as well. The properties of as-prepared catalysts were characterized by XRD, BET and NH3-TPD. The results indicate that modification with La2O3can narrow the size of HZSM-5 channel effectively. And more than 90% selectivity of p-Xylene is obtained over HZSM-5 with loading of 24% and 30% La2O3. However, above La2O3-modified HZSM-5 with high-selectivity exhibit a poor stability for time on-stream of the methylation reaction. Steam treatment of La2O3-modified HZSM-5 can improve its stability and shape selectivity, decreasing by-products. These effects can be attributed to distortion & narrowing of HZSM-5 channel and reduction of HZSM-5 strong Bronsted acid sites during steam treatment. As a result, the excellent catalytic performance is obtained over 24.0% La2O3-modified HZSM-5 by steam treatment at 773 K for 1.0 h, being 23% conversion of toluene, 93% selectivity of p-Xylene during time on-stream.

scholarly journals Water oxidation using earth-abundant transition metal catalysts: opportunities and challenges

2016 ◽  
Vol 45 (37) ◽  
pp. 14421-14461 ◽  
Author(s):  
Markus D. Kärkäs ◽  
Björn Åkermark
Keyword(s):  
Transition Metal ◽  
Solar Energy ◽  
Water Oxidation ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Oxidation Catalysts ◽  
Fuel Conversion ◽  
Earth Abundant ◽  
Vital Component ◽  
Conversion Technologies

Catalysts for the oxidation of water are a vital component of solar energy to fuel conversion technologies. This Perspective summarizes recent advances in the field of designing homogeneous water oxidation catalysts (WOCs) based on Mn, Fe, Co and Cu.

Transition metal nanoparticles dispersed in an alumina matrix as active and stable catalysts for COx-free hydrogen production from ammonia

2015 ◽  
Vol 3 (33) ◽  
pp. 17172-17180 ◽  
Author(s):  
Ying-Qiu Gu ◽  
Zhao Jin ◽  
Hu Zhang ◽  
Rong-Jie Xu ◽  
Ming-Jiang Zheng ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Ni Nanoparticles ◽  
Alumina Matrix ◽  
Transition Metal Nanoparticles ◽  
Free Hydrogen ◽  
Co Precipitation ◽  
Excellent Catalytic Performance

Transition metal (Fe, Co, and Ni) nanoparticles dispersed in an alumina matrix were synthesized by a facile co-precipitation method and showed excellent catalytic performance for NH3 decomposition.

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