Nanoporous gold film: fabrication and role as a catalytic reactor

2015 ◽  
Vol 44 (26) ◽  
pp. 11929-11934 ◽  
Author(s):  
Youyi Xia ◽  
Xiang Deng ◽  
Shuxin Yan ◽  
Chang Gao ◽  
Cong Ma ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Gold Film ◽  
Nanoporous Gold ◽  
High Catalytic Activity ◽  
Catalytic Reactor ◽  
Hydrogenation Reactions ◽  
Film Fabrication ◽  
Seed Mediated

A thin NPG film with a thickness of 90 nm can be prepared on various substrates to form a catalytic reactor conveniently by using seed-mediated growth. Because of the nanoporous characterization, the film exhibits high catalytic activity both for oxidative and hydrogenation reactions.

scholarly journals Immobilization of an Iridium(I)-NHC-Phosphine Catalyst for Hydrogenation Reactions under Batch and Flow Conditions

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 656
Author(s):  
Henrietta Kovács ◽  
Krisztina Orosz ◽  
Gábor Papp ◽  
Ferenc Joó ◽  
Henrietta Horváth
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Heterogeneous Catalyst ◽  
Aqueous Phase ◽  
Levulinic Acid ◽  
Flow Reactor ◽  
High Catalytic Activity ◽  
Flow Conditions ◽  
Hydrogenation Reactions ◽  
Excellent Selectivity

Na2[Ir(cod)(emim)(mtppts)] (1) with high catalytic activity in various organic- and aqueous-phase hydrogenation reactions was immobilized on several types of commercially available ion-exchange supports. The resulting heterogeneous catalyst was investigated in batch reactions and in an H-Cube flow reactor in the hydrogenation of phenylacetylene, diphenylacetylene, 1-hexyne, and benzylideneacetone. Under proper conditions, the catalyst was highly selective in the hydrogenation of alkynes to alkenes, and demonstrated excellent selectivity in C=C over C=O hydrogenation; furthermore, it displayed remarkable stability. Activity of 1 in hydrogenation of levulinic acid to γ-valerolactone was also assessed.

Porous single-crystalline palladium nanoflowers with enriched {100} facets for highly enhanced ethanol oxidation

Nanoscale ◽  
2014 ◽  
Vol 6 (24) ◽  
pp. 15090-15097 ◽  
Author(s):  
Kun Qi ◽  
Qiyu Wang ◽  
Weitao Zheng ◽  
Wei Zhang ◽  
Xiaoqiang Cui
Keyword(s):  
Catalytic Activity ◽  
Ethanol Oxidation ◽  
High Catalytic Activity ◽  
Single Crystalline ◽  
Growth Method ◽  
Seed Mediated

Palladium porous single-crystalline nanoflowers (PSNFs) with enriched high catalytic activity {100} facets were synthesized using a mild and controllable seed mediated growth method.

A facile synthesis of Pt@Ir zigzag bimetallic nanocomplexes for hydrogenation reactions

2015 ◽  
Vol 51 (44) ◽  
pp. 9216-9219 ◽  
Author(s):  
Jiaqing Wang ◽  
Danhua Ge ◽  
Xueqin Cao ◽  
Minghua Tang ◽  
Yue Pan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Facile Synthesis ◽  
Hydrogenation Reactions

A facile approach for the synthesis of Pt@Ir zigzag bimetallic nanocomplexes with high catalytic activity.

scholarly journals Palladium nanoparticles supported on nitrogen doped porous carbon material derived from cyclodextrin, glucose and melamine based polymer: promising catalysts for hydrogenation reactions

2020 ◽  
Vol 92 (6) ◽  
pp. 827-837 ◽  
Author(s):  
Samahe Sadjadi ◽  
Masoumeh Malmir ◽  
Bastien Léger ◽  
Eric Monflier ◽  
Majid M. Heravi
Keyword(s):  
Catalytic Activity ◽  
Palladium Nanoparticles ◽  
Aqueous Media ◽  
Hydrogenation Reaction ◽  
Molar Ratio ◽  
Porous Carbon Material ◽  
High Catalytic Activity ◽  
Hydrothermal Conditions ◽  
Nitrogen Doped ◽  
Hydrogenation Reactions

AbstractMelamine based polymer (MT) was prepared and then reacted with a mixture of glucose (Glu) and β-cyclodextrin (CD) under hydrothermal conditions to afford, MT/Glu-CD. Then, the adsorption of Pd salt was realized on MT/Glu-CD. The resulting compound was subsequently carbonized to furnish Pd/MT/C that exhibited high catalytic activity for the hydrogenation of nitroarenes in aqueous media. To elucidate the roles of CD, Glu, the molar ratio of Glu:CD and the carbonization in the catalytic activity, several control catalysts have been prepared and their performances for a model hydrogenation reaction were compared with that of Pd/MT/C. The results confirmed the importance of the carbonization as well as the presence of CD for achieving high catalytic activity. Moreover, it was found that the molar ratio of Glu:CD could affect the catalytic activity of the final catalyst and the optimum molar ratio of Glu:CD was 30:70. The recycling test as well as measurement of Pd leaching demonstrated high recyclability and low Pd leaching of Pd/MT/C.

Seed-mediated synthesis of dendritic platinum nanostructures with high catalytic activity for aqueous-phase hydrogenation of acetophenone

2015 ◽  
Vol 24 (5) ◽  
pp. 660-668 ◽  
Author(s):  
Yuan Yuan ◽  
Yusuf Valentino Kaneti ◽  
Minsu Liu ◽  
Fangzhu Jin ◽  
Danielle Frances Kennedy ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Aqueous Phase ◽  
High Catalytic Activity ◽  
Seed Mediated

Atomic origins of the high catalytic activity of nanoporous gold

2012 ◽  
Vol 11 (9) ◽  
pp. 775-780 ◽  
Author(s):  
Takeshi Fujita ◽  
Pengfei Guan ◽  
Keith McKenna ◽  
Xingyou Lang ◽  
Akihiko Hirata ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nanoporous Gold ◽  
High Catalytic Activity

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

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