Effect of Colloidal Particle Size on Catalytic Activity of Anion Exchange Gels†

Langmuir ◽  
2000 ◽  
Vol 16 (23) ◽  
pp. 8814-8819 ◽  
Author(s):  
Warren T. Ford ◽  
Guang Liu
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Anion Exchange ◽  
Colloidal Particle

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).

Facet- and structure-dependent catalytic activity of cuprous oxide/polypyrrole particles towards the efficient reduction of carbon dioxide to methanol

Nanoscale ◽  
2018 ◽  
Vol 10 (25) ◽  
pp. 11869-11880 ◽  
Author(s):  
Arun Prakash Periasamy ◽  
Rini Ravindranath ◽  
Sakkarapalayam Murugesan Senthil Kumar ◽  
Wen-Ping Wu ◽  
Ting-Rui Jian ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Anion Exchange ◽  
Cuprous Oxide ◽  
High Index ◽  
Exchange Mechanism ◽  
Faradaic Efficiency ◽  
Efficient Reduction

Cu2O(OL-MH)/Ppy particles selectively reduce CO2to methanol with a faradaic efficiency of 93 ± 1.2% due to an efficient anion exchange mechanism, dominant low-index (111) facets and high-index (311), (211) facets of Cu2O.

Controlled synthesis and enhanced photoelectro-catalytic activity of a 3D TiO2 nanotube array/TiO2 nanoparticle heterojunction using a combined dielectrophoresis/sol–gel method

2019 ◽  
Vol 7 (17) ◽  
pp. 4981-4987 ◽  
Author(s):  
Ruiyu Bao ◽  
Chen Chen ◽  
Jianxin Xia ◽  
Huiying Chen ◽  
Hua Li
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Surface Morphology ◽  
Sol Gel ◽  
Tio2 Nanoparticle ◽  
Controlled Synthesis ◽  
Tio2 Nanotube Array ◽  
Nanotube Array ◽  
Gel Method ◽  
Sol Gel Method

The surface morphology and particle size of materials can be controlled using DEP technology.

The interplay between ceria particle size, reducibility, and ethanol oxidation activity of ceria-supported gold catalysts

2018 ◽  
Vol 3 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Gregory M. Mullen ◽  
Edward J. Evans ◽  
Benjamin C. Siegert ◽  
Nathan R. Miller ◽  
Benjamin K. Rosselet ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Ethanol Oxidation ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Oxidation Activity ◽  
Supported Gold Catalysts ◽  
Supported Gold ◽  
Ceria Particle

The size of ceria particles influenced the activity of Au/CeO2 catalysts for ethanol oxidation, demonstrating a linear correlation between oxygen storage capacity and catalytic activity.

scholarly journals Carbon Dioxide Reforming of Methane over Ni Supported SiO2: Influence of the Preparation Method on the Resulting Structural Properties and Catalytic Activity

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 795 ◽  
Author(s):  
Hua-Ping Ren ◽  
Shao-Peng Tian ◽  
Si-Yi Ding ◽  
Gui-Qiu Huang ◽  
Min Zhu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Catalytic Activity ◽  
Citric Acid ◽  
Preparation Method ◽  
Complexing Agents ◽  
Impregnation Method ◽  
Carbon Dioxide Reforming ◽  
Highly Active ◽  
Before And After

Ni-C/SiO2 and Ni-G/SiO2 catalysts were prepared by a complexed-impregnation method using citric acid and glycine as complexing agents, respectively. Ni/SiO2 was also prepared by the conventional incipient impregnation method. All the catalysts were comparatively tested for carbon dioxide reforming of methane (CDR) at P = 1.0 atm, T = 750 °C, CO2/CH4 = 1.0, and GHSV = 60,000 mL·g−1·h−1. The results showed that Ni-C/SiO2 and Ni-G/SiO2 exhibited better CDR performance, especially regarding stability, than Ni/SiO2. The conversions of CH4 and CO2 were kept constant above 82% and 87% after 20 h of reaction over Ni-C/SiO2 and Ni-G/SiO2 while they were decreased from 81% and 88% to 56% and 59%, respectively, over the Ni/SiO2. The characterization results of the catalysts before and after the reaction showed that the particle size and the distribution of Ni, as well as the interactions between Ni and the support were significantly influenced by the preparation method. As a result, an excellent resistance to the coking deposition and the anti-sintering of Ni was obtained over the Ni-C/SiO2 and Ni-G/SiO2, leading to a highly active and stable CDR performance.

Catalytic activity of gold-silver nanoalloys for HCHO oxidation: Effect of hydroxyl and particle size

2020 ◽  
Vol 513 ◽  
pp. 145910
Author(s):  
Jing Xu ◽  
Zhenping Qu ◽  
Guozhou Ke ◽  
Yi Wang ◽  
Bin Huang
Keyword(s):  
Particle Size ◽  
Catalytic Activity ◽  
Gold Silver ◽  
Oxidation Effect
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