Electrochemical promotion of carbon supported Pt, Rh and Pd catalysts for H2 oxidation in aqueous alkaline media

2018 ◽  
Vol 93 (6) ◽  
pp. 1542-1548 ◽  
Author(s):  
Michail Athanasiou ◽  
Bjorn Hasa ◽  
John Vakros ◽  
Labrini Sygellou ◽  
Alexandros Katsaounis
Keyword(s):  
Electrochemical Promotion ◽  
Alkaline Media ◽  
Pd Catalysts ◽  
H2 Oxidation

Glycerol electro-oxidation in alkaline media using Pt and Pd catalysts electrodeposited on three-dimensional porous carbon electrodes

2017 ◽  
Vol 41 (4) ◽  
pp. 1854-1863 ◽  
Author(s):  
N. Arjona ◽  
S. Rivas ◽  
L. Álvarez-Contreras ◽  
M. Guerra-Balcázar ◽  
J. Ledesma-García ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Three Dimensional ◽  
Alkaline Media ◽  
Carbon Electrodes ◽  
Carbon Paper ◽  
Pd Catalysts ◽  
Entire Structure ◽  
Electro Oxidation ◽  
Porous Carbon Electrodes ◽  
Pt Electrocatalysts

Electrodeposition of Pd and Pt electrocatalysts on the entire structure of carbon paper and carbon nanofoam enhances the glycerol electro-oxidation.

Quasi-zero-dimensional cobalt-doped CeO2 dots on Pd catalysts for alcohol electro-oxidation with enhanced poisoning-tolerance

Nanoscale ◽  
2017 ◽  
Vol 9 (34) ◽  
pp. 12565-12572 ◽  
Author(s):  
Qiang Tan ◽  
Haiyan Zhu ◽  
Shengwu Guo ◽  
Yuanzhen Chen ◽  
Tao Jiang ◽  
...  
Keyword(s):  
Alkaline Media ◽  
Ethanol Electrooxidation ◽  
Pd Catalysts ◽  
Electro Oxidation ◽  
Doped Ceo2

The ultrafine cobalt-doped CeO2 dots were prepared with a new facile approach, and they can be an effective anti-poisoning promoter for Pd catalysts towards methanol and ethanol electrooxidation reaction in alkaline media.

Comparative study to understand the intrinsic properties of Pt and Pd catalysts for methanol and ethanol oxidation in alkaline media

2015 ◽  
Vol 185 ◽  
pp. 267-275 ◽  
Author(s):  
Jianshe Wang ◽  
Niancai Cheng ◽  
Mohammad Norouzi Banis ◽  
Biwei Xiao ◽  
Adam Riese ◽  
...  
Keyword(s):  
Comparative Study ◽  
Ethanol Oxidation ◽  
Alkaline Media ◽  
Intrinsic Properties ◽  
Pd Catalysts

Application of pure, thermostable, alkali-tolerant xylanase in bleaching of oxygen-delignified pine kraft pulp

TAPPI Journal ◽  
2015 ◽  
Vol 14 (11) ◽  
pp. 689-694
Author(s):  
QINGZHI MA ◽  
QI WANG ◽  
CHU WANG ◽  
NIANJIE FENG ◽  
HUAMIN ZHAI
Keyword(s):  
Intrinsic Viscosity ◽  
Chlorine Dioxide ◽  
High Purity ◽  
Kraft Pulp ◽  
Alkaline Media ◽  
Industrial Scale ◽  
Elemental Chlorine ◽  
Effect Of Oxygen ◽  
Alkaline Tolerant ◽  
Ecf Bleaching

The effect of oxygen (O2)-delignified pine kraft pulp pretreatment by high-purity, thermostable, and alkaline-tolerant xylanases on elemental chlorine free (ECF) bleaching of O2-delignification kraft pulp was studied. The study found that xylanase pretreatment preserved the intrinsic viscosity and yield of O2-delignified pulp while causing about 7% of delignification with high delignification selectivity. The xylanases with high purity, higher thermostability (75°C~80°C) in highly alkaline media (pH 8.0~9.5) could be applied on an industrial scale. Pulp pretreatment by the high-purity, thermostable, and alkaline tolerant xylanases could improve pulp brightness or reduce the chlorine dioxide (ClO2) consumption. In a D0ED1D2 bleaching sequence using the same amount of ClO2, the xylanase-pretreated pulp obtained a higher brightness (88.2% vs. 89.7% ISO) at the enzyme dose of 2 U/g pulp; or for the same brightness as control (88.2% ISO), the ClO2 dosage in the D0 stage was reduced by 27%, which represents a 16% savings in total ClO2 used for bleaching.

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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