scholarly journals Electrocatalytic hydrogenation of acetophenone using a Polymer Electrolyte Membrane Electrochemical Reactor

2013 ◽  
Vol 91 ◽  
pp. 69-74 ◽  
Author(s):  
Alfonso Sáez ◽  
Vicente García-García ◽  
José Solla-Gullón ◽  
Antonio Aldaz ◽  
Vicente Montiel
Keyword(s):  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Electrochemical Reactor ◽  
Electrocatalytic Hydrogenation ◽  
Electrolyte Membrane

scholarly journals An alternative to hydrogenation processes. Electrocatalytic hydrogenation of benzophenone

2018 ◽  
Vol 14 ◽  
pp. 537-546
Author(s):  
Cristina Mozo Mulero ◽  
Alfonso Sáez ◽  
Jesús Iniesta ◽  
Vicente Montiel
Keyword(s):  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Pd Nanoparticles ◽  
Electrochemical Reactor ◽  
Gas Diffusion ◽  
Hydrogen Gas ◽  
Electrocatalytic Hydrogenation ◽  
Fractional Conversion ◽  
Electrolyte Membrane ◽  
Exchange Membrane

The electrocatalytic hydrogenation of benzophenone was performed at room temperature and atmospheric pressure using a polymer electrolyte membrane electrochemical reactor (PEMER). Palladium (Pd) nanoparticles were synthesised and supported on a carbonaceous matrix (Pd/C) with a 28 wt % of Pd with respect to carbon material. Pd/C was characterised by transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). Cathodes were prepared using Pd electrocatalytic loadings (LPd) of 0.2 and 0.02 mg cm−2. The anode consisted of hydrogen gas diffusion for the electrooxidation of hydrogen gas, and a 117 Nafion exchange membrane acted as a cationic polymer electrolyte membrane. Benzophenone solution was electrochemically hydrogenated in EtOH/water (90/10 v/v) plus 0.1 M H2SO4. Current densities of 10, 15 and 20 mA cm−2were analysed for the preparative electrochemical hydrogenation of benzophenone and such results led to the highest fractional conversion (XR) of around 30% and a selectivity over 90% for the synthesis of diphenylmethanol upon the lowest current density. With regards to an increase by ten times the Pd electrocatalytic loading the electrocatalytic hydrogenation led neither to an increase in fractional conversion nor to a change in selectivity.

scholarly journals Electrochemical Hydrogenation of Acetone to Produce Isopropanol Using a Polymer Electrolyte Membrane Reactor

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2691 ◽  
Author(s):  
Chen Li ◽  
Ashanti Sallee ◽  
Xiaoyu Zhang ◽  
Sandeep Kumar
Keyword(s):  
Polymer Electrolyte ◽  
Atmospheric Pressure ◽  
Membrane Reactor ◽  
Polymer Electrolyte Membrane ◽  
Electrochemical Reactor ◽  
Electrochemical Hydrogenation ◽  
Chemical Waste ◽  
High Current Efficiency ◽  
Electrolyte Membrane ◽  
Mitigation Methods

Electrochemical hydrogenation (ECH) of acetone is a relatively new method to produce isopropanol. It provides an alternative way of upgrading bio-fuels with less energy consumption and chemical waste as compared to conventional methods. In this paper, Polymer Electrolyte Membrane Fuel Cell (PEMFC) hardware was used as an electrochemical reactor to hydrogenate acetone to produce isopropanol and diisopropyl ether as a byproduct. High current efficiency (59.7%) and selectivity (>90%) were achieved, while ECH was carried out in mild conditions (65 °C and atmospheric pressure). Various operating parameters were evaluated to determine their effects on the yield of acetone and the overall efficiency of ECH. The results show that an increase in humidity increased the yield of propanol and the efficiency of ECH. The operating temperature and power supply, however, have less effect. The degradation of membranes due to contamination of PEMFC and the mitigation methods were also investigated.

Effect of gas composition on Ru dissolution and crossover in polymer-electrolyte membrane fuel cells

2010 ◽  
Vol 195 (15) ◽  
pp. 4622-4627 ◽  
Author(s):  
Tommy T.H. Cheng ◽  
Nengyou Jia ◽  
Vesna Colbow ◽  
Silvia Wessel ◽  
Monica Dutta
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Gas Composition ◽  
Electrolyte Membrane

scholarly journals Review of the Durability of Polymer Electrolyte Membrane Fuel Cell in Long-Term Operation: Main Influencing Parameters and Testing Protocols

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4048
Author(s):  
Huu Linh Nguyen ◽  
Jeasu Han ◽  
Xuan Linh Nguyen ◽  
Sangseok Yu ◽  
Young-Mo Goo ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Failure Modes ◽  
Polymer Electrolyte Membrane ◽  
Durability Test ◽  
Term Operation ◽  
Electrolyte Membrane ◽  
Transportation Applications ◽  
Testing Protocols

Durability is the most pressing issue preventing the efficient commercialization of polymer electrolyte membrane fuel cell (PEMFC) stationary and transportation applications. A big barrier to overcoming the durability limitations is gaining a better understanding of failure modes for user profiles. In addition, durability test protocols for determining the lifetime of PEMFCs are important factors in the development of the technology. These methods are designed to gather enough data about the cell/stack to understand its efficiency and durability without causing it to fail. They also provide some indication of the cell/stack’s age in terms of changes in performance over time. Based on a study of the literature, the fundamental factors influencing PEMFC long-term durability and the durability test protocols for both PEMFC stationary and transportation applications were discussed and outlined in depth in this review. This brief analysis should provide engineers and researchers with a fast overview as well as a useful toolbox for investigating PEMFC durability issues.

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