Rhodium- and palladium-catalysed proton exchange in styrene detected in situ by para-hydrogen induced polarization

1996 ◽  
pp. 2483 ◽  
Author(s):  
Andreas Harthun ◽  
Ralf Giernoth ◽  
Cornelis J. Elsevier ◽  
Joachim Bargon
Keyword(s):  
Induced Polarization ◽  
Proton Exchange ◽  
Para Hydrogen

scholarly journals Efficient Synthesis of Molecular Precursors for Para-Hydrogen-Induced Polarization of Ethyl Acetate-1-13 C and Beyond

2016 ◽  
Vol 55 (20) ◽  
pp. 6071-6074 ◽  
Author(s):  
Roman V. Shchepin ◽  
Danila A. Barskiy ◽  
Aaron M. Coffey ◽  
Isaac V. Manzanera Esteve ◽  
Eduard Y. Chekmenev
Keyword(s):  
Ethyl Acetate ◽  
Induced Polarization ◽  
Para Hydrogen ◽  
Efficient Synthesis ◽  
Molecular Precursors

scholarly journals In Situ XAFS Methods for Characterizing Catalyst Structure in Proton Exchange Membrane Fuel Cell

2015 ◽  
Vol 31 (8) ◽  
pp. 1609-1614
Author(s):  
Ming-Feng. SHANG ◽  
◽  
Pei-Quan. DUAN ◽  
Tian-Tian. ZHAO ◽  
Wen-Chao. TANG ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Catalyst Structure ◽  
Exchange Membrane

scholarly journals Multidisciplinary Characterization of Chlorinated Solvents Contamination and In-Situ Remediation with the Use of the Direct Current Resistivity and Time-Domain Induced Polarization Tomography

Geosciences ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 487 ◽  
Author(s):  
Aristeidis Nivorlis ◽  
Torleif Dahlin ◽  
Matteo Rossi ◽  
Nikolas Höglund ◽  
Charlotte Sparrenbom
Keyword(s):  
Direct Current ◽  
Time Domain ◽  
Chlorinated Solvents ◽  
Induced Polarization ◽  
Contaminated Sites ◽  
In Situ Remediation ◽  
Polarization Tomography ◽  
Refraction Tomography

Soil contamination is a widespread problem and action needs to be taken in order to prevent damage to the groundwater and the life around the contaminated sites. In Sweden, it is estimated that more than 80,000 sites are potentially contaminated, and therefore, there is a demand for investigations and further treatment of the soil. In this paper, we present the results from a methodology applied in a site contaminated with chlorinated solvents, for characterization of the contamination in order to plan the remediation and to follow-up the initial step of in-situ remediation in an efficient way. We utilized the results from three different methods; membrane interface probe for direct measurement of the contaminant concentrations; seismic refraction tomography for investigating the depth to the bedrock interface; and direct current resistivity and time-domain induced polarization tomography to acquire a high-resolution imaging of the electrical properties of the subsurface. The results indicate that our methodology is very promising in terms of site characterization, and furthermore, has great potential for real-time geophysical monitoring of contaminated sites in the future.

scholarly journals Correlated interfacial water transport and proton conductivity in perfluorosulfonic acid membranes

2019 ◽  
Vol 116 (18) ◽  
pp. 8715-8720 ◽  
Author(s):  
Xiao Ling ◽  
Mischa Bonn ◽  
Katrin F. Domke ◽  
Sapun H. Parekh
Keyword(s):  
Water Transport ◽  
Proton Conductivity ◽  
Proton Exchange ◽  
Interfacial Water ◽  
Total Water ◽  
Perfluorosulfonic Acid ◽  
Water Diffusivity ◽  
Perfluorosulfonic Acid Membranes ◽  
Coherent Raman

Water must be effectively transported and is also essential for maximizing proton conductivity within fuel-cell proton-exchange membranes (PEMs). Therefore, identifying relationships between PEM properties, water transport, and proton conductivity is essential for designing optimal PEMs. Here, we use coherent Raman spectroscopy to quantify real-time, in situ diffusivities of water subspecies, bulk-like and nonbulk-like (interfacial) water, in five different perfluorosulfonic acid (PFSA) PEMs. Although the PEMs were chemically diverse, water transport within them followed the same rule: Total water diffusivity could be represented by a linear combination of the bulk-like and interfacial water diffusivities. Moreover, the diffusivity of interfacial water was consistently larger than that of bulk-like water. These measurements of microscopic transport were combined with through-plane proton conductivity measurements to reveal the correlation between interfacial water transport and proton conductivity. Our results demonstrate the importance of maximizing the diffusivity and fractional contribution of interfacial water to maximize the proton conductivity in PFSA PEMs.

Cross‐borehole geoelectrical time‐lapse monitoring of in situ chemical oxidation and permeability estimation through induced polarization

2020 ◽  
Author(s):  
Thue Bording ◽  
Anders Kristian Kühl ◽  
Gianluca Fiandaca ◽  
Jørgen Fjeldsø Christensen ◽  
Anders Vest Christiansen ◽  
...  
Keyword(s):  
Time Lapse ◽  
Chemical Oxidation ◽  
Induced Polarization ◽  
In Situ Chemical Oxidation ◽  
Permeability Estimation
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