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393 results on '"Schwank, Johannes"'

17. Log-Based Process Visualization

Author

Schwank, Johannes, Schöffel, Sebastian, Ebert, Achim, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq Z., editor, and Falcão, Christianne, editor

Published
2019
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21. Gas-Phase Photocatalytic CO2Methanation over Ru/TiO2: Effects of Pressure, Temperature, and Illumination

Author

Ortiz-Ortiz, Alondra M., Yim, Carissa S., Delgado Cornejo, Daniel O., Gayle, Andrew J., Hill, Alexander J., Vogt, Victor A., Liao, Daniel W., Coons, Thomas, Fisher, Galen B., Lenert, Andrej, Schwank, Johannes W., and Dasgupta, Neil P.

Abstract

This work examines the effects of temperature (100–150 °C), pressure (1–25 bar), and UV illumination on gas-phase photocatalytic CO2methanation over Ru/TiO2. Irradiating the catalyst enables an ∼20% decrease in operating pressure to maintain the same production rate. Furthermore, the relative light enhancement is greater at 100 °C than 150 °C─a phenomenon attributed to increased carrier recombination rates at higher temperatures. Arrhenius experiments indicate that the global activation energy (Ea) of the reaction is similar in the dark and light, suggesting that rate enhancements are determined by changes in surface coverage. To test this hypothesis, the CO2reduction mechanism is probed using in situdiffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The spectra show an increase in the relative surface coverage of the intermediate formyl group under irradiation. These findings illustrate that, within the experimental conditions explored in this study, the photoexcitation of charge carriers in the semiconductor primarily influences the surface coverage of intermediates to drive enhanced methane formation at low temperatures.

Published
2024
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23. Visualizing Uncertainty in Node-Link Diagrams - a User Study

Author

Schwank, Johannes, Schöffel, Sebastian, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, Ahram, Tareq, editor, and Falcão, Christianne, editor

Published
2018
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24. Analyzing Time-Dependent Infrastructure Optimization Based on Geographic Information System Technologies

Author

Schöffel, Sebastian, Schwank, Johannes, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, and Charytonowicz, Jerzy, editor

Published
2018
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25. Guidelines for Managing Complex Scenarios for Optimization of Infrastructure Transformations

Author

Schwank, Johannes, Schöffel, Sebastian, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, and Charytonowicz, Jerzy, editor

Published
2018
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26. A Novel Concept for a Collaborative Dashboarding Framework

Author

Schöffel, Sebastian, Weibell, Greg, Schwank, Johannes, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, and Nunes, Isabel L., editor

Published
2018
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34. Conversion of NO x over Aluminosilicate Cu-CHA Zeolite Catalysts Synthesized Free of Organic Structure-Directing Agents.

Author

Nasser, Galal A., Adamu, Haruna, Bakare, Akolade I., Sanhoob, Mohammad A., Zhao, Huawang, Yamani, Zain H., Muraza, Oki, Shafeai, Emad, and Schwank, Johannes W.

Subjects
ZEOLITE catalysts, CATALYTIC reduction, CATALYST testing, EMISSION control, NUCLEAR magnetic resonance spectroscopy, LOW temperatures, ZEOLITES
Abstract

Featured Application: Catalytic NOx emission control. Cu-CHA zeolites have proven to be effective for NOx reduction, but a drawback in using CHA zeolites is the cost associated with using expensive organic structure-directing agents. To overcome this drawback, we are reporting here the synthesis of Cu-CHA zeolite catalysts in both their NH4-form as well as K-form that do not require the use of organic structure-directing agents. After comprehensive characterization by XRF, XRD, 27Al NMR spectroscopy, FE-SEM, SEM/EDS, N2-adsorption/desorption, NH3-TPD, H2-TPR, and XPS, the zeolite catalysts were tested for NOx conversion by NH3-selective catalytic reduction (NH3-SCR). Cu-NH4-CHA zeolite catalysts exhibited remarkable activity and thermal stability over a wide temperature window, outperforming their counterpart K-forms. Among the NH4-forms of CHA zeolite catalysts, the 0.1 M Cu-NH4-CHA showed the best catalytic performance, achieving 50% NOx conversion at a temperature as low as 192 °C, and reaching full conversion of NOx at 261 °C. These Cu-based CHA zeolite catalysts are promising thanks to their environmentally friendly synthesis and offer the opportunity of maximizing DeNOx strategies in applications for NOx pollution abatement. [ABSTRACT FROM AUTHOR]

Published
2023
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