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12. Multifunctional Nanoparticle Applications to Microalgal Biorefinery

Author

Seo, Jung Yoon, Kim, Minjeong G., Lee, Kyubock, Lee, Young-Chul, Na, Jeong-Geol, Jeon, Sang Goo, Park, Seung Bin, Oh, You-Kwan, He, Liang-Nian, Series editor, Rogers, Robin D., Series editor, Su, Dangsheng, Series editor, Tundo, Pietro, Series editor, Zhang, Z. Conrad, Series editor, Rai, Mahendra, editor, and da Silva, Silvio Silvério, editor

Published
2017
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28. The effect of CNTs on V-Ce/TiO2 for low-temperature selective catalytic reduction of NO.

Author

Youn, Jae-Rang, Kim, Min-Jae, Lee, Seung-Jae, Ryu, In-Soo, Jeong, Soon Kwan, Lee, Kyubock, and Jeon, Sang Goo

Abstract

Carbon nanotubes (CNTs) are widely utilized as catalyst promoters because of their unique structure and electrical properties. In this study, CNTs were added as a promoter to V-Ce/TiO2 (VCT), which is a commercial catalyst used for the NH3-SCR reaction. We investigated the role of CNTs in the V-Ce/TiO2-CNTs (VCTC) catalyst. Therefore, we characterized them using X-ray diffraction (XRD), N2 adsorption/desorption experiments, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), temperature-programmed reduction of H2 (H2-TPR), temperature-programmed desorption of NO/NH3 (NO/NH3-TPD), X-ray photoelectron spectroscopy (XPS), and in situ Fourier transform infrared spectroscopy (FT-IR). Higher NO conversion and N2 selectivity were achieved in the VCTC catalyst than in the VCT catalyst, confirming the favorable effect of CNTs on the NH3-SCR reaction. Additionally, CNTs considerably influenced the crystal structure formation of the metal oxides located on the catalyst surface. Consequently, metal-metal and metal-support undergo distinct interactions, thereby positively influencing catalytic characteristics such as redox properties, oxidation state, acid sites, and the formation of nitrate species. [ABSTRACT FROM AUTHOR]

Published
2022
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40. Simultaneous catalytic reduction of N2O and NOx for tertiary N2O abatement technology: A field study in a nitric acid production plant.

Author

Lee, Seung‐Jae, Ryu, In‐Soo, Jeon, Sang‐Goo, and Moon, Seung‐Hyun

Subjects
CATALYTIC reduction, NITROGEN oxides, NITROUS oxide, ABATEMENT (Atmospheric chemistry), AIR pollution prevention, NITRIC acid, CHEMICAL plants & the environment, CHEMICAL reactors
Abstract

To investigate the feasibility of the simultaneous abatement of N2O and NOx in a single reactor, this field study was performed in a nitric acid production plant. An Fe/BEA powder catalyst prepared by Fe ion‐exchange with steam‐treated BEA zeolite was extruded in pellets and honeycombs. In the simultaneous reduction of N2O and NOx, the pellet‐ and honeycomb‐type catalysts showed more than a 90% and 95% conversion of N2O and NOx, respectively, at a reaction temperature between 350 °C and 380 °C which is typical for the DeNOx process. The catalytic performance of the pellets and honeycombs was also stable during the reactor operation period. With higher N2O and NOx conversions of over 90%, NH3 concentration in exhaust gas streams can be reduced to satisfy domestic regulations for air pollutant emissions. Accordingly, it is suggested that the simultaneous reduction of N2O and NOx in a single reactor with the Fe/BEA catalyst may be a reasonable option for a tertiary abatement technology for nitric acid production plants. Novelty or Significance: The simultaneous catalytic reduction of N2O and NOx in a tail gas from a nitric acid production plant was investigated with Fe/BEA catalysts prepared by Fe ion‐exchange with steam‐treated BEA zeolite. Pellet‐ and honeycomb‐type catalysts were applied to abatement using NH3 as the reducing agent. Over 90% of N2O and NOx from the nitric acid production process was simultaneously removed from a single reactor at a reaction temperature between 350 °C and 380 °C. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 451–456, 2019 [ABSTRACT FROM AUTHOR]

Published
2019
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