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Title: Regeneration of field-spent activated carbon catalysts for low-temperature selective catalytic reduction of NOx with NH3

Abstract

In the process of producing liquid crystal displays (LCD), the emitted NOx is removed over an activated carbon catalyst by using selective catalytic reduction (SCR) with NH3 at low temperature. However, the catalyst rapidly deactivates primarily due to the deposition of boron discharged from the process onto the catalyst. Therefore, this study is aimed at developing an optimal regeneration process to remove boron from field-spent carbon catalysts. The spent carbon catalysts were regenerated by washing with a surfactant followed by drying and calcination. The physicochemical properties before and after the regeneration were investigated by using elemental analysis, TG/DTG (thermogravimetric/differential thermogravimetric) analysis, N2 adsorption-desorption and NH3 TPD (temperature programmed desorption). Spent carbon catalysts demonstrated a drastic decrease in DeNOx activity mainly due to heavy deposition of boron. Boron was accumulated to depths of about 50 {mu}m inside the granule surface of the activated carbons, as evidenced by cross-sectional SEM-EDX analysis. However, catalyst activity and surface area were significantly recovered by removing boron in the regeneration process, and the highest NOx conversions were obtained after washing with a non-ionic surfactant in H2O at 70 C, followed by treatment with N2 at 550 C.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1031416
Report Number(s):
PNNL-SA-84562
Journal ID: ISSN 1385-8947; 35404; VT0401000; TRN: US201201%%591
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chemical Engineering Journal
Additional Journal Information:
Journal Volume: 174; Journal Issue: 1; Journal ID: ISSN 1385-8947
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACTIVATED CARBON; BORON; CALCINATION; CARBON; CATALYSTS; DEPOSITION; DESORPTION; DRYING; LIQUID CRYSTALS; REGENERATION; SELECTIVE CATALYTIC REDUCTION; SURFACE AREA; SURFACTANTS; WASHING; selective catalytic reduction with NH3; DeNOx; activated carbon; boron; deactivation; catalyst regeneration; Environmental Molecular Sciences Laboratory

Citation Formats

Jeon, Jong Ki, Kim, Hyeonjoo, Park, Young-Kwon, Peden, Charles HF, and Kim, Do Heui. Regeneration of field-spent activated carbon catalysts for low-temperature selective catalytic reduction of NOx with NH3. United States: N. p., 2011. Web. doi:10.1016/j.cej.2011.09.011.
Jeon, Jong Ki, Kim, Hyeonjoo, Park, Young-Kwon, Peden, Charles HF, & Kim, Do Heui. Regeneration of field-spent activated carbon catalysts for low-temperature selective catalytic reduction of NOx with NH3. United States. https://doi.org/10.1016/j.cej.2011.09.011
Jeon, Jong Ki, Kim, Hyeonjoo, Park, Young-Kwon, Peden, Charles HF, and Kim, Do Heui. Sat . "Regeneration of field-spent activated carbon catalysts for low-temperature selective catalytic reduction of NOx with NH3". United States. https://doi.org/10.1016/j.cej.2011.09.011.
@article{osti_1031416,
title = {Regeneration of field-spent activated carbon catalysts for low-temperature selective catalytic reduction of NOx with NH3},
author = {Jeon, Jong Ki and Kim, Hyeonjoo and Park, Young-Kwon and Peden, Charles HF and Kim, Do Heui},
abstractNote = {In the process of producing liquid crystal displays (LCD), the emitted NOx is removed over an activated carbon catalyst by using selective catalytic reduction (SCR) with NH3 at low temperature. However, the catalyst rapidly deactivates primarily due to the deposition of boron discharged from the process onto the catalyst. Therefore, this study is aimed at developing an optimal regeneration process to remove boron from field-spent carbon catalysts. The spent carbon catalysts were regenerated by washing with a surfactant followed by drying and calcination. The physicochemical properties before and after the regeneration were investigated by using elemental analysis, TG/DTG (thermogravimetric/differential thermogravimetric) analysis, N2 adsorption-desorption and NH3 TPD (temperature programmed desorption). Spent carbon catalysts demonstrated a drastic decrease in DeNOx activity mainly due to heavy deposition of boron. Boron was accumulated to depths of about 50 {mu}m inside the granule surface of the activated carbons, as evidenced by cross-sectional SEM-EDX analysis. However, catalyst activity and surface area were significantly recovered by removing boron in the regeneration process, and the highest NOx conversions were obtained after washing with a non-ionic surfactant in H2O at 70 C, followed by treatment with N2 at 550 C.},
doi = {10.1016/j.cej.2011.09.011},
url = {https://www.osti.gov/biblio/1031416}, journal = {Chemical Engineering Journal},
issn = {1385-8947},
number = 1,
volume = 174,
place = {United States},
year = {2011},
month = {10}
}