Characteristics of NOx adsorption and surface chemistry on impregnated activated carbon

Young Whan Lee, Dae Ki Choi, Jin Won Park

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Adsorption characteristics of NOx were studied with granular activated carbon (GAC) impregnated with potassium hydroxide (KOH). To confirm the selective adsorptivity of KOH-impregnated activated carbon (K-IAC) to NOx in a fixed-bed adsorption column, temperature of 303-403K, linear velocity of 10-32 cm/sec, and effect of added oxygen were observed. Using scanning electron microscopy (SEM), time of flight secondary ion mass spectrometry (ToF-SIMS), and SIMS depth profile, surface-reaction phenomena of adsorbent, caused by the KOH impregnation and NOx adsorption, were investigated. NO2 adsorbs by chemical reaction with impregnated KOH, from which NO is generated. When oxygen exists, the NO again adsorbs to NO2 with oxygen chemisorbed on the surface, which increases the adsorptivity. In the results of ToF-SIMS and SIMS depth profile, NO2- and NO3- increased at the surface distribution by forming oxide crystals of KNO2 and KNO3 due to bond formation with potassium ions. The SIMS depth profile of KO- ensured that KOH provided the selective adsorption site of NOx. In the mechanism studied, the basic character was led on K-IAC by surface basic OH- ions of KOH, oxidation rate from KNO2 to KNO3 was delayed, and adsorptivity of K-IAC to NOx was improved.

Original languageEnglish
Pages (from-to)937-956
Number of pages20
JournalSeparation Science and Technology
Volume37
Issue number4
DOIs
Publication statusPublished - 2002 Apr 9

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Secondary ion mass spectrometry
Surface chemistry
Activated carbon
Adsorption
Oxygen
Ions
Potassium hydroxide
Surface reactions
Impregnation
Adsorbents
Oxides
Potassium
Chemical reactions
Oxidation
Crystals
Scanning electron microscopy
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

Cite this

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title = "Characteristics of NOx adsorption and surface chemistry on impregnated activated carbon",
abstract = "Adsorption characteristics of NOx were studied with granular activated carbon (GAC) impregnated with potassium hydroxide (KOH). To confirm the selective adsorptivity of KOH-impregnated activated carbon (K-IAC) to NOx in a fixed-bed adsorption column, temperature of 303-403K, linear velocity of 10-32 cm/sec, and effect of added oxygen were observed. Using scanning electron microscopy (SEM), time of flight secondary ion mass spectrometry (ToF-SIMS), and SIMS depth profile, surface-reaction phenomena of adsorbent, caused by the KOH impregnation and NOx adsorption, were investigated. NO2 adsorbs by chemical reaction with impregnated KOH, from which NO is generated. When oxygen exists, the NO again adsorbs to NO2 with oxygen chemisorbed on the surface, which increases the adsorptivity. In the results of ToF-SIMS and SIMS depth profile, NO2- and NO3- increased at the surface distribution by forming oxide crystals of KNO2 and KNO3 due to bond formation with potassium ions. The SIMS depth profile of KO- ensured that KOH provided the selective adsorption site of NOx. In the mechanism studied, the basic character was led on K-IAC by surface basic OH- ions of KOH, oxidation rate from KNO2 to KNO3 was delayed, and adsorptivity of K-IAC to NOx was improved.",
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Characteristics of NOx adsorption and surface chemistry on impregnated activated carbon. / Lee, Young Whan; Choi, Dae Ki; Park, Jin Won.

In: Separation Science and Technology, Vol. 37, No. 4, 09.04.2002, p. 937-956.

Research output: Contribution to journalArticle

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AB - Adsorption characteristics of NOx were studied with granular activated carbon (GAC) impregnated with potassium hydroxide (KOH). To confirm the selective adsorptivity of KOH-impregnated activated carbon (K-IAC) to NOx in a fixed-bed adsorption column, temperature of 303-403K, linear velocity of 10-32 cm/sec, and effect of added oxygen were observed. Using scanning electron microscopy (SEM), time of flight secondary ion mass spectrometry (ToF-SIMS), and SIMS depth profile, surface-reaction phenomena of adsorbent, caused by the KOH impregnation and NOx adsorption, were investigated. NO2 adsorbs by chemical reaction with impregnated KOH, from which NO is generated. When oxygen exists, the NO again adsorbs to NO2 with oxygen chemisorbed on the surface, which increases the adsorptivity. In the results of ToF-SIMS and SIMS depth profile, NO2- and NO3- increased at the surface distribution by forming oxide crystals of KNO2 and KNO3 due to bond formation with potassium ions. The SIMS depth profile of KO- ensured that KOH provided the selective adsorption site of NOx. In the mechanism studied, the basic character was led on K-IAC by surface basic OH- ions of KOH, oxidation rate from KNO2 to KNO3 was delayed, and adsorptivity of K-IAC to NOx was improved.

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