Overcoming calcium catalysis during the thermal reactivation of granular activated carbon

Part II. Variation of steam-curing reactivation parameters

David W. Mazyck, Fred Scott Cannon

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In order to overcome the deleterious effects of calcium catalysis during thermal reactivation, the authors have developed a methodology for first steam-curing spent GAC at 548-748 K, and then ramping the furnace temperature to 1023-1223 K while exposing the GAC to flowing N2. In this article, the authors evaluated the influence of an array of parameters on the steam-curing plus ramped-temperature protocol that included curing time, curing temperature, ramped-to temperature and steam flow rate. Pore size distribution (PSD) measurements employed the density functional theory (DFT), and these revealed that the steam-curing time had the greatest influence on pore size distribution: increasing the steam-curing time from 15 to 60 min increased the <500 Å cumulative pore volume by ca. 10% and the 5.4 to 32 Å pore volume by ca. 12%. Several of the other process parameters exhibited only a slight effect on PSD. Furthermore, a spent GAC that first experienced the steam-curing and ramped-temperature protocol and then experienced acid washing had identical micropore volume as a spent GAC that first experienced acid washing and then experienced conventional reactivation. This confirmed that the steam-curing protocol overcame calcium catalysis and its destruction of microporosity.

Original languageEnglish (US)
Pages (from-to)241-252
Number of pages12
JournalCarbon
Volume40
Issue number3
DOIs
StatePublished - Mar 1 2002

Fingerprint

Steam
Activated carbon
Catalysis
Curing
Calcium
Pore size
Washing
Temperature
Microporosity
Acids
Hot Temperature
Density functional theory
Furnaces
Flow rate

All Science Journal Classification (ASJC) codes

  • Materials Chemistry

Cite this

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title = "Overcoming calcium catalysis during the thermal reactivation of granular activated carbon: Part II. Variation of steam-curing reactivation parameters",
abstract = "In order to overcome the deleterious effects of calcium catalysis during thermal reactivation, the authors have developed a methodology for first steam-curing spent GAC at 548-748 K, and then ramping the furnace temperature to 1023-1223 K while exposing the GAC to flowing N2. In this article, the authors evaluated the influence of an array of parameters on the steam-curing plus ramped-temperature protocol that included curing time, curing temperature, ramped-to temperature and steam flow rate. Pore size distribution (PSD) measurements employed the density functional theory (DFT), and these revealed that the steam-curing time had the greatest influence on pore size distribution: increasing the steam-curing time from 15 to 60 min increased the <500 {\AA} cumulative pore volume by ca. 10{\%} and the 5.4 to 32 {\AA} pore volume by ca. 12{\%}. Several of the other process parameters exhibited only a slight effect on PSD. Furthermore, a spent GAC that first experienced the steam-curing and ramped-temperature protocol and then experienced acid washing had identical micropore volume as a spent GAC that first experienced acid washing and then experienced conventional reactivation. This confirmed that the steam-curing protocol overcame calcium catalysis and its destruction of microporosity.",
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Overcoming calcium catalysis during the thermal reactivation of granular activated carbon : Part II. Variation of steam-curing reactivation parameters. / Mazyck, David W.; Cannon, Fred Scott.

In: Carbon, Vol. 40, No. 3, 01.03.2002, p. 241-252.

Research output: Contribution to journalArticle

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