Influence of thermal treatment on the catalytic activity of Cu-loaded carbons in NO reduction with NH3 and regeneration of the thermally deactivated catalysts

Li Yeh Hsu, Hsisheng Teng

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17 Citations (Scopus)

Abstract

The activity of carbon impregnated with Cu(NO3)2 in selective catalytic reduction (SCR) of NO with NH3 was examined at temperatures as low as 110-200°C. An mineral-free carbon was employed as the base catalyst in the present work. The activity of the carbon was significantly enhanced upon the impregnation. The temperature employed in the thermal treatment following the impregnation is found to be crucial in optimizing the performance of the carbon catalyst. For thermal treatment temperatures lower than 350°C, increasing the temperature would result in the decomposition of the residual nitrates and thus the increase of the activity. With further increase of the temperature, the activity decreased with the temperature, and this has been attributed to the aggregation of Cu upon thermal treatment. HNO3 treatment, which is capable of dissolving as well as re-dispersing the Cu aggregates, was found to fully regenerate the high-temperature treated carbon. The present study has demonstrated that the degree of Cu dispersion dominantly affected the activity of the Cu-loaded carbon, while the population of oxygen functional groups only gave a minor contribution to activity enhancement.

Original languageEnglish
Pages (from-to)69-76
Number of pages8
JournalApplied Catalysis B: Environmental
Volume42
Issue number1
DOIs
Publication statusPublished - 2003 Apr 15

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Catalyst activity
Carbon
regeneration
catalyst
Heat treatment
Catalysts
carbon
temperature
Temperature
Impregnation
Selective catalytic reduction
functional group
thermal treatment
Nitrates
Functional groups
Minerals
decomposition
nitrate
Thermodynamic properties
Agglomeration

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Cite this

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title = "Influence of thermal treatment on the catalytic activity of Cu-loaded carbons in NO reduction with NH3 and regeneration of the thermally deactivated catalysts",
abstract = "The activity of carbon impregnated with Cu(NO3)2 in selective catalytic reduction (SCR) of NO with NH3 was examined at temperatures as low as 110-200°C. An mineral-free carbon was employed as the base catalyst in the present work. The activity of the carbon was significantly enhanced upon the impregnation. The temperature employed in the thermal treatment following the impregnation is found to be crucial in optimizing the performance of the carbon catalyst. For thermal treatment temperatures lower than 350°C, increasing the temperature would result in the decomposition of the residual nitrates and thus the increase of the activity. With further increase of the temperature, the activity decreased with the temperature, and this has been attributed to the aggregation of Cu upon thermal treatment. HNO3 treatment, which is capable of dissolving as well as re-dispersing the Cu aggregates, was found to fully regenerate the high-temperature treated carbon. The present study has demonstrated that the degree of Cu dispersion dominantly affected the activity of the Cu-loaded carbon, while the population of oxygen functional groups only gave a minor contribution to activity enhancement.",
author = "Hsu, {Li Yeh} and Hsisheng Teng",
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T1 - Influence of thermal treatment on the catalytic activity of Cu-loaded carbons in NO reduction with NH3 and regeneration of the thermally deactivated catalysts

AU - Hsu, Li Yeh

AU - Teng, Hsisheng

PY - 2003/4/15

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N2 - The activity of carbon impregnated with Cu(NO3)2 in selective catalytic reduction (SCR) of NO with NH3 was examined at temperatures as low as 110-200°C. An mineral-free carbon was employed as the base catalyst in the present work. The activity of the carbon was significantly enhanced upon the impregnation. The temperature employed in the thermal treatment following the impregnation is found to be crucial in optimizing the performance of the carbon catalyst. For thermal treatment temperatures lower than 350°C, increasing the temperature would result in the decomposition of the residual nitrates and thus the increase of the activity. With further increase of the temperature, the activity decreased with the temperature, and this has been attributed to the aggregation of Cu upon thermal treatment. HNO3 treatment, which is capable of dissolving as well as re-dispersing the Cu aggregates, was found to fully regenerate the high-temperature treated carbon. The present study has demonstrated that the degree of Cu dispersion dominantly affected the activity of the Cu-loaded carbon, while the population of oxygen functional groups only gave a minor contribution to activity enhancement.

AB - The activity of carbon impregnated with Cu(NO3)2 in selective catalytic reduction (SCR) of NO with NH3 was examined at temperatures as low as 110-200°C. An mineral-free carbon was employed as the base catalyst in the present work. The activity of the carbon was significantly enhanced upon the impregnation. The temperature employed in the thermal treatment following the impregnation is found to be crucial in optimizing the performance of the carbon catalyst. For thermal treatment temperatures lower than 350°C, increasing the temperature would result in the decomposition of the residual nitrates and thus the increase of the activity. With further increase of the temperature, the activity decreased with the temperature, and this has been attributed to the aggregation of Cu upon thermal treatment. HNO3 treatment, which is capable of dissolving as well as re-dispersing the Cu aggregates, was found to fully regenerate the high-temperature treated carbon. The present study has demonstrated that the degree of Cu dispersion dominantly affected the activity of the Cu-loaded carbon, while the population of oxygen functional groups only gave a minor contribution to activity enhancement.

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