Studies on metal impregnated activated carbon: Complete pore structure analysis

Tripathi, Vishal; Ramachandran, P. K.

doi:10.1016/0008-6223(82)90069-0

Cited by 12 publications

(8 citation statements)

References 5 publications

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“…Senkan and Fuller (1979) showed on the other hand that COz and Nz sor$ion capacities of Wyodak coal decreased significantly after an NaOH treatment. A more complete study by Trupathi and Ramachandran (1982) showed that the micropore structure of activated carbons was not affected by impregnating with 2.08% of copper. Higher copper concentration, however, caused a steady decrease of micropore volumes.…”

Section: Effect Of Impregnation On Pore Structurementioning

confidence: 96%

Porosity effects on catalytic char oxidation. Part I: A catalyst deposition model

Perlmutter

1985

AIChE Journal

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Six char samples generated from two coals were impregnated by solutions with different concentrations of NazC03 and/or KzCO3. The catalyst solution penetration was studied, the catalyst uptake was measured, and the effects of impregnation on the char pore structure were determined experimentally. The results indicate that the impregnated catalysts reside only on particle exteriors without significant penetration. The overall rate of reaction is therefore the combination of catalytic reaction on particle exteriors and noncatalytic reaction on the pore surfaces inside the particle. A kinetic model is presented that takes these findings into account. J. L. SU and D. D. PERLMUllER Department of Chemical EngineeringUniversity of Pennsylvania Philadelphia, PA 19104 SCOPESix char samples generated from two coals were impregnated by solutions containing different concentrations of NazC03 and/or KzCO3. The effects of catalyst impregnation on the char pore structure were examined by COz adsorption and mercury porosimetry. The catalyst uptakes were determined by atomic absorption. Pycnometry tests were also conducted to determine the degree of catalyst penetration during impregnation. Catalyzed and uncatalyzed samples were examined under a scanning electron microscope at both unreacted and partially reacted stages. The experimental results were used to formulate a kinetic model that accounts for the several findings. CONCLUSIONS AND SIGNIFICANCEThe experimental work of this study focused on the degree of catalyst solution penetration that occurs during impregnation of chars. The catalyst uptake was determined as well as the effects of impregnation on the char pore structure. The impregnating solution was found unable to penetrate into the interior pore structure of a char. The deposited catalysts resided mainly on particle exteriors without affecting the pore structure. As a consequence, rapid catalytic reaction occurs on a char's exterior surfaces, reducing particle size, while a slower noncatalytic reaction occurs simultaneously inside the pore structures. The observed reaction rate is then the combination of the contributions from catalytic and noncatalytic mechanisms.From such a physical picture a model was developed for reaction kinetics of catalytic gasification. The model produces an expectation that the enhanced reactivity would be more significant at low levels of conversion, and predicts that the overall rate would decrease to that of the noncatalytic reaction at high conversion. The contributions to the overall reaction rate of catalytic and noncatalytic steps are discussed.

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Section: Effect Of Impregnation On Pore Structurementioning

confidence: 96%

Porosity effects on catalytic char oxidation. Part I: A catalyst deposition model

Perlmutter

1985

AIChE Journal

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“…Coal-fired utility boilers have been now identified as the dominant anthropogenic source of mercury. As a result, an attempt to establish a fundamental understanding of the behavior of mercury in coal-fired power plants and to develop a cost-effective method for removing mercury from flue gases has received more attention over the past decade [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Elemental mercury vapor adsorption of copper-coated porous carbonaceous materials

Kim

Bae

Park

2012

Microporous and Mesoporous Materials

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“…Mercury emissions have attracted an increasing amount of concern due to the high toxicity, volatility, bioaccumulation in the environment and the neurological effects of mercury. According to the Global Mercury Assessment Report, coal-fired power plants are the primary source of anthropogenic emissions of mercury into the atmosphere [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A review of elemental mercury removal processing

Bae¹,

Kim²,

Park³

2011

Carbon letters

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Public concern has recently increased over the potential risk of toxic elements emitted from anthropogenic sources. Among these, mercury has drawn special attention owing to its increasing level of bioaccumulation in the environment and in the food chain, with potential risks for human health. This paper presents an overview of research related to mercury control technology and identifies areas requiring additional research and development. It critically reviews measured mercury emissions progress in the development of promising control technologies, including catalytic oxidation, sorbent injection, photochemistry oxidation, and air pollution control devices.

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Studies on metal impregnated activated carbon: Complete pore structure analysis

Cited by 12 publications

References 5 publications

Porosity effects on catalytic char oxidation. Part I: A catalyst deposition model

Porosity effects on catalytic char oxidation. Part I: A catalyst deposition model

Elemental mercury vapor adsorption of copper-coated porous carbonaceous materials

A review of elemental mercury removal processing

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