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14. Carbon Materials Application in Heterogeneous Catalysis for Water Treatment: A Pathway to Process Intensification.

Author

Santos, Ana Sofia G. G., Orge, Carla A., Pereira, Manuel Fernando R., and Soares, Olívia Salomé G. P.

Subjects
*WATER reuse, *CARBON-based materials, *WATER purification, *HETEROGENEOUS catalysis, *COMPLEX matrices
Abstract

Over the past few years, heterogeneous catalysis has been recognized as a versatile and efficient approach for applications in environmental remediation systems. The water treatment field is one of the most prominent beneficiaries of these various catalytic processes due to the crucial need to promote water reuse. However, there are still shortcomings related to the efficiency of these processes when applied to increasingly complex water matrices composed of different classes of contaminants. The present review aims to address the advantages associated with the application of catalytic processes and the diverse catalysts for water treatment while exploring how to take advantage of process integration as a solution to address the challenges posed by the growing complexity of environmental matrices. [ABSTRACT FROM AUTHOR]

Published
2024
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21. Synthesis of monometallic macrostructured catalysts for bromate reduction in a continuous catalytic system.

Author

Santos, A. Sofia G. G., Restivo, João, Orge, Carla A., Pereira, M. Fernando R., and Soares, O. Salomé G. P.

Subjects
BROMATE removal (Water purification), BIMETALLIC catalysts, CATALYTIC reduction, CHEMICAL vapor deposition, CATALYSTS, CARBON nanotubes
Abstract

The last few years have seen great leaps in the use of mechano-chemically modified carbon nanotubes in catalysis. While high improvements in catalytic performance have been achieved, the nature of the technique is not compatible with typical strategies for CNT coating of macro-structured catalysts by chemical vapour deposition. Developing macro-structured catalysts is a key step towards the sustainability of multi-phase catalysis and requires a methodology for coating with mechano-chemical modified CNT metallic catalysts. Preparing water-based slurries is not straightforward due to the CNT's hydrophobicity, and the use of organic solvents is unsustainable. A novel methodology for the washcoating of macro-structures with pre-modified monometallic CNT catalysts was assessed. A compromise between surfactant use, post-coating treatment, and the catalyst activity/integrity, was achieved by solubilization of the surfactant in a isopropanol:acetone mixture. The activity of the prepared catalysts was affected by the metallic dispersion, surfactant coverage, and distribution of the palladium throughout the catalytic layer. Palladium centres in the bottommost layers were found to be unavailable for liquid phase reaction. The activity of the catalysts prepared with pre-formed carbon monometallic powders was improved by adopting a coating strategy to maximize the availability of the metallic particles near the surface of the catalytic layer. [ABSTRACT FROM AUTHOR]

Published
2023
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