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PublicationMicroporous and Mesoporous Materials
Year2012
Volume154
Pages87-92
International

Design of activated carbon–clay composites for effluent decontamination.

Authors:
Groups of research:Applied Biocatalysis
Adsorption offers an efficient technology for removing volatile organic compounds (VOCs) from air pollution sources. Often activated carbons (ACs) are employed owing to their large specific surface areas, high micropore volumes, rapid adsorption capabilities and selectivity towards organic molecules compared to water vapour or air. However, when large volumes of gas are to be treated pressure drop limitations may arise from the use of conventional powder adsorption beds. For these applications conformation of the activated carbon as open channel honeycomb monoliths can take advantage of the almost null pressure drop caused by these structures. Similarly, conformation as extrudates or tubes although increasing the pressure drop due to the turbulent gas flow can improve any diffusion limitations that the open channel monoliths can suffer. Conformation of the AC as a ceramic composite also improves the handling characteristics. By the use of a silicate clay binder a commercially available AC, was conformed in three different monolithic geometries; changing the channel width and the wall thicknesses and as solid extrudates and tubes. The textural and mechanical properties of these conformed composite structures were determined and the results analysed along with their dynamic adsorption capacities towards toluene at 30 C, used as a probe molecule to establish criteria by which the most suitable structure for industrial use could be selected. 
Keywords:Activated carbon, Gas purification, Ceramic composites, VOCs
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