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Contenido archivado el 2024-04-30

Novel carbons supports for liquids phase catalysts

Objetivo



A large number of ehemieal reaetions of importance to the petrochemieal, bulchemical, fine ehemical and pharmaeeutieal industry are based upon eatalrocesses. Over 90% of all chomical conversions involves the use of a suicatalyst in one or more of the production steps. The most common processes involve the reaction between liquid and gaseous reactants in the presence of a sutable, most often a solid. catalyst. Well known reaction classes include hydgenations, hydrations and oxidations. Many of these processes are camed outtehwise in a slurry reactor with a solid catalyst, which is highly dispersed as very small particles in order to enhance the available surface area and to reduce transport limitations as much as possible The need for small catalyst particles then poses problems to the efficient operation of the process. In order to guarantee product quality, to ensure recovery of (expensive) catalyst ial and to reduce environmental effects. the catalyst needs to be removeery low levels by filtration, which is a time consuming, expensive and cumbersome process. In fact, the need to remove the catalyst from the reaetion prot sets a lower size on the size of the catalyst powder practically usable (ut 10-20 Fm). Even so the relatively long residence time in batch processes ean lead to low selectivities with additional eosts and environmental probleising from the subsequent purification steps. The batch slurry processes are also lirnited to relatively small throughput reactions. For the much larger throughput hydroprocessing reactions used in the petroleum industry continuous ration can only be achieved with trickle bed reactors using much larger (1-2m) catalyst particles. Even so the relatively small size of the particles andhe hydrodynamics of the beds usually limits the reactors to co-current operation, which can be disadvantageous, hilst the size of the particles still impose severe mass transfer constraints that limits the use of these reactors toatively slow reactions. The triekle bed reactors are also limited to oxide supports as the required physical form and macrostructure cannot be achievecurrently available carbons even though they frequently give better cataperformance. Thus, the existing three-phase processes presently in use have major disadvantages. In this project we will investigate the potential of a novel synthetic carbon catalyst system to overcome these problems. The carbonin principle be produced in a wide range of physical forrns from small (

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Coordinador

University of Bath
Aportación de la UE
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Participantes (6)

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