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Fluidization for Energy, CVD and New Materials

Contact : Mehrdji HEMATI

Fluidization and processes to produce high-performance eco-responsible solid materials

- The research is carried out along four main lines:

  • Hydrodynamics and transfer in gas-solid reactors/heat exchangers
  • Shaping and surface finishing
  • Processes for the production of materials
  • Chemical reaction engineering in fluidized bed

A collaborative program of research and development

- Energy and environment

  • In the field of energy and environment, the studies focused on:
    • Gasification of biomass in a circulating fluidized bed reactor: production of gaseous biofuel (Gaya project, coordinator GDF-Suez, funding: Ademe and the European Community, PhDs: M. Detournay 2012, S. Pecate and M. Morin started in 2014, Post-Doc: X. Nitch 2013).
    • Storage of concentrated solar energy: new solar receiver using a dense particle suspension (1 shared patent between PROMES (Odeillo) and INPT-LGC in 2010 [1], funding: CNRS Energy Program, PARTISUN Project and CSP2 European Project, PhD: B. Boissière).
    • Energy optimization of drying operations in the production line for powdered PVC
      (collaboration with INEOS, PhD: A. Aubin 2014).
    • Transport by hyper-dense phase fluidization of powdered materials (2 patents, collaboration with Rio Tinto Alcan, PhD: G. Turzo 2013).
    • New process of decarbonation in circulating fluidized bed: innovating process for the concentration of CO2 in a cement plant (1 common patent between INPT and Lafarge [2], collaboration with Lafarge, PhD: S. Wahl started in 2014).
    • Recycling of building materials, in particular, concrete from demolitions (COFRAGE project funded by ANR-Ecotech 2009; PhD: N. Lippiatt 2013).

Gasification of biomass in a circulating fluidized bed (GAYA project).

- New materials

  • Research on new materials is focused on:
    • Micro-encapsulation of vitamins (2 patents, collaboration with DSM, PhD: F. Laboulfie 2013),
    • New dry process for the production of micronic or nanometric particles (PhD: R. Lakhal started in 2012).
    • Fluidized bed CVD process enabling powders to be coated with various materials.
  • Among the different topics considered we can mention:
    • Nucleation/growth phenomena on silicon nano-particles deposited on carbon nanotubes to produce anode materials for Li-ion batteries in collaboration with CEMES (PhD: N. Coppey 2013).
    • Deposition of metals on carbon nanotubes for the production of conducting fillers for polymer composites in the development of innovative multi-functional materials (FUI project in collaboration with Safran, EADS, Airbus, … and LGP/ENIT, PhD: P. Lassègue started in 2013).
    • Deposition of a silicon barrier coating on very dense tungsten powders, simulating nuclear fuel (collaboration with CEA Cadarache, PhD: F. Vanni to be defended in 2015).

New solar receiver using a dense particle suspension (CSP2 European Project).

  • CVD on flat substrates concerning :
    • The synthesis by catalytic CVD of graphene on copper foil and nickel foam [3], for applications such as OLED and Li-ion battery electrodes (European project FP7-NMP- 2009-Small called GRENADA: Graphene for Nanoscaled Applications, supported by CEA/Leti, PhD: P. Trinsoutrot 2014). This work is being pursued by studying other catalysts and for other applications, in particular micro-sensors (collaboration with LAAS and the electrochemical sensors group of LGC; FERMAT post doc of L. Assaud in 2015).
    • The development of a CVD reactor for the deposition of an alumina barrier layer on complex substrates (collaboration with CIRIMAT and Saint Gobain Desjonquères, PhD: P.L. Etcheparre 2015). This theme is also part of a RTRA STAE project (Réseau Thématique de Recherche Avancée en Science et Technologie pour l’Aéronautique et l’Espace) in Toulouse, called VIMA (Ageing of Advanced Materials).

Catalytic CVD of graphene: – (a) the CVD reactor for graphene synthesis – (b) flakes of single-layered graphene deposited on copper – (c) network of 3D multilayer graphene deposited on nickel foam.