Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-V-13DESIGN OF PILOT REACTOR AND MONOLITHIC CATALYST FORAUTOTERMAL REFORMING OF OXYGENATESV. Sadykov a,b , N. Mezentseva a *, Z. Vostrikov a , G. Alikina a , S. Pavlova a , S. Beloshapkin c ,J.R.H. Ross c , V. Ulyanitsky da Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva, 5, Novosibirsk, 630090, Russia*Corresponding author: +7-383-3308056, mnv@catalysis.rub Novosibirsk State University, Novosibirsk, 630090, Russiac University of Limerick, Limerick, Irelandd Lavrentiev Institute of Hydrodynamics, Novosibirsk, RussiaTransformation of biofuels into syngas via selective oxidation/autothermal reforming isnow considered as one of the most important task of catalysis in the energy-related fields.However, due to a high reactivity of oxygenates a heavy coking is observed leading to thecatalyst deactivation. To deal with this phenomenon, active components comprised ofcomplex oxides with a high lattice oxygen mobility (favors efficient gasification of cokeprecursors) promoted by precious metals (responsible for oxygenates activation) aresuggested. For achieving a high performance, monolithic substrates with a good thermalconductivity could be promising for providing an efficient heat transfer from the inletexothermal zone of the reactor (where oxygen is consumed) into its rear part, whereendothermal steam and dry reforming occur. To prevent thermal cracking of oxygenates andprovide an efficient evaporation of fuel at a small overheating degree, ensure its good mixingwith steam/air, new types of evaporators/mixers are to be designed. This paper presentsresults of research aimed at addressing these problems at the pilot-scale level.As heat-conducting substrates, fechraloy foil (thickness up to 0.2 mm) and gauze (wirediameter 0.2-0.3 mm, square mesh ~ 0.5x0.5 mm) protected by corundum layer via blastdusting were used. Stacked flat and corrugated bands of foil were winded into the Arkhimedspiral (external cylinder diameter ~50 mm, length 20 mm) forming triangular channels withsizes up to 3 mm. After spark-welding of tungsten rods as electrical current inlets, this heatedmonolithic substrate was used for the evaporation of liquid fuels sprayed via a nozzle directlyinto its inlet part. Similar fechraloy substrates or discs cut from fechraloy gauzes were usedfor preparation of monolithic catalysts by washcoating with a slurry of Ln-Ce-Zr-O mixedoxides (Ce:Zr = 1:1, Ln = La, Pr, or Sm) prepared via Pechini route and ultrasonicallydispersed in water with addition of peptizers and surfactants (loading up to 10 wt.%). Preciousmetals up to 1% wt.% of Pt, Pd, Ru, ) and/or Ni (up to 10 wt. %) with respect to doped ceriazirconiaoxide were supported by incipient wetness impregnation. For preparation of pilot-192