III International Conference

PP-II-24STEAM METHANE REFORMING CATALYSTS BASED ON POROUS NICKELDanilova M.M., Sabirova Z.A., Kuzin N.A., Kirillov V.A., Zaikovskii V.I., Kriger T.A.Boreskov Institute of Catalysis SB RAS, Novosibirsk, RussiaE-mail: sabirova@catalysis.nsk.suGeneration of synthesis gas by methane steam reforming is a preferred catalytic method.To perform the endothermal methane steam reforming reaction it is necessary to provideintensive heat transfer from an external heat source to the reaction zone. For this reason, theobservable catalyst should possess high thermal conductivity. The application of the metalsupported catalysts is very promising.This work was aimed at elucidating the effect of synthesis conditions on the phasecomposition and texture of the porous nickel supports with MgO precoating and the supportednickel catalysts and studying the catalytic properties of the prepared catalysts in the methanesteam reforming reaction.The nickel porous plates (thickness 0.5-1 mm) prepared by rolling (S sp ∼0.1 m 2 /g,V ∑ ∼ 0.1 cm 3 /g, r prevailing 5-30 μm) were used as catalyst support.MgO support (5 wt.%) was deposited on nickel plates by impregnation with aqueoussolution of Mg(NO 3 ) 2 and subsequent drying and calcination at 550 o С in a flow of N 2(support I) or Н 2 (support II); nickel (5-9 wt.%) was deposited by impregnation withaqueous solution of Ni(NO 3 ) 2 and subsequent drying and calcination at 450 o С in N 2 . Theprepared catalysts were characterized by XRD, the nitrogen adsorption at low temperatures,mercury porosimetry and electron microscopy along with X-ray spectrum microanalysis.Catalytic activity in the methane steam reforming reaction was determined by the flowcirculatingmethod at atmospheric pressure (750° o С, Н 2 О/СН 4 =2, space velocity 11.8 l/h).The samples were reduced at 750° o C in hydrogen flow.According to XRD data, the phase of nickel is presented in metal support, whereas support Ialso contains phases of NiO and MgO with lattice parameter 4.206 Å, support II contains MgOphase with lattice parameter 4.218 Å. The reduced catalyst (7.2 wt.% Ni deposited on support II)exhibits phases of nickel and solid solution NiO in MgO (lattice parameter 4.205 Å). Accordingto the reference data, the lattice parameter of MgO is 4.211 Å.As follows from SEM data, the metal support has a corpuscular porous structure formedby round conglomerates (3-15 mkm in size) grown together in contact places; support MgOforms a porous loose covering 2-3 mkm thickness, which completely covers the pore walls.According to the nitrogen adsorption at low temperatures data MgO in support II has thin206