abstracts - Институт катализа им. Г.К. Борескова

OP-I-34STRONG METAL-SUPPORT INTERACTION IN THE NICKEL-CONTAININGPHYLLOALUMOSILICATE CATALYSTSKhassin A.A., Yurieva T.M., Kustova G.N., Minyukova T.P., Plyasova L.M.,Zaikovskii V.I., Kaichev V.V., Bukhtiyarov V.I., Anufrienko V.F., Parmon V.N.Boreskov Institute of Catalysis SB RAS, Novosibirsk, RussiaE-mail: aakhassin@catalysis.ruSynthetic TO (1 tetrahedron layer : 1 octahedral layer) phylloaluminosilicates of Ni-Mg-Al with amesite (septechlorite) structure were synthesized and characterized. The evolution ofthe structure of Ni-Mg-Al-Si amesite system was studied during its treatment in the inert andreductive media regarding their potential application as precursors of catalysts, e.g., formethane steam reforming. The amesite-like structure was shown to transform to thepolymorphous chlorite structure upon calcination in the inert gas flow at 600-650 o C. Duringthis transformation, nickel cations formvast clusters, supposedly in the brucitelikelayers of the chlorite structure (seeFig. 1). After reduction, the samplescomprise Ni 0 supported by chloritevermiculiteand do not contain silica,which was proved by XPS data. Theamesite-derived support is stable in theinert, reductive and H 2 O-containing mediaat 800 o C, 0.1 MPa, as well as at 650 o C inthe reaction mixture (CH 4 , CO, H 2 andwater), which contains 0.8 MPa of H 2 O.The nature of the metallic nickel Fig. 1. The schematic presentation of the amesite-like structuretransformations during its calcination in Ar flow and reductiveparticles formed during the reduction oftreatment.the Ni-Mg-chlorite-vermiculite was studied by a combination of XRD, XPS, HREM andadsorption methods. The surface of the samples was found as highly oxidized even after theirreduction at 925 K. The experimental XPS Ni2p core-level spectra are shown in Fig. 2. Theposition of the Ni2p 3/2 line at 855.4-856.2 eV, together with the prominent satellite peakslocated 6 eV above the principle lines Ni2p 3/2 and Ni2p 3/2 , clearly show that nickel mainlyexists in the Ni 2+ state both before and after the reduction (Fig. 2, curves 1-3). Only a weakshoulder at ∼853 eV may indicate the presence of metallic nickel on the surface or in the157