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

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PP-V-18patterns were recorded in a X ’ PERT PRO MPD diffractometer. FTIR spectra were obtainedwith a PERKIN-Elmer spectrometer in <strong>the</strong> region <strong>of</strong> 4000-400 cm –1 . The BET surface areaswere determined with a NOVA 2000e apparatus. The study <strong>of</strong> <strong>the</strong> reaction <strong>of</strong> methanereforming by carbon dioxide in presence <strong>of</strong> <strong>the</strong>se catalysts was carried out into a tubular «U»-shaped quartz reactor at various temperatures (400°C-700°C). The catalyst were pretreatedunder hydrogen at 650°C for 12 h. Reaction mixture in proportion CH 4 /CO 2 /Ar =(20/20/60 %), at a flow rate 20 ml/min was used.Results and DiscussionThe data obtained by chemical analysis results confirmed that <strong>the</strong> M(II)/M(III) mole ratiowas close to <strong>the</strong> intended value <strong>of</strong> 2.The XRD patterns exhibit <strong>the</strong> characteristic diffractions <strong>of</strong> hydrotalcite-like layereddouble hydroxide materials on NiAl non calcined catalyst case and no o<strong>the</strong>r crystalline phasesare present. The <strong>the</strong>rmal treatment <strong>of</strong> NiAl-T resulted in <strong>the</strong> disappearance <strong>of</strong> part <strong>of</strong> <strong>the</strong>layered structure <strong>of</strong> hydrotalcite and <strong>the</strong> formation <strong>of</strong> peaks attributed to <strong>the</strong> NiO and NiAl 2 O 4were detected.By infrared spectroscopy, in <strong>the</strong> non-calcined sample, <strong>the</strong> obtained spectra reproduce <strong>the</strong>general features <strong>of</strong>ten reported for hydrotalcites-like compounds.We have studied <strong>the</strong> reaction <strong>of</strong> dry reforming <strong>of</strong> methane by carbon dioxide in presence<strong>of</strong> <strong>the</strong> various catalysts at temperatures ranging from 400 to 700°C. At 650°C, <strong>the</strong> NiAl-Tcatalysts show significant conversions such as 41.2 %, 63.0%, 69.0% and 70.0% respectivelyon NiAl-500, NiAl-600, NiAl-700 and NiAl-800 for CH 4 conversions. The studied catalystsexhibit catalytic performances at 650 °C, which vary in <strong>the</strong> following sequence: NiAl-800 >NiAl-700 > NiAl-600 > NiAl-500.References1. Y.G. Chen, K. Tomishige, K. Yokoyama, K. Fujimoto, J. Catal., 184 (1999)479.2. D. Halliche, O. Cherifi, A. Auroux, Thermochim. Acta,434 (2005)125.3. K. Takehira, T. Shishido, D. Shoro, K. Murakami, M. Honda, T. Kawabata, K. Takaki, Catal. Comm., 5(2004) 209.491

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