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

PP-IV-6THE 5%Ni-2%Au/Al 3 CrO 6 SYSTEMS AS A CATALYSTS FOR SYNGASAND HYDROGEN PRODUCTIONT.P. Maniecki, K. Bawolak*, W.K. JóźwiakTechnical University of Lodz, 94-924, Lodz, Poland*Corresponding author: +48 42 6313103, kbawolak@p.lodz.plIntroductionThe synthesis gas and hydrogen are produced in CH 4 reforming processes. The partialoxidation of methane - POM, (CH 4 + ½ O 2 → CO + 2H 2 ) is suitable reaction to receive syngaswith molar ratio H 2 :CO = 2, which can be used as a key feedstock for many processes likeFischer-Tropsch synthesis. The hydrogen is a product of oxy-steam reforming of methane-OSR, (CH 4 + H 2 O → CO + 3H 2 ). The commercial catalysts for CH 4 reforming are usuallysupported Ni catalysts, which exhibit good catalytic activity. Unfortunately, low stability andlow resistance to carbon deposition is observed for nickel based catalysts. The supportmodification and the use of bimetallic active phase could improve catalytic performance ofcatalyst in partial oxidation of methane and steam reforming of methane.The effect of gold addition and the binary oxide support on production of syngas andhydrogen was studied in this work. The influence of reactants composition (CH 4 :O 2 :H 2 O) onhydrogen production was researched. The physicochemical properties of Al 3 CrO 6 support and5%Ni/Al 3 CrO 6 and 5%Ni-2%Au/Al 3 CrO 6 catalyst were investigated.ExperimentalThe binary Al 3 CrO 6 support was co-precipitated using appropriate mixture of solution(Cr(NO 3 ) 3 ⋅9H 2 O and Al(NO 3 ) 3 ⋅9H 2 O) and after water removal it was dried and calcined at400°C/4h/air. The supported catalysts 5%Ni/Al 3 CrO 6 and 5%Ni-2%Au/Al 3 CrO 6 wereprepared by wet impregnation method of precursors: Ni(NO 3 ) 2 ⋅6H 2 O and HAuCl 4 . Catalystswere dried and calcined at 400°C/4h/air. POM and OSR activity tests were carried out in aflow quartz reactor in the temperature range 25-950°C with GC analysis. Thephysicochemical properties were studied by BET, TPR, XRD and ToF-SIMS techniques.Results and DiscussionThe specific surface area was 93m 2 /g for Al 3 CrO 6 support, 70 m 2 /g for 5%Ni/Al 3 CrO 6 and55 m 2 /g for 5%Ni-2%Au/Al 3 CrO 6 after their calcination in air at 400°C. TPR results forsupport exhibited the presence of two kind of reducible chromium oxide species in Al 3 CrO 6network which are reduced at 250 and 320°C. The use of Al 3 CrO 6 caused the increase of406