from first principles PP-I-1

PP-III-20Ni-Based Catalysts for Reforming of Methane with CO 2Damyanova S. 1 , Pawelec B. 2 , Arishtirova K. 11 Institute of Catalysis, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria2 Institute of Catalysis and Petrochemistry, CSIC, Madrid 28049, Spainsonia.damyanova@yahoo.comReforming of methane with CO 2 (dry methane reforming) for production of hydrogen orsynthesis gas has attracted academic and industrial interest because offers additionaladvantages compared to other methane reforming processes. Ni-based catalysts have beenfound to exhibit high activity in dry methane reforming, but they deactivate very fast underreaction conditions due to the sintering of the active metal phase and carbon deposition.Different approaches have been attempted to avoid carbon formation, using different kinds ofcarriers [1] or addition of a small amount of noble metal [2].Different oxides like δ,θ-Al 2 O 3 , MgAl 2 O 4 , SiO 2 -Al 2 O 3 and ZrO 2 -Al 2 O 3 were used as supportsfor Ni catalysts. The samples were characterized with different techniques: XRD, DRS, TPR,TPO and HRTEM. The effect of support composition on the structure and catalytic behaviourof Ni catalysts in dry methane reforming at 923 K was studied. It was shown that the activityof the catalysts increases in the following order: Ni/SiAl < Ni < Al Ni/ZrAl < Ni/MgAl,which is in a good correlation with carbon resistance ability of catalysts. It was concluded thatthe best catalytic properties of Ni/MgAl catalyst is due to the smallest size of metal particlesof 5.1 nm, caused by the strong interaction between Ni species and MgAl 2 O 4 support.Acknowledgment:Financial support through project No. DTK 02/36 from the National Science Fund at theMinistry of Education, Science and Youth is gratefully acknowledged.References:[1] S. Damyanova, B. Pawelec, K. Arishtirova, J.L.G. Fierro, Int. J. Hydrogen Energy 36 (2011)10635.[2] S. Damyanova, B. Pawelec, K. Arishtirova, J.L.G. Fierro, C. Sener, T. Dogu, Appl. Catal. B: Env.92 (2009) 250.171