Support and Pretreatment Effects on the Hydrotreating Activity of SBA-15 and CMK-5 Supported Nickel Phosphide Catalysts

0393130 - ÚCHP 2014 RIV NL eng J - Článek v odborném periodiku
Korányi, T.I. - Vít, Zdeněk - Nagy, J.B.
Support and Pretreatment Effects on the Hydrotreating Activity of SBA-15 and CMK-5 Supported Nickel Phosphide Catalysts.
Catalysis Today. Roč. 130, č. 1 (2008), s. 80-85. ISSN 0920-5861. E-ISSN 1873-4308
Grant CEP: GA ČR GA104/06/0870
Výzkumný záměr: CEZ:AV0Z40720504
Klíčová slova: nickel phosphide * hydrodesulfurization * HDN of pyridine
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství
Impakt faktor: 3.004, rok: 2008

Ni2P and Ni12P5 containing catalysts were prepared by impregnation of the oxidic precursors on a SBA-15 mesoporous silica or on a CMK-5 nanoporous carbon. Three different kinds of precursors (calcined SBA, not calcined SBA and CMK) were reduced in hydrogen gas stream. X-ray diffraction (XRD) and (31)p solid-state nuclear magnetic resonance (NMR) analysis of the passivated catalysts confirmed the presence of Ni2P and Ni12P5 in all materials prepared from oxidic precursors with initial molar ratio of P/Ni = 2.0 and 0.5, respectively. A mixture of Ni12P5 and Ni2P was found in the CMK-5 supported catalyst prepared with initial molar ratio of P/Ni = 0.5. Lower HDS and higher HDN steady state reaction rate constants were shown over the SBA-15 supported phosphide catalysts than over a commercial presulfided NiMo/Al2O3 reference catalyst. The activities with low initial P excess are always higher than those with high initial P excess. The ratios of HDN over HDS activities are much higher over all phosphide catalysts than over the NiMo reference sample. Higher catalytic activities were found on the silica than on the carbon supported catalysts. The impregnated SBA- 15 supported samples were calcined or not before reduction, but it had no effect on the activities.
Trvalý link: http://hdl.handle.net/11104/0221879