Title of article :
CoMo catalysts supported on aluminosilicates: synergy between support and sodium effects Original Research Article
Author/Authors :
V. La Parola، نويسنده , , G Deganello، نويسنده , , A.M. Venezia، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Pages :
11
From page :
237
To page :
247
Abstract :
The structural properties and the hydrodesulfurization (HDS) activity of sodium doped and sodium free CoMo catalysts supported on amorphous aluminosilicates (ASA) were investigated as a function of different SiO2:Al2O3 ratios. The support yielding the most active catalyst, (66% alumina) doped with different amounts of sodium, was used for a series of similar catalysts in order to study the effect of the alkali ion on the catalytic performance. The supports were prepared by sol–gel method and the catalysts were prepared by incipient wet impregnation method. The structure and the surface of the various samples were investigated by X-ray diffraction (XRD), temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). The catalytic behaviour was tested in the hydrodesulfurization of thiophene carried out in a continuous flow system at atmospheric pressure, in a range of temperature between 603 and 633 K. Changes of activity with the support composition were observed. The presence of sodium, modifying the Brønsted acidity of the supports, enhances such effect. Moreover, the increase of the activity with increasing amount of sodium was a clear indication of the promoting effect of the alkali ion.
Keywords :
HDS of thiophene , Sodium effect , XRD , TPR , XPS , Sol–gel aluminosilicates , Co-Mo catalysts , Silica/alumina ratio
Journal title :
Applied Catalysis A:General
Serial Year :
2004
Journal title :
Applied Catalysis A:General
Record number :
1151307
Link To Document :
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