NiMo(W)-based hydrotreatment catalysts supported on peach stones activatedcarbon

The NiMo(W) and PNiMo(W) catalysts supported on carbon obtained from peach stones were studied. The catalysts were prepared using two different impreg nation techniques: pore filling and excess of solution. Impregnating soluti ons of molybdenum or tungsten iso- and heteropolyanions were used as precur sors of the active components. The textural properties of the catalysts wer e determined, and also they were characterized by Fourier transform infrare d spectroscopy, temperature programmed reduction and scanning electron micr oscopy. Their surface acidity and their hydrodesulfurization (HDS) and hydr odenitrogenation (HDN) activities were measured. The positive influence of phosphorus on HDS and HDN activity of both molybd enum and tungsten-based catalysts was confirmed. It was found that the HDN activity depends strongly on the preparation method and on the W and Mo pre cursors used in the impregnating solution. The PNiMo and PNiW catalysts on carbon prepared by impregnation with heteropolyanions solutions were as or more active for HDN reaction than those obtained from the classical isopoly anions, (C) 1999 Elsevier Science B.V. All rights reserved.