TiO2 was treated with boron (0.05, 0.1%: boric acid source) to give B/TiO2.
CO(NO3)(2).6H(2)O(10% Co) was then added to both TiO2 and B/TiO2 (incipient
wetness) and the materials were then sulfided with 100, 200 and 500 ppm (N
H4)(2)S. The sulfided Co/TiO2 catalysts with and without boron were charact
erised by TPR and O-2 titration and evaluated for Fischer-Tropsch synthesis
. Low-level sulfur addition (100, 200 ppm S) did not significantly influenc
e the activity and selectivity of the catalysts. The addition of a higher-l
evel loading of sulfur (500 ppm S) resulted in severe sulfur poisoning of c
atalysts (80% decrease in reaction rate), but the modification of Co/TiO2 b
y boron retarded this poisoning (35% decrease in reaction rate). A shift in
the product distribution to light molecular weight hydrocarbons (alpha = 0
.32) was observed for the 500 ppm S loaded catalyst (no boron addition) whi
le boron addition retarded this shift (alpha = 0.47). The effect of boron o
n the sulfur poisoning resistance of the Co/TiO2 catalysts is discussed. (C
) 2001 Elsevier Science B.V. All rights reserved.