Effect of Ptsingle bondRe interaction on sulfur adsorption and coke deposition Original Research Article

Bimetallic reforming Ptsingle bondRe catalysts were prepared either by coimpregnation or by a surface redox reaction (catalytic reduction); this last technique allowing improvement of the Ptsingle bondRe interaction. Bimetallic catalysts prepared by catalytic reduction and activated by direct reduction are less sensitive than coimpregnated ones to hydrogen sulfide adsorption at 500°C. The coking reaction was studied in the course of cyclopentane transformation at 450°C. For non-sulfided catalysts, the deposition of coke and its fouling effect for the metallic function decrease as the Ptsingle bondRe interaction increases whatever the working pressure. After sulfidation, the deactivation of bimetallic catalysts by carbon deposition depends on both the Ptsingle bondRe interaction and the working pressure. At normal pressure, the toxicity of coke increases with the degree of Ptsingle bondRe interaction while the reverse effect is observed at high pressure (15 bar).