Deuterium tracer studies on hydrotreating catalysts. 3. Influence of nickel on the rates of H2–D3 and H2S–D2 isotopic exchange

The H–D isotopic exchange between H2 and D2 and between H2S and D2 was carried out at 80°C in a recycling reactor over a series of presulfided Mo/Al2O2 catalysts containing different amounts of nickel. Whatever the pretreatment procedure, it was found that the promoter had no significant effect on the rate of H–D exchange or on the amount of exchangeable hydrogen present on the catalysts.