Studies on H2S adsorption and carbon deposition over Mo-Ni/Al2O3 catalysts

The influence of molybdenum on the CO2 reforming of methane, simultaneous s ulphur poisoning and carbon formation over alumina-supported Ni catalysts w as studied. A series of Ni/Al2O3 catalysts modified by Mo was pre pared to enable the effect of molybdenum content on H2S adsorption and the catalytic properties of the solids to be studied. The atomic Mo/Ni ratio in such cat alysts varied in the range 0.01-1.00 while the Ni content was maintained co nstant at 3.3%. The catalysts were characterized by TPR, hydrogen adsorptio n and TEM methods. The H2S adsorption capacities of the catalysts were dete rmined at 923 K employing a mixture consisting of 50 ppm H2S in a hydrogen stream. The results obtained indicate that the Mo promoter had a very favou rable influence on the sulphur resistance of the Ni-based catalyst and led to a reduction in the rate of carbon deposition and the formation of graphi tic species over the same.