چكيده به لاتين
In this research, Nitrogen doped Carbon Nanotube (N-CNT) as metal free nanocatalyst and Mo/N-CNT as hybrid nanocatalyst were synthesized for selective oxidation of Hydrogen Sulfide to elemental Sulfur through Chemical Vapor Deposition (CVD) and Incipient Wetness Impregnation, respectively. The variable parameter in preparing N-CNTs, was Urea to Camphor ratio which changes the Nitrogen loading of N-CNT. The FT-IR, FE-SEM, BET, CHNOS, and XRD techniques were employed for characterizing the samples. H2S reaction tests were performed in Fixed Bed Reactor at 190, 210, and 230°C with 3000 ppm H2S, 1500 ppm O2, and total flow of 200 mL/min which was diluted by Nitrogen. The results showed that for the optimum N-CNT, H2S conversion of 97, 99, and 100 and selectivity toward elemental sulfur as 89, 86, and 73% are obtained at 190, 210, and 230°C, respectively, which are considerably better than those of the pristine CNT. In following, the optimum N-CNT sample was impregnated by using 5, 10, and 15 wt.% Molybdenum which enhanced the H2S conversion up to 100%. Mo addition reduced the selectivity at 190 and 210°C and enhanced it at 230°C up to 89%. Therefore, the drawback of Carbon-based catalysts at relatively higher temperature is solved through impregnation by Molybdenum.
