An empirical investigation of the influence of sulfur additives on the catalytic rate of coke deposition and CO formation in the steam cracking of LPG over Incoloy 600 and stainless steel

•The influence of sulfur additives in the steam cracking of industrial LPG feedstock.•The impact of H2S on the rate of CO and coke formation over Incoloy and stainless steel.•The empirical models of the coke deposition rate and CO formation over Incoloy and stainless steel.

In the current paper, the influence of sulfur additives in the steam cracking of LPG (liquefied petroleum gas), as an industrial feedstock, has been investigated. The effect of hydrogen sulfide (H2S) and dimethyl disulfide (DMDS) on the rate of catalytic coke deposition and CO formation have been examined over Incoloy 600, and stainless steel. The impact of sulfur concentration, temperature, and residence time on the rate of catalytic coke formation over each metal, and the CO formation have been investigated using the central composite design (CCD) technique for designing the experiments. Furthermore, the empirical models of the coke deposition rate and CO formation have been proposed for Incoloy and stainless steel individually, based on the statistical analysis of the experimental results. Then, the performance of DMDS was compared with H2S at some of the selected conditions observed for the H2S addition.

Graphical abstractInfluence of H2S in comparison with DMDS on the rate of catalytic coke deposition on Incoloy.Figure optionsDownload full-size imageDownload as PowerPoint slide