Sulfur exchange on CoMo/Al2O3 hydrodesulfurization catalyst using 35S radioisotope tracer

✍ Scribed by Toshiaki Kabe; Weihua Qian; Weiping Wang; Atsushi Ishihara

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 390 KB
• Volume: 29
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(95)00267-7

✦ Synopsis

A commercial Co-Mo/AI20 3 catalyst was labeled with the radioisotope 35S in hydrodesulfurization (HDS) of 35S-labeled dibenzothiophene (35S-DBT) in a high-pressure flow reactor at 50 kg/cm z. Then, HDS of 4-methyldibenzothiopbene (4-MDBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) or sulfur exchange of H2S were carried out on the labeled catalyst at 50 kg/cm 2 and 260-360°C. The amounts of labile sulfur participating in the reaction were determined from the radioactivity of 35S-H2S released from the 35S-labeled catalyst. In the HDS reactions, the amount of labile sulfur participating in the reaction decreased in the order: DBT > 4-MDBT > 4,6-DMDBT. In the sulfur exchange reaction with H2S, the adsorption of H2S on the catalyst reached saturation above a H2S partial pressure of 0.36 kg/cm 2. It was suggested that the release of H2S from the labile sulfur may be the rate determining step of the HDS reaction.