Operando sulfur speciation during sulfur poisoning-regeneration of Ru/SiO₂ and Ru/Al₂O₃ using non-resonant sulfur Kα_1,2 emission.

ABSTRACT: A periodic oxidative regeneration of a sulfur-poisoned methanation catalyst is an alternative to the expensive state-of-the-art process of syngas cleaning using wet scrubbers. Here we have employed operando X-ray emission spectroscopy (XES) to study sulfur speciation on Ru/SiO₂ and Ru/Al₂O₃ during methanation in the presence of H₂S and subsequent regeneration in dilute O₂ at 360 °C. XES allowed us to obtain semi-quantitative sulfur speciation and to monitor changes in the absolute sulfur concentration. It was established that Al₂O₃, in contrast to SiO₂, forms sulfite/sulfate species by reacting with SO₂, which is released from the poisoned Ru surface upon oxidative treatment. The conce

SUBMITTER: Kuzmenko D 

PROVIDER: S-EPMC9052376 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature