Deactivation of Methanation Catalyst (Ru/C) Under Supercritical Water by Deposition of Non-Volatile Organics: First Insights Into Deposition Patterns and Chemical Properties

Authors: Bjelić S, Gasser U, Alxneit I, Vogel F

Catalytic hydrothermal gasification (HTG) of organic matter over ruthenium nanoparticles supported on high surface area carbon poses the best catalytic system up to date for selective production of methane. The deactivation mechanisms of such catalysts have been partially explored focusing on sulfur poisoning and deactivation by nanoparticle sintering. Here we use small‐angle neutron scattering (SANS), transmission electron microscopy (TEM), Brunauer−Emmett−Teller (BET) together with ultrahigh‐pressure liquid chromatography coupled with hyphenated high‐resolution mass spectrometry (UHPLC‐HRMS) as an analytical strategy for investigation of catalyst’s deactivation by fouling. The obtained results shade light on the morphological and chemical characteristics of catalyst deactivation by organic fouling in supercritical water. Moreover, the washing of the partially deactivated catalyst using a mixture of organic solvents results in full activity reconstruction of the catalyst.

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