Abstract
A major barrier in the commercialization of biomass or waste gasification into bio-syngas is the presence of impurities such as NH3, HCl, tars and alkali in the products, being detrimental to downstream processes like the conversion of bio-syngas to substitute natural gas. The exact role and effects of these biomass-derived impurities on methanation catalysts are not clearly documented, especially when poisoning factors can combine with structural aging processes such as metal sintering under operating conditions. In order to unravel these aging phenomena under methanation conditions, the direct observation of Steady-State Isotopic Transient Kinetic Analysis curves semi-log transforms is combined with their modeling in view to evaluate the efficiency and sensitivity of this transient kinetic analysis. Thus, the toxicity of acetonitrile, trichloroethylene and toluene as representative of N-, Cl-, C- based poisons respectively, is shown to be strongly linked to the metal dispersion for the studied case of alumina supported nickel catalysts. A rationale linking such a transient kinetic analysis to methanation mechanisms is proposed in the present paper.
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