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- W2293239430 abstract "This thesis investigates both hydrogen combustion and production, focusing on fundamentals of Pt-catalysed oxidation and steam methane reforming on nickelbased catalysts.On the first aspect, we started reporting and investigating discrepancies on the structure and predictions of detail surface kinetic models from Literature, for H2-O2 reaction on Pt. Quantitative comparisons have been carried out through a closed-vessel, well-stirred reactor model with catalytic internal surface. Discrepancies in the predictions of the microkinetic models apparently comes from disagreement in the experimental date they are based on. Differences in experimental set-ups and Pt surface structure prompted us to develop own data, using plane Pt surface in suitable reactors. A novel laboratory reactor to investigate hydrogen oxidation on Pt surfaces has been designed, based on modelling, and built.Experimental catalytic activity test proved that Pt activity can vary dramatically. Catalyst pretreatments with H2 and O2 revealed the mechanism of competition for surface sites as well as restructuring of the surface. Significantly long transformation was measured, particularly after catalyst O2 pretreatment, that are not included in the elementary chemistry models from Literature. Reaction lightoff at H2 lean compositions have been measured and compared with Literature experimental data, providing explanations for the differences among published data.Subsequently, transient simulation of hydrogen combustion in platinumcoated channel has been adopted to evaluate the behavior under heterogeneous and hetero-/homogeneous chemistries. Effects of catalyst support material properties, FeCr-alloy and cordierite, have been compared. Implication for the operation of various practical catalytic reactors are finally drawn.Concerning H2 production, we investigated the catalytic reforming of natural gas, by steam, both theoretically and experimentally. We identified relevant ranges of operative variables to study the catalyst at industrially relevant conditions. We designed by scaling down from industrial plants an original set-up to investigate the reaction kinetics at high-pressure (10 bars). We compared three nickel-based catalysts at low steam-to-carbon conditions, approaching S/C = 1, to collect activity and coking data for validation and development of detailed surface chemistry model." @default.
- W2293239430 created "2016-06-24" @default.
- W2293239430 creator A5018771926 @default.
- W2293239430 date "2015-02-02" @default.
- W2293239430 modified "2023-09-27" @default.
- W2293239430 title "Modelling and experimental investigation of microkinetic in heterogeneous catalysis: hydrogen combustion and production" @default.
- W2293239430 hasPublicationYear "2015" @default.
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