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- W2896777910 abstract "The present study is a part of an experimental microkinetic approach (EMA) of the selective reduction of NOx to N2 with NH3 in excess O2 on V2O5/WO3/TiO2 catalysts (NH3-SCR process). In the temperature range of interest for NH3-SCR (T ≥≈ 473 K) and for three TiO2-based solids (sulfated and sulfate-free TiO2 supports and a sulfated 0.7% V2O5/9% WO3/TiO2 catalyst), FTIR spectroscopy and volumetric measurements with a mass spectrometer are used to study the impacts of the NH3–H2O coadsorption on the coverages of (a) the molecularly adsorbed NH3 species and (b) the molecularly and dissociated H2O species on Lewis and Brønsted sites. Whatever the solid, it is shown that NH3 dominates the molecular coadsorption on the Lewis sites. However, this does not prevent the dissociative H2O chemisorption on a small amount of Lewis acidic sites, leading to an increase in the amount of OH groups. On the two sulfated solids, these OH groups increase the amount of adsorbed NH4+ species as compared to the NH3 adsorption equilibrium. For the sulfate-free TiO2 solid having weak Brønsted sites, the switch between the NH3 adsorption equilibrium to the NH3–H2O coadsorption equilibrium is associated to the production of a small amount of NH3 due to the displacement of NH3ads-L species by H2O dissociation (competitive adsorption). It is shown that these experimental data are consistent with an original development of a competitive Temkin model (named Temkin-C), taking into account the individual heats of adsorption of NH3 and H2O species at different coverages in the absence of competition. The EMA and Temkin-C model developed in the present study can be applied to all solids having a significant IR transmission offering a method to study the surface acidity during realistic experimental conditions (in the presence of H2O), which is of interest for different catalytic processes such as NH3-SCR and alcohol dehydration." @default.
- W2896777910 created "2018-10-26" @default.
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- W2896777910 date "2018-10-10" @default.
- W2896777910 modified "2023-10-18" @default.
- W2896777910 title "Experimental Microkinetic Approach of De-NO<sub><i>x</i></sub> by NH<sub>3</sub> on V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/TiO<sub>2</sub> Catalysts. 6. NH<sub>3</sub>–H<sub>2</sub>O Coadsorption on TiO<sub>2</sub>-Based Solids and Competitive Temkin Model" @default.
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- W2896777910 doi "https://doi.org/10.1021/acs.jpcc.8b05847" @default.
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