Modulated Excitation Raman Spectroscopy of V2O5/TiO2: Selective Catalytic Reduction of NO with NH3

We report the increased level of mechanistic information that Raman spectroscopy can provide when combined with modulated excitation experimentation. A V2O5/TiO2 catalyst for the selective catalytic reduction (SCR) of NOx was subjected to periodic NH3 pulses while recording time-resolved Raman spectra simultaneously. Through phase sensitive detection, we confirmed…

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Trade-off designs of power-to-methane systems via solid-oxide electrolyzer

Solid-oxide electrolyzer based power-to-methane is promising for large-scale energy storage as well as biogas upgrading by efficiently converting intermittent renewable power and CO2 (e.g., in biogas) into synthetic methane. Either air or pure oxygen can be employed in solid oxide electrolyzers for anode sweeping and thermal management. This work investigates the optimal conceptual…

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Online Measurement of Sub-ppmv Total Sulfur in Biogas by Chemiluminescence

In order to safely use biogas in applications which are highly sulfur-sensitive, such as fuel cells or catalytic methanation processes, methods for accurate online measurement of total sulfur at sub-ppmv concentrations must be developed and validated. A method based on a sulfur chemiluminescence detector (SCD) is presented here for this purpose. Biogas-specific variations in gas composition were…

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Bioenergy Resources in Switzerland: Drivers and Projections until 2050

In the energy sector, decisions and technology implementations often necessitate a mid- to long-term perspective. Thus, reliable assessments of future resource availability are needed to support the decision-making process. In Switzerland, similarly to other countries, only a limited part of the available wet biomass feedstock is currently used for anaerobic digestion. Understanding potential future trajectories…

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Nature of Synergy between Brønsted and Lewis Acid Sites in Sn–Beta Zeolites

The role of Lewis and Brønsted acid sites and their potential synergy remains ambiguous for the production of polyoxymethylene dimethyl ethers (OME), which are suitable as a Diesel substitute. Here, this synergistic effect was investigated by using a series of beta polymorph A (BEA) zeolites with various degrees of Brønsted and Lewis acidity. Lewis acidity was introduced…

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Modelling and validation of biomass combustion in a screw burner

A combined 1D-fuel-bed and 3D-CFD model for the simulation of an innovative 35 kW screw burner has been developed and validated with experiments. The 1D-fuel-bed model is a further development of a previously presented walking column approach and accounts for the special transport conditions in a screw burner. A new reduced chemical mechanism…

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