Abstract
Catalysts consisting of highly dispersed copper on a mesoporous ZrO2 support were synthesised via a one-pot sol-gel synthesis and were tested for the selective catalytic reduction of NOx by NH3. The copper dispersion was investigated by XRD and TEM, which showed no discernible copper oxide particles up to 6 wt% Cu, while they were detected at 15 wt% Cu.NH3 adsorption and the SCR reaction were followed in situ by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) on mesoporous ZrO2 and on one-pot synthesized 3 wt% Cu/ZrO2. Cu was found to improve the NH3 adsorption capacity of the catalyst by enhancing the Lewis functionality.The catalysts were efficient for SCR at low temperature, at 150 °C 75% of NO was converted over 6 wt% Cu/ZrO2 at water-free conditions. Increasing the copper loading while maintaining the dispersion improved NOx conversion.
Highlights
Nitrogen oxides (NO and NO2, abbreviated: NOx) are gases that can have a harmful effect on both health and environment when released in the atmosphere
The one-step sol-gel synthesis procedure resulted in a mesoporous material with highly dispersed copper oxide
X-ray diffraction (XRD) did not show any copper oxide crystallites up to 6% loading, while CuO was apparent at 15% loading
Summary
Nitrogen oxides (NO and NO2, abbreviated: NOx) are gases that can have a harmful effect on both health and environment when released in the atmosphere. Combustion processes in transportation and industry are substantial sources of NOx, where they are produced in a gas phase reaction between N2 and O2 at high temperature. NOx-gen eration is not directly dependent on the combustion fuel, but is deter mined by operating conditions such as the air-to-fuel ratio and temperature of the combustion process [1]. Emissions of NOx have a particular effect on the overall air quality of densely populated areas and urban centers, as there are many small sources, such as cars, trucks and ships, that contribute to a substantial amount of the overall emissions. It is important to efficiently limit the NOx-emissions close to the source for both stationary and mobile emitters. Selective Catalytic Reduction (SCR) is an important method for reducing NOx emissions in stationary and mobile applications. The SCR process is based on three main reactions, commonly referred to as standard SCR (1), fast SCR (2) and NO2-SCR (3) [2]
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