Kinetic modeling of NH3-SCR over a supported Cu zeolite catalyst using axial species distribution measurements

Auvray, X.; Partridge, William P.; Choi, Jae‐Soon; Pihl, Josh A.; Coehlo, Filipa; Yezerets, Aleksey; Kamasamudram, Krishna; Currier, Neal W.; Olsson, Louise

doi:10.1016/j.apcatb.2014.08.003

Cited by 35 publications

(9 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Otherwise, intracatalyst distributed measurements of SCR reactions enable kinetic parameters to be determined under actual operating conditions. Auvray et al 571 developed a kinetic model over honeycomb monoliths supported Cu-BEA using intracatalyst axial species distribution measurements. The spatial distribution for "Standard" SCR were modeled between 200 and 400 °C, and the resulting kinetic model provided good spatiotemporal simulation of the SCR reaction throughout the monolith catalyst system.…”

Section: Washcoated Monolith Catalystsmentioning

confidence: 99%

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

et al. 2019

View full text Add to dashboard Cite

Selective catalytic reduction with NH 3 (NH 3 −SCR) is the most efficient technology to reduce the emission of nitrogen oxides (NO x ) from coal-fired industries, diesel engines, etc. Although V 2 O 5 −WO 3 (MoO 3 )/TiO 2 and CHA structured zeolite catalysts have been utilized in commercial applications, the increasing requirements for broad working temperature window, strong SO 2 /alkali/heavy metal-resistance, and high hydrothermal stability have stimulated the development of new-type NH 3 −SCR catalysts. This review summarizes the latest SCR reaction mechanisms and emerging poisonresistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VO x , MnO x , CeO 2 , and Fe 2 O 3 to CuO based catalysts; acidic compound catalysts containing vanadate, phosphate and sulfate catalysts; ion exchanged zeolite catalysts such as Fe, Cu, Mn, etc. exchanged zeolite catalysts; monolith catalysts including extruded, washcoated, and metal-mesh/foam-based monolith catalysts. The challenges and opportunities for each type of catalysts are proposed while the effective strategies are summarized for enhancing the acidity/redox circle and poison-resistance through modification, creating novel nanostructures, exposing specific crystalline planes, constructing protective/sacrificial sites, etc. Some suggestions are given about future research directions that efforts should be made in. Hopefully, this review can bridge the gap between newly developed catalysts and practical requirements to realize their commercial applications in the near future.

show abstract

Section: Washcoated Monolith Catalystsmentioning

confidence: 99%

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

et al. 2019

View full text Add to dashboard Cite

show abstract

“…For instance, CeO x -based mesoporous silica has been used as a catalyst [10]. However, it is easily poisoned by SO 2 or alkali metals, hindering their wider practical application [11–13]. On the other hand, optimal combinations of different metal oxides can usually exhibit better SCR efficiency and thermal stability than single oxides.…”

Section: Introductionmentioning

confidence: 99%

Efficient NH3-SCR removal of NOx with highly ordered mesoporous WO3(χ)-CeO2 at low temperatures

Zhan

Zhang

et al. 2017

Applied Catalysis B: Environmental

253

129

View full text Add to dashboard Cite

To eliminate nitrogen oxides (NOx), a series of highly ordered mesoporous WO3(χ)-CeO2 nanomaterials (χ represents the mole ratio of W/Ce) were synthesized by using KIT-6 as a hard template, which was used for selective catalytic reduction (SCR) to remove NOx with NH3 at low temperatures. Moreover, the nanomaterials were characterized by TEM, XRD, Raman, XPS, BET, H2-TPR, NH3-TPD and in situ DRIFTS. It can be found that all of the prepared mesoporous WO3(χ)-CeO2 (χ = 0, 0.5, 0.75, 1 and 1.25) showed highly ordered mesoporous channels. Furthermore, mesoporous WO3(1)-CeO2 exhibited the best removal efficiency of NOx, and its NOx conversion ratio could reach 100% from 225 ° C to 350 ° C with a gas hourly space velocity of 30 000 h−1, which was due to higher Ce3+ concentrations, abundant active surface oxygen species and Lewis acid sites based on XPS, H2-TPR, NH3-TPD and in situ DRIFTS. In addition, several key performance parameters of mesoporous WO3(1)-CeO2, such as superior water resistance, better alkali metal resistance, higher thermal stability and N2 selectivity, were systematically studied, indicating that the synthesized mesoporous WO3(1)-CeO2 has great potential for industrial applications.

show abstract

“…Because this model can identify the high transport coefficients from the liquid phase. The result can explain the homogenous distribution temperature in the system, concentration particle value and fluid properties in the UWS droplet [9]. The variation model in UWS concentration droplet's can be evaluated by Equation 9:…”

Section: ) Thermolysis and Evaporation Of Uws Dropletsmentioning

confidence: 99%

“…The effects of wall impingement on deposit formation in diesel SCR system has been investigated the wall temperature (338 K) and (573 K). In the previous research carried out by Auvray [9], it was shown the temperature (473 K) and (598 K) can be used to analyze kinetic modelling on NH 3 in the SCR system.…”

Section: Introductionmentioning

confidence: 99%

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

Wardana

2020

J. Mechatron. Electr. Power Veh. Technol.

View full text Add to dashboard Cite

Diesel engines are commonly used for public transportation on-road and off-road applications. Growth production of the diesel engine is very significant from year to year. Nitride Oxide (NOx) from diesel engine was one of the major sources of air pollution. Selective Catalytic Reduction (SCR) has been successfully used to reduce NOx from a diesel engine with a chemical reaction from ammonia (NH3). The mixing reaction between NOx and NH3 reaction can produce steam (H2O) and Nitrogen (N2). However, ammonia uniformity pattern usually not homogenization and the ammonia was difficult to mix with NOx. The constant air flows incomplete to assist the spray injector to spread NH3 to all corners of SCR. The impact study of turbulent phenomena and standard k-epsilon Low-Reynolds Number model to the mixing process in the SCR system using STARCCM+. The simulation studies are conducted under different pressure (4 to 6 bars), the injection rate (0.04 g/s) and temperature (338 K – 553 K) and the high pressure and high velocity magnitude creating turbulent swirl flow. The ammonia decomposition process and mixing process with NOx were investigated using a box with optical access. The simulation and numerical study results validated using back pressure value and the distribution of NOx concentration value from the catalyst outlet. The wall temperature will increase the urea evaporation to generate ammonia and gas pressure will increase the mixing process and chemical process in the SCR system. These reactions enable to optimize the SCR system technology which eventually able to reduce the NOx quantity from a diesel engine.

show abstract

Kinetic modeling of NH3-SCR over a supported Cu zeolite catalyst using axial species distribution measurements

Cited by 35 publications

References 36 publications

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

Efficient NH3-SCR removal of NOx with highly ordered mesoporous WO3(χ)-CeO2 at low temperatures

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

Contact Info

Product

Resources

About

Kinetic modeling of NH3-SCR over a supported Cu zeolite catalyst using axial species distribution measurements

Cited by 35 publications

References 36 publications

Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects

Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects

Efficient NH3-SCR removal of NOx with highly ordered mesoporous WO3(χ)-CeO2 at low temperatures

A study effects of injection pressure and wall temperature on the mixing process of NOx and NH3 in Selective Catalytic Reduction system

Contact Info

Product

Resources

About

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects

Selective Catalytic Reduction of NO_x with NH₃ by Using Novel Catalysts: State of the Art and Future Prospects